Patent Publication Number: US-2011063060-A1

Title: Magnetic apparatus and magnetic system for outputting power

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of U.S. Provisional Application No. 61/243,352, filed Sep. 17, 2009, the entirety of which is incorporated by reference herein. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a magnetic apparatus and a magnetic system including the magnetic apparatus and, in particular, to a magnetic apparatus and a magnetic system including the magnetic apparatus which can generate the mechanical torque and at least two magnetic apparatus are coupled together to sum each mechanical torque. In addition, a phase angle delay of each of the magnetic torque of the at least two magnetic apparatus is arranged to minimize a torque ripple so as to output a smooth power. 
     2. Description of the Related Art 
     There are many ways to produce renewable power such as using solar panel to collect the sunlight and convert the sunlight into power. The conventional magneto caloric effect (MCE) principle is well-known to be applied to manufacture the magnetic refrigerator which is described in the published paper “Performance of a room-temperature rotary magnetic refrigerator”, International Journal of Refrigeration 29 (2006) 1327-1331. For the magnetic cooling application, the magnetic field is chosen to change the magnetic phase of the magneto caloric effect material (MCEM) so as to cause the change of magnetic entropy of the MCEM. Therefore, the temperature of the MCEM will also be changed. The larger the magnetic moment changes, the larger cooling capacity will be achieved. 
     As shown in  FIG. 1   a  and  FIG. 1   b , a conventional magnetic refrigerator  1  mainly includes a motor  124 , a pump  108 , a rotary value  104 , a permanent magnet  120 , an iron yoke  126 , and four active magnetic regeneration (AMR) beds  122   a ,  122   b ,  122   c , and  122   d . Each AMR bed which is one kind of MCEM is composed of Gd-based alloy spheres. The motor  124  rotates with the permanent  120 . The magnetic phase of the AMR bed changes so as to result the change of magnetic entropy of the AMR bed. Therefore, the temperature of the AMR bed will also change. The pump  108  circulates the heat transfer fluid (water) and the rotary valve  104  switches the flow lines. Initially, the water is cooled as it is pumped from the hot end to the cold end of the demagnetized beds. Subsequently, the water picks up a thermal load as it passes through the cold stage, and then absorbs heat as it travels from the cold end to the hot end of the magnetized beds. The heat is given up as the water passes through the exhaust-side heat exchanger  112 . 
       FIG. 2  shows relationship curves of the magnetic field versus the magnetized scale of the Gadolinium which is one kind of magneto caloric effect material (MCEM), and the curves also show the magnetization of Gadolinium is dependent to the temperature. For the environmental protection, other method to acquire the renewable energy is necessary. The MCEM is not only suitable for the magnetic refrigeration but also for the heat-power conversion application to output the power. 
     BRIEF SUMMARY OF THE INVENTION 
     A detailed description is given in the following embodiments with reference to the accompanying drawings. 
     In one aspect of the present invention is to provide a magnetic apparatus and a magnetic system including the magnetic apparatus that can generate the mechanical torque and at least two magnetic apparatus are coupled together to sum each mechanical torque. In addition, a phase angle delay of each of the magnetic torque of the at least two magnetic apparatus is arranged to minimize a torque ripple so as to output a smooth power. Therefore, a better working condition of the magnetic device and the whole magnetic system can be selected for demonstrating a better performance. 
     To achieve the above, another aspect of the present invention discloses a magnetic apparatus for smooth power output. The magnetic apparatus includes a magnetic material, at least one heated or cooled magneto caloric effect material (MCEM), a permanent magnetic element, and at least one amount of magnetic flux or magnetic flux path. The heated or cooled magneto caloric effect material (MCEM) is disposed to the magnetic material. The permanent magnetic element is coupled to the magneto caloric effect material (MCEM). The major amount of magnetic flux or major magnetic flux path is formed and passing through the permanent magnetic element, the cooled magneto caloric effect material (MCEM), and the first portion of the magnetic material. In addition, the permanent magnetic element of the magnetic apparatus or the magnetic material of the magnetic apparatus rotates by heating or cooling the heated or cooled magneto caloric effect material, a mechanical torque is generated by the magnetic apparatus and at least two magnetic apparatus are coupled together to sum each mechanical torque. 
