Source: https://patents.google.com/patent/US7391174?oq=5708422
Timestamp: 2018-05-23 06:16:05
Document Index: 419722474

Matched Legal Cases: ['Application No. 2005', 'application no. 1998', 'art 350', 'art 350', 'art 330', 'art 330', 'art 340', 'art 330', 'art 330', 'art 340', 'art 330', 'art 340', 'art 330', 'art 430', 'art 440', 'art 430']

US7391174B2 - Brushless DC motor control apparatus and control method thereof - Google Patents
Brushless DC motor control apparatus and control method thereof Download PDF
US7391174B2
US7391174B2 US11340625 US34062506A US7391174B2 US 7391174 B2 US7391174 B2 US 7391174B2 US 11340625 US11340625 US 11340625 US 34062506 A US34062506 A US 34062506A US 7391174 B2 US7391174 B2 US 7391174B2
US11340625
US20070080654A1 (en )
The invention relates to a brushless DC motor control apparatus controlling the number of revolutions of a brushless DC motor having a rotor with n poles (where n is a natural number) that rotates due to a supply current with m phases (where m is a natural number) supplied to a stator, comprising: a rotation detector part, which counts the number of revolution pulses from the brushless DC motor caused by the rotation of the rotor, a revolution requirement amount input part, which receives the number of revolutions of the brushless DC motor as input and converts it to a corresponding revolution requirement amount, a comparison part, which compares the number of revolution pulses and the revolution requirement amount, and a current controller part, which controls the supply current supplied to the brushless DC motor according to comparison results from the comparison part. The number of revolutions can be controlled through a digitalized method by detecting and counting counter electromotive forces on a sensorless type brushless DC motor or F/G pulses from a sensor type brushless DC motor.
This application claims the benefit of Korean Patent Application No. 2005-94976 filed with the Korea Industrial Property Office on Oct. 10, 2005, the disclosure of which is incorporated herein by reference.
In a published Korean patent application no. 1998-0013970, a “positioning control method of a sensorless BLDC motor” is disclosed. It relates to a BLDC motor, wherein the counter electromotive forces generated on the stator by the rotor of the motor are detected, and pulses are divided into a multiple number, as these counter electromotive forces are compared with a standard voltage. The pulses are counted to determine the accurate position of the rotor of the motor with regard to the normal position of the rotor in the motor, and corresponding control signals are outputted to provide accurate positioning control.
To achieve the foregoing objectives, an aspect of the present invention provides a brushless DC motor control apparatus and control method thereof which can control the number of revolutions using a sensorless type or a sensor type brushless DC motor.
The brushless DC motor may be a sensorless type, and the rotation detector part may count the total number of detections of counter electromotive force generated on a multiphase coil of the stator as the number of revolution pulses. Here, the revolution requirement amount may be (the number of revolutions)×(the total number of counter electromotive forces generated during one revolution of the brushless DC motor).
On the other hand, the brushless DC motor may be a sensor type, and the rotation detector part may comprise a magnetic sensor, which senses F/G pulses generated by the rotation of the rotor, and may count the total number of detections of the F/G pulses as the number of revolution pulses. Here, the revolution requirement amount may be (the number of revolutions)×(the total number of F/G pulses generated during one revolution of the brushless DC motor).
Also, the brushless DC motor may be a sensorless type, and the counting (operation d) may involve counting the total number of detections of counter electromotive force generated on a multiphase coil of the stator as the number of revolution pulses. Here, the revolution requirement amount may be (the number of revolutions)×(the total number of counter electromotive forces generated during one revolution of the brushless DC motor).
On the other hand, the brushless DC motor may be a sensor type, and the counting (operation d) may involve counting the total number of detections of the F/G pulses generated on a multiphase coil of the stator as the number of revolution pulses. Here, the revolution requirement amount may be (the number of revolutions)×(the total number of F/G pulses generated during one revolution of the brushless DC motor).
The tooth 125 u around which the U-phase coil 150 u is wound faces the N pole and the S pole once each during one revolution of the rotor 130, so that counter electromotive force is generated twice on the U-phase coil 150 u. This is also true for the V-phase coil 150 v and the W-phase coil 150 w.
Therefore, during one revolution of the rotor 130, a total of six counter electromotive forces occur on the U-phase coil 150 u, V-phase coil 150 v, and W-phase coil 150 w. In other words, the number of revolutions of the rotor 130 of the sensorless brushless DC motor 100 may be determined by first adding the numbers of counter electromotive forces generated on the U-phase coil 150 u, V-phase coil 150 v, and W-phase coil 150 w, and then dividing by 6.
