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Patent Searching and Data


Title:
MOTOR DRIVE AND DRIVING METHOD THEREOF
Document Type and Number:
Japanese Patent JP2003111481
Kind Code:
A
Abstract:

To attain low vibration and noise driving, and cost reduction in a device using an inexpensive and small motor.

In this driving method of a motor drive, frequency information proportional to the rotational speed of a rotor is detected, a Hall element output signal formed out of a sinusoidal waveform is outputted by a Hall element, and a Hall amplifier output signal is developed which has the amplitude depending on an output signal level of torque obtained from the frequency information using the Hall element output signal and which is formed out of a rectangular waveform or a sinusoidal waveform. The rectangular waveform or the sinusoidal waveform of the Hall amplifier output signal is selected based on a switching signal for switching on/off control. When the rectangular waveform is selected, rectangular wave drive by pulse duration control at an electrical degree 180° is performed for a stator during the driving of the motor, or when the sinusoidal waveform is selected, sinusoidal wave driving is performed for the stator during the normal driving after startup.


Inventors:
FUSE HIROSHI
Application Number:
JP2001303436A
Publication Date:
April 11, 2003
Filing Date:
September 28, 2001
Export Citation:
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Assignee:
CANON KK
International Classes:
H02P6/06; H02P6/08; H02P6/16; H02P6/17; (IPC1-7): H02P6/16; H02P6/08
Attorney, Agent or Firm:
谷 義一 (外1名)