     In another aspect of the invention also discloses a magnetic system for smooth power output further includes at least one thermal energy switching unit and a magnetic apparatus. The magnetic apparatus has a magnetic material, at least one heated or cooled magneto caloric effect material, a permanent magnetic element, and at least one amount of magnetic flux or magnetic flux path. The heated or cooled magneto caloric effect material is disposed to the magnetic material and connected to the thermal energy switching unit. The permanent magnetic element is coupled to the magneto caloric effect material, and at least one amount of magnetic flux or magnetic flux path is formed and passing through the permanent magnetic element, the cooled magneto caloric effect material, and the magnetic material. In addition, the permanent magnetic element of the magnetic apparatus or the magnetic material of the magnetic apparatus rotates by controlling the thermal energy switching unit to heat or cool the heated or cooled magneto caloric effect material, a mechanical torque is generated by the magnetic apparatus and at least two magnetic apparatus are coupled together to sum each mechanical torque. Furthermore, a phase angle delay of each of the magnetic torque of the at least two magnetic apparatus is arranged to minimize a torque ripple so as to output a smooth power. 
     Therefore, the permanent magnetic element can rotate more smoothly to save more mechanical energy which can be turned into more power. In this way, a better working condition of the magnetic device and the whole magnetic system can be selected for demonstrating a better performance. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein: 
         FIG. 1   a  is a schematic diagram of a conventional magnetic refrigerator; 
         FIG. 1   b  is a cross sectional view of the conventional magnetic refrigerator; 
         FIG. 2  shows relationship curves of the magnetic field versus the magnetized scale of the Gadolinium; 
         FIG. 3   a  is a schematic diagram showing a top view of a heat-power conversion magnetic device and two main magnetic flux paths when the hot thermal energy is applied to the MCEM  304   a  and the cold thermal energy is applied to the MCEM  304   b  and MCEM  304   c;    
         FIG. 3   b  is a schematic diagram showing a top view of a heat-power conversion magnetic apparatus and two main magnetic flux paths when the hot thermal energy is applied to the MCEM  304   b  and the cold thermal energy is applied to the MCEM  304   c  and MCEM  304   a;    
         FIG. 3   c  is a schematic diagram showing a top view of a magnetic apparatus with two main magnetic flux paths when the hot thermal energy is applied to the MCEM  304   a  and the cold thermal energy is applied to the MCEM  304   b  and MCEM  304   c;    
         FIG. 3   d  is a schematic diagram showing a heat-power conversion magnetic apparatus with the magnetic material of the magnetic apparatus rotating by heating or cooling the heated or cooled magneto caloric effect material disposed to the magnetic material so as to generate a mechanical torque; 
         FIG. 4   a  is a side schematic view of a magnetic force generating device with a single-layer MCEM; 
         FIG. 4   b  is a side schematic view of a magnetic force generating device with a multiple-layers MCEM; 
         FIG. 4   c  shows relationship curves of the multiple-layers MCEM structure of  FIG. 4   b  versus the temperature, and it also shows the Curie temperature of each layer of the multiple-layers MCEM structure; 
         FIG. 5   a  is a schematic diagram showing a top view of a magnetic apparatus with a magnetic material, six MCEMs, and a permanent magnetic element with a yoke and four poles; 
         FIG. 5   b  is a table showing the sequence of heating and cooling the six MCEMs so as to control the rotating direction of the permanent magnetic element as shown in  FIG. 5   a;    
         FIGS. 6   a ,  6   b , and  6   c  are the temperature-versus-step diagram showing when to heat and cool the six MCEMs; 
         FIG. 7   a  is a torque-versus-step diagram showing a magnetic torque waveform generated by only one magnetic apparatus; and 
         FIG. 7   b  is a torque-versus-step diagrams showing three torque waveforms, there is a phase angle delay in the below two magnetic torque waveforms, and the above magnetic torque waveform is generated by summing the below two magnetic torque waveforms so as to reduce the magnetic torque ripple. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims. 
     The magneto caloric effect material (MCEM) is not only suitable for the magnetic refrigeration but also for the heat-power conversion application. It is an important subject to provide an acquiring renewable energy system (which is also a magnetic system in this invention) and a magnetic apparatus so as to apply the reduced magnetic torque into the magnetic system to output power efficiently. In addition, different kinds of magneto caloric effect material (MCEM) have their own Curie temperature (Tc). The magneto caloric effect material (MCEM) usually has the dramatically magnetic moment change when the temperature of the materials is changed around its Curie temperature (Tc). Such kinds of materials are perfectly suitable for heat to power conversion. 