The counter electromotive force detector part 350 corresponds to the rotation detector part. The counter electromotive force detector part 350 detects the counter electromotive forces generated from the sensorless type brushless DC motor 100. The counter electromotive forces occur twice respectively on the three T-shaped teeth 125 on the stator of the sensorless type brushless DC motor 100. The tooth 125 u around which the U-phase coil 150 u is wound faces the N pole and S pole of the rotor 130 once each, during one revolution of the rotor 130, so that counter electromotive force is generated twice on the U-phase coil 150 u. This is also true for the V-phase coil 150 v, and the W-phase coil 150 w.
Therefore, during one revolution of the rotor 130, a total of six counter electromotive forces occur on the U-phase coil 150 u, V-phase coil 150 v, and W-phase coil 150 w.
The counter electromotive forces generated on the U-phase coil 150 u, V-phase coil 150 v, and W-phase coil 150 w according to the movement of the N pole and S pole are generated with time intervals, and the counter electromotive forces are generated sequentially with such time intervals.
The revolution requirement amount input part 330 receives the required number of revolutions of the sensorless type brushless DC motor 100 as input from the user. With the sensorless type brushless DC motor 100 illustrated in FIG. 1, six occurrences of counter electromotive force are sensed sequentially with equal time intervals. Thus, the revolution requirement amount input part 330 receives the required number of revolutions as input and converts it to a required counter electromotive force pulse number for comparing by the comparison part 340. The required counter electromotive force pulse number is equal to (the inputted number of revolutions)×(the total number of counter electromotive forces currently sensed during one revolution of the sensorless type brushless DC motor). Other formulas may also be used.
The revolution requirement amount input part 330 receives the required number of revolutions of the sensor type brushless DC motor 200 as input from the user. With the sensor type brushless DC motor 200 illustrated in FIG. 2, one generation of F/G pulse is sensed with one revolution. Thus, the revolution requirement amount input part 330 receives the required number of revolutions as input and converts it to a required F/G pulse number for comparing by the comparison part 340. The required F/G pulse number is equal to (the inputted number of revolutions)×(the total number of F/G pulses currently sensed during one revolution of the sensor type brushless DC motor). Other formulas may also be used.
In operation S510, the revolution requirement amount input part 330 converts the inputted number of revolutions to a required counter electromotive force pulse number by a formula established according to the characteristics of the sensorless type brushless DC motor 100. The required counter electromotive force pulse number may be equal to (the inputted number of revolutions)×(the number of counter electromotive forces sensed during one revolution). Other formulas may also be used. The above conversion may be performed by a comparison part 340, to which the number of revolutions is inputted, and not the revolution requirement amount input part 330.
In operation S610, the revolution requirement amount input part 430 converts the inputted number of revolutions to a required F/G force pulse number by a formula established according to the characteristics of the sensor type brushless DC motor 200. The required F/G pulse number may be equal to (the inputted number of revolutions)×(the number of F/G pulses sensed during one revolution). Other formulas may also be used. The above conversion may be performed by a comparison part 440, to which the number of revolutions is inputted, and not the revolution requirement amount input part 430.
4. The brushless DC motor control apparatus of claim 3, wherein the revolution requirement amount is (the number of revolutions)×(the total number of counter electromotive forces generated during one revolution of the brushless DC motor).
6. The brushless DC motor control apparatus of claim 3, wherein the revolution requirement amount is (the number of revolutions)×(the total number of F/G pulses generated during one revolution of the brushless DC motor).
11. The method of claim 10, wherein the revolution requirement amount is (the number of revolutions)×(the total number of counter electromotive forces generated during one revolution of the brushless DC motor).
13. The method of claim 12, wherein the revolution requirement amount is (the number of revolutions)×(the total number of F/G pulses generated during one revolution of the brushless DC motor).
wherein the brushless DC motor performs an operation of rotating at a constant speed when the first supply current is supplied and performs an operation of stopping when the second supply current is supplied and when the number of revolution pulses is equal to the received number of revolutions.
US11340625 2005-10-10 2006-01-27 Brushless DC motor control apparatus and control method thereof Expired - Fee Related US7391174B2 (en)
KR2005-94976 2005-10-10
KR20050094976A KR100725174B1 (en) 2005-10-10 2005-10-10 Control apparatus of brushless DC motor and method for controlling it
US20070080654A1 true US20070080654A1 (en) 2007-04-12
US7391174B2 true US7391174B2 (en) 2008-06-24
US11340625 Expired - Fee Related US7391174B2 (en) 2005-10-10 2006-01-27 Brushless DC motor control apparatus and control method thereof
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Owner name: SAMSUNG ELECTRO-MECHANICS, CO., LTD., KOREA, REPUB
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SON, YEON-HO;REEL/FRAME:017840/0602