Patent Publication Number: US-2010126703-A1

Title: Motor device with heat dissipating capability

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a motor device, more particularly to a motor device capable of dissipating heat in an efficient manner. 
     2. Description of the Related Art 
     A conventional motor device has a motor casing that defines a chamber, a stator, and a rotor. The stator is fixedly disposed in the chamber, and the rotor is rotatably disposed in the chamber. 
     However, the conventional motor device suffers overheating, which can be detrimental to proper functioning of the motor device. Therefore, there is a need for a novel construction of a motor device that can facilitate efficient heat-dissipation. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to provide a motor device that can overcome the above drawback of the prior art. 
     According to the present invention, a motor device includes a motor body and a set of heat-conducting pipes. The motor body includes a motor casing that defines a chamber, a stator that is disposed in the chamber, and a rotor that is rotatably disposed in the chamber. Each of the heat-conducting pipes has a heat-absorbing end that extends into the motor body, and a heat-dissipating end that is opposite to the heat-absorbing end and that extends outwardly of the motor body. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments with reference to the accompanying drawings, of which: 
         FIG. 1  is a schematic sectional view of the first preferred embodiment of a motor device according to the present invention; 
         FIG. 2  is a perspective view of the motor device shown in  FIG. 1 ; 
         FIG. 3  is a schematic sectional view of the first preferred embodiment to illustrate a set of heat-conducting pipes extending into a motor casing of a motor body; 
         FIG. 4  is a schematic sectional view of the first preferred embodiment to illustrate the heat-conducting pipes extending between a stator of the motor body and the motor casing; 
         FIG. 5  is a schematic sectional view of the first preferred embodiment to illustrate the heat-conducting pipes extending into the stator of the motor body; 
         FIG. 6  is a schematic side view of the second preferred embodiment of the motor device of this invention, illustrating a fan unit disposed on the motor casing; 
         FIG. 7  is a partly exploded perspective view of the third preferred embodiment of the motor device of this invention, illustrating a coolant unit disposed on the motor casing; and 
         FIG. 8  is a partly exploded perspective view of the fourth preferred embodiment of the motor device according to the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to  FIGS. 1 to 5 , the first preferred embodiment of a motor device according to the present invention includes a motor body  1 , a set of heat-conducting pipes  2 , and a plurality of heat-dissipating fins  3 . The motor body  1  includes a motor casing  11  that defines a chamber  100 , a stator  12  that is disposed in the chamber  100 , and a rotor  13  that is rotatably disposed in the chamber  100 . Each of the heat-conducting pipes  2  has a heat-absorbing end  21  that extends into the motor body  1 , and a heat-dissipating end  22  that is opposite to the heat-absorbing end  21  and that extends outwardly of the motor body  1 . The heat-dissipating fins  3  are disposed on a surface of the motor casing  11 . The heat-dissipating ends  22  of the heat-conducting pipes  2  extend between the surface of the motor casing  11  and the heat-dissipating fins  3 . In this embodiment, as shown in  FIG. 3 , the heat-absorbing ends  22  of the heat-conducting pipes  2  extend into the motor casing  11 , i.e., embedded in a casing wall of the motor casing  11 . As such, heat-dissipating efficiency of the motor device is greatly enhanced over the conventional motor device. 
     In other embodiments, the heat-absorbing ends  21  of the heat-conducting pipes  2  extend between the stator  12  and the motor casing  11 , as illustrated in  FIG. 4 . In further embodiments, the heat-absorbing ends  21  of the heat-conducting pipes  2  extend into the stator  12 , as illustrated in  FIG. 5 . 
       FIG. 6  illustrates the second preferred embodiment of the present invention. The second preferred embodiment differs from the first preferred embodiment in that the motor device further includes a fan unit  4  disposed on a surface of the motor casing  11 . The heat-dissipating ends  22  of the heat-conducting pipes  2  extend between the surface of the motor casing  11  and the fan unit  4 . The fan unit  4  is coupled co-rotatably to the rotor  13  so as to be driven rotatably thereby. 
       FIG. 7  illustrates the third preferred embodiment of the present invention. The third preferred embodiment differs from the first preferred embodiment in that the motor device includes a cooling unit  5  disposed on a surface of the motor casing  11 . The cooling unit  5  includes a base part  55  and a cover part  54 . The base part  55  has one side formed with a meandering groove  56  that serves as a coolant channel  51 . The heat-dissipating ends  22  of the heat-conducting pipes  2  extend into the cooling unit  5 . The base part  55  of the cooling unit  5  is also formed with a coolant inlet  52  and a coolant outlet  53  that are in fluid communication with the coolant channel  51 . The cover part  54  covers removably the one side of the base part  55 . In use, the heat-dissipating pipes  2  exchange heat with the coolant circulating in the coolant channel  51  so that the heat of the motor device can be efficiently dissipated. 
       FIG. 8  illustrates the fourth preferred embodiment of the present invention. In this embodiment, the coolant channel  51  is spiral. 
     While the present invention has been described in connection with what are considered the most practical and preferred embodiments, it is understood that this invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.