     As shown in  FIG. 3   a , a (heat-power conversion) magnetic apparatus  3   a  includes a magnetic material  306 , a rotation axis  302 , three magneto caloric effect materials (MCEMs)  304   a ,  304   b , and  304   c , and a permanent magnetic element  300  such as a permanent magnet or a Halbach-array magnet. The three magneto caloric effect materials (MCEMs)  304   a ,  304   b , and  304   c  are disposed to the magnetic material  306 . The permanent magnetic element  300  is coupled to the magneto caloric effect materials (MCEMs)  304   a ,  304   b , and  304   c . Two major magnetic flux paths  308   a ,  308   b  are formed when the hot thermal energy is applied to the magneto caloric effect material (MCEM)  304   a  and the cold thermal energy is applied to the magneto caloric effect material (MCEM)  304   b  and magneto caloric effect material (MCEM)  304   c  The magnetic material  306  can be a high permeability magnetic material or a yoke. In addition, the magnetic material  306  is formed a circle-shaped structure in the  FIG. 3   a . However, the magnetic material  306  can also be formed as an oval-shaped structure, a rectangular-shaped structure, an annular-shaped structure, or a polygonal-shaped structure. When the hot thermal energy is applied to magneto caloric effect material (MCEM)  304   a , the magnetic moment of magneto caloric effect material (MCEM)  304   a  is changed to low magnetic moment state. In addition, when the cold thermal energy is applied to magneto caloric effect material (MCEM)  304   b  and  304   c , the magnetic moment of magneto caloric effect material (MCEM)  304   b  and  304   c  are changed to high state. Furthermore, the heated or cooled magneto caloric effect material is attached along with the magnetic material, and the permanent magnetic element is disposed in the magnetic material. The permanent magnetic element  300  has two magnetic poles, and the magnetic apparatus  3   a  has three heated or cooled magneto caloric effect materials  304   a ,  304   b  and  304   c . In addition, the permanent magnetic element  300  can also have two magnetic poles, and the magnetic apparatus  3   a  can have six heated or cooled magneto caloric effect materials (not shown in the figures). One major magnetic flux  308   b  generated by the permanent magnetic element  300  flows through magneto caloric effect material (MCEM)  304   b , magnetic material  306  and magneto caloric effect material (MCEM)  304   c  then returns to the permanent magnetic element  300 . The permanent magnetic element  300  is a permanent magnet, a permanent magnet array, or a Halbach magnet. The other major magnetic flux  308   a  generated by the permanent magnetic element  300  flows through magneto caloric effect material (MCEM)  304   b , high permeability magnetic material  306  and magneto caloric effect material (MCEM)  304   c  then return to the permanent magnetic element  300 . The (heat-power conversion) magnetic apparatus  3   a  now is in its static state and maintains the permanent magnetic element  300  in horizontal position with the lowest magnetic resistance. 
     As shown in  FIG. 3   b , the structure of the (heat-power conversion) magnetic apparatus  3   b  is the same with the (heat-power conversion) magnetic apparatus  3   a . When the hot thermal energy is applied to the magneto caloric effect material (MCEM)  304   b  and cold thermal energy is applied to magneto caloric effect material (MCEM)  304   a  and magneto caloric effect material (MCEM)  304   c , the magnetic moment of magneto caloric effect material (MCEM)  304   b  is at low level state and magnetic moment of the magneto caloric effect material (MCEM)  304   a  and  304   c  are at high level state. The magnetic pole N of the permanent magnetic element  300  will be attracted by magneto caloric effect material (MCEM)  304   a  and magnetic pole S of the permanent magnetic element  300  will be attracted by magneto caloric effect material (MCEM)  304   c . Therefore, the permanent magnetic element  300  will rotate and the mechanical torque is generated through the rotation axis  302 . If it continuously changes the heating and cooling sequence of magneto caloric effect material (MCEM)  304   a ,  304   b  and  304   c , it will produce continuous mechanical torque and the mechanical torque can be converted into power. However, the mechanical torque has greater torque ripple, and it causes the output power generated ruggedly. At least two other magnetic apparatus can be coupled together to sum each mechanical torque and a phase angle delay of each of the magnetic torque of the at least two magnetic apparatus  3   a  is arranged to minimize a torque ripple so as to output a smooth power. The phase delay is determined according to the number of the magnetic apparatus. In this embodiment, the number of the magnetic apparatus is  3 , thus the phase delay is 120 degree. Usually, the magnetic apparatus  3   a  converts a low grade of heat into a mechanical power, and the low grade of heat is below 100 degree of Centigrade. In addition, the magnetic apparatus  3   a  has the mechanical torque thus generating a mechanical power is connected to drive an electrical generator for generating electrical power. 
