Title:
DRIVING DEVICE FOR BRUSHLESS MOTOR, AND MOTOR USING THE SAME
Document Type and Number:
Japanese Patent JP3912190
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a driving device for brushless motor wherein a power consumption is reduced when a motor is started and high rotational accuracy is attained by PWM frequency driving during steady-state rotation, and also to provide a motor using the driving device.
SOLUTION: The driving device for brushless motor comprises a frequency switching means 60 and a pulse width modulating means 70. The frequency switching means 60 switches the carrier frequency of the pulse width modulating means 70 when the motor is started and in steady-state rotation after start-up. The carrier frequency at start of the motor is set to a value lower than that during steady-state rotation. Thus, power loss which is produced by PWM chopping when the motor is started is reduced. In addition, during steady-state rotation, high rotational accuracy is attained by driving at a sufficiently high PWM frequency.
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Inventors:
Seima Toshiaki
Tomoharu Yokouchi
Tomoharu Yokouchi
Application Number:
JP2002159234A
Publication Date:
May 09, 2007
Filing Date:
May 31, 2002
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H02P6/08; H02P1/40; H02P6/06; H02P6/17; H02P6/24; H02P7/00; H02P23/16; H02P27/06; H02P27/08; (IPC1-7): H02P6/08; H02P5/41
Domestic Patent References:
| JP5038184A | ||||
| JP9219990A | ||||
| JP2002272162A |
Attorney, Agent or Firm:
Fumio Iwahashi
Hiroki Naito
Daisuke Nagano
Hiroki Naito
Daisuke Nagano