     Moreover, the magnetic apparatus  3   a  further includes a magnetic force generating device (not shown in the figure) disposed to heat or cool the heated or cooled magneto caloric effect material  304   a ,  304   b ,  304   c . The magnetic force generating device is designed to store sensible heat released during a cooling process and release sensible heat during a heating process. The thermal energy is generated during the cooling process and the heating process and is transferred to the magnetic force generating device. In the other way, the thermal energy is transferred from the magnetic force generating device to the heated or cooled magneto caloric effect material  304   a ,  304   b ,  304   c . Therefore, the magnetic apparatus  3   a  can utilize the thermal energy more efficiency. 
     The portion “A” in  FIG. 3   a  and  FIG. 3   b  indicates the flowing direction of magnetic flux. The major amount of magnetic flux flows in clockwise (CW) direction when the magneto caloric effect material (MCEM)  304   a  is heated ( FIG. 3   a ) and the other major magnetic flux flows in counterclockwise (CCW) direction when the magneto caloric effect material (MCEM)  304   b  is heated ( FIG. 3   b ). It is obviously, heating and cooling the magneto caloric effect materials (MCEMs)  304   a ,  304   b , and  304   c  will change the magnetic moment of the magneto caloric effect materials (MCEMs)  304   a ,  304   b , and  304   c  so as to induce the change of the amount of the magnetic flux. The magnetic apparatus  3   a  is provided according to a first preferred embodiment of the invention. 
     As shown in  FIG. 3   c , a magnetic apparatus  3   c  is provided as the second preferred magnetic apparatus embodiment of the invention. The magnetic apparatus  3   c  includes a magnetic material  306 , at least one heated or cooled magneto caloric effect material (MCEM)  304   a ,  304   b ,  304   c , and the permanent magnetic element  340 , and at least one amount of magnetic flux or magnetic flux path  328   a ,  328   b . The permanent magnetic element  340  generating at least two magnetic poles includes a first magnet  342 , a first magnetic material  344 , an exciting coil  346 , and a second magnet  348 . The first magnetic material  344  is disposed with the first magnet  342 . The exciting coil  346  surrounding the first magnetic material  344  is input with an exciting control signal. The second magnet  348  is disposed with the first magnetic material  344 . The first magnetic material  344  can also be a yoke and the exciting coil  346  is a superconductor coil. 
     In addition, the exciting coil  346  can be an electrical conductive coil or a superconductor coil, and the magnetic flux paths or the amounts of the magnetic flux  328   a ,  328   b  are changed after the exciting control signal is input to the exciting coil  346 . An exciting coil  346  is introduced and a sine wave voltage is applied to the exiting coil  346 . The applying sine wave voltage will influence the amount of the magnetic flux provided by the magnetic poles (N pole and S pole) of the first magnet  342  and the magnetic poles (N pole and S pole) of the second magnet  348 . Therefore, a magnetic flux with small amount of variation is generated. The flux variation frequency and the voltage frequency applied to exciting coil  346  are same frequency. 
     As shown in  FIG. 3   d , magnetic apparatus  3   d  for smooth power output includes a magnetic material  324 , at least one heated or cooled magneto caloric effect material  322   a ,  322   b , or  322   c , a permanent magnetic element  326 , and at least one amount of magnetic flux or magnetic flux path  330   a ,  330   b . The heated or cooled magneto caloric effect material  322   a ,  322   b , or  322   c  is disposed to the magnetic material  324 . The permanent magnetic element  326  is coupled to the magneto caloric effect material  322   a ,  322   b , or  322   c . The permanent magnetic element  326  can be a permanent magnet or a Halbach-array magnet. The amount of magnetic flux or magnetic flux path  330   a ,  330   b  is formed and passing through the permanent magnetic element  326 , the cooled magneto caloric effect material  322   b ,  322   c , and the magnetic material  324 . The magnetic material  324  of the magnetic apparatus  3   d  in the permanent magnetic element  326  rotates by heating or cooling the heated or cooled magneto caloric effect material  322   a ,  322   b , and  322   c , a mechanical torque is generated by the magnetic apparatus  3   d  and at least two other magnetic apparatus are coupled together to sum each mechanical torque. In addition, a phase angle delay of each of the magnetic torque of the at least two magnetic apparatus is arranged to minimize a torque ripple so as to output a smooth power. The magnetic apparatus  3   d  is provided according to a third preferred embodiment of the invention. 
     As shown in  FIG. 4   a , a side schematic view of a magnetic force generating device  4   a  with a single-layer magneto caloric effect material (MCEM) is demonstrated. The magnetic force generating device  4   a  includes the hot side chamber  402 , the cool side chamber  404  and the single-layer magneto caloric effect material (MCEM)  406 . The magnetic force generating device  4   a  utilizes the magneto-caloric-effect properties of certain materials, such as Gadolinium or certain alloys and forms a single-layer magneto caloric effect material (MCEM)  406 . The magnetic force generating device  4   a  also has the particularity of magnetizing when a cool fluid is filled in the cool side chamber  404  so as to cool the single-layer magneto caloric effect material (MCEM)  406 . Therefore, the amount of the magnetic flux or the magnetic flux path can be formed from the permanent magnetic element to the single-layer magneto caloric effect material (MCEM)  406 . On the contrary, the magnetic force generating device  4   a  has the particularity of demagnetizing when a heated fluid is filled in the hot side chamber  402  so as to heat up the single-layer magneto caloric effect material (MCEM)  406 . Therefore, the amount of magnetic flux or the magnetic flux path can not be formed from the permanent magnetic element to the single-layer magneto caloric effect material (MCEM)  406 . In addition, the heated or cooled magneto caloric effect material (MCEM)  406  is a single-layer magneto caloric effect material (MCEM) with a single curie temperature. 
     As shown in  FIG. 4   b  and  FIG. 4   c , a side schematic view of a magnetic force generating device  4   b  with a multiple-layer magneto caloric effect material (MCEM)  406  is demonstrated. The magnetic force generating device  4   b  includes the hot side chamber  402 , the cool side chamber  404  and the multiple-layer magneto caloric effect material (MCEM)  406  (four-layer MCEM) with a plurality of Curie temperatures (four curie temperature). Each layer of the multiple-layer magneto caloric effect material (MCEM)  406  has its own Curie temperature. For example, the layer  4062  has the Curie temperature Tc 1 , the layer  4064  has the Curie temperature Tc 2 , the layer  4066  has the Curie temperature Tc 3 , and the layer  4068  has the Curie temperature Tc 4 . The way to heat or cool the magnetic force generating device  4   b  is the same as described in the above paragraph. Therefore, it is not described here again. Each layer of the multiple-layers magneto caloric effect material (MCEM)  406  is disposed sequentially according to the single curie temperature of each layer of the multiple-layers magneto caloric effect material (MCEM)  406  (Tc 1 &gt;Tc 2 &gt;Tc 3 &gt;Tc 4 ). Pushing the working fluid of hot side chamber  402  and cool side chamber  404  back and forth, a temperature gradient is generated in the flow direction as shown in  FIG. 4   c . When the working fluid is pushed from hot side chamber  402  to cool side chamber  404 , the temperature of each layer of the multiple-layers magneto caloric effect material (MCEM)  406  is higher than its Curie temperature. When the working fluid is pushed from cool side chamber  404  to hot side chamber  402 , the temperature of each layer of the multiple-layers magneto caloric effect material (MCEM)  406  is lower than its Curie temperature. The arrows A, B, C, and D represent the four processes of  FIG. 4   c  and the arrows show the change of temperature. Back to the  FIG. 3   a - 3   d , the magneto caloric effect materials (MCEMs)  304   a ,  304   b ,  304   c ,  322   a ,  322   b , and  322   c  can be a single-layer magneto caloric effect material (MCEM) having a single curie temperature or a multiple-layers magneto caloric effect material (MCEMs) having a plurality of curie temperatures. 
     Please refer to  FIG. 5   a  and  FIG. 5   b .  FIG. 5   a  is a schematic diagram showing a top view of a magnetic apparatus  5   a  with a magnetic material  506 , six magneto caloric effect materials (MCEMs)  504   a ,  504   b ,  504   c ,  504   d ,  504   e , and  504   f , and a permanent magnetic element  500  including a yoke  550  and four magnetic poles  510 ,  520 ,  530 ,  540  according to a fourth preferred embodiment of the invention. 
       FIG. 5   b  is a table showing the sequence of heating and cooling the six magneto caloric effect materials (MCEMs) so as to control the rotating direction of the permanent magnetic element  500  as shown in  FIG. 5   a . By changing the sequence of heating and cooling of the six magneto caloric effect materials (MCEMs) according to the table, it can control the rotation direction of the permanent magnetic element  500  by fixing the rotation axis  502  of the permanent magnetic element  500  in counterclockwise direction or clockwise direction. At least two magnetic apparatus  5   a  can be coupled together to sum each mechanical torque and a phase angle delay of each of the magnetic torque of the at least two magnetic apparatus  5   a  is arranged to minimize a torque ripple so as to output a smooth power. The other characteristic of the magnetic apparatus  5   a  is similar to the magnetic apparatus  3   a  as described in the above paragraph, therefore, it is omitted here. 
       FIGS. 6   a ,  6   b , and  6   c  are the temperature-versus-step diagrams showing when to heat and cool six magneto caloric effect materials (MCEMs). To be understood, the heating and cooling waveform can be any kind of waveform, not to limit in this embodiment. The proper waveform of temperature waveform is chosen base on the torque output for different kinds of applications. For example, the temperature waveform shown in  FIG. 6   a  can deliver the maximum power and the temperature waveform shown in  FIG. 6   b  can deliver the smoother power output. If much smoother torque output is required, the temperature waveform shown in  FIG. 6   c  is preferred. 
     As shown in  FIG. 7   a , a torque-versus-step diagram showing a magnetic torque waveform  702  generated by magnetic apparatus  3   a ,  3   b ,  3   c ,  3   d  or  5   a . A large magnetic torque ripple is demonstrated in  FIG. 7   a . It causes the inner rotor (such as permanent magnetic element  300 ) of the magnetic apparatus  3   a  rotate ruggedly; therefore, the output power is generated suddenly and stops being generated then. The situation may cause damage to the magnetic apparatus  3   a ,  3   b ,  3   c ,  3   d  or  5   a.    
     As shown in  FIG. 7   b , a torque-versus-step diagrams showing three torque waveforms, there is a phase angle delay in the below two magnetic torque waveforms  702  and  704  generated respectively by two magnetic apparatus. The phase angle delay is: 
     
       
         
           
             
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     The circle angle (360 degrees) is a whole step angle (360 degrees). Therefore, there are 12 steps in  FIG. 7   b  and each of the steps is  300 . The above magnetic torque waveform  706  is generated by summing the below two magnetic torque waveforms  702  and  704  so as to reduce the magnetic torque ripple. Therefore, a smoother power can be output. In addition, each of magnetic apparatus  3   a ,  3   b ,  3   c ,  3   d  or  5   a  has the same amount of the heated or cooled magneto caloric effect material, and the permanent magnetic element so as to achieve a lower torque ripple and output a smoother power by connecting the two magnetic apparatus. Besides, each of magnetic apparatus  3   a ,  3   b ,  3   c ,  3   d  or  5   a  has the same amount of the heated or cooled magneto caloric effect material and the permanent magnetic element, and the permanent magnetic element generates two magnetic poles. 
     A magnetic system for smooth power output further includes at least one thermal energy switching unit and a magnetic apparatus (not shown in the figures). The magnetic apparatus has a magnetic material, at least one heated or cooled magneto caloric effect material, a permanent magnetic element, and at least one amount of magnetic flux or magnetic flux path. The heated or cooled magneto caloric effect material is disposed to the magnetic material and connected to the thermal energy switching unit. The permanent magnetic element is coupled to the magneto caloric effect material, and at least one amount of magnetic flux or magnetic flux path is formed and passing through the permanent magnetic element, the cooled magneto caloric effect material, and the magnetic material. In addition, the permanent magnetic element of the magnetic apparatus or the magnetic material of the magnetic apparatus rotates by controlling the thermal energy switching unit to heat or cool the heated or cooled magneto caloric effect material, a mechanical torque is generated by the magnetic apparatus and at least two magnetic apparatus are coupled together to sum each mechanical torque. Furthermore, a phase angle delay of each of the magnetic torque of the at least two magnetic apparatus is arranged to minimize a torque ripple so as to output a smooth power. The characteristic of the magnetic apparatus of the magnetic system is similar to the magnetic apparatus  3   a  as described in the above paragraph; therefore, it is omitted here. 
     In summary, the invention is to provide a magnetic apparatus and a magnetic system including the magnetic apparatus that can generate the mechanical torque and at least two magnetic apparatus are coupled together to sum each mechanical torque. In addition, a phase angle delay of each of the magnetic torque of the at least two magnetic apparatus is arranged to minimize a torque ripple so as to output a smooth power. Therefore, a better working condition of the magnetic device and the whole magnetic system can be selected for demonstrating a better performance. 
     While the invention has been described by way of example and in terms of the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.