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1. (WO2018123426) DEVICE AND METHOD FOR ACQUIRING INFORMATION ON ROTATION OF BRUSHED DC MOTOR

Pub. No.:    WO/2018/123426    International Application No.:    PCT/JP2017/043025
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Fri Dec 01 00:59:59 CET 2017
IPC: H02P 7/29
H02P 6/08
H02P 27/08
Applicants: ALPS ELECTRIC CO., LTD.
アルプス電気株式会社
Inventors: ABE, Tsutomu
阿部 勤
MIYAKO, Ikuyasu
都 軍安
Title: DEVICE AND METHOD FOR ACQUIRING INFORMATION ON ROTATION OF BRUSHED DC MOTOR
Abstract:
Provided is a device (100) for acquiring information on the rotation of a motor (10), said device comprising a rectifier that includes a rotational angular velocity calculation unit (31) for calculating a rotational angular velocity (ω) of the motor (10) on the basis of a net voltage obtained from a voltage V between terminals of the motor (10) in which the drive voltage is PWM-controlled and a current (Im) flowing through the motor (10). The signal waveform of the net voltage is generated by pulsating or smoothing the signal waveform of the voltage (V). The net voltage may be calculated by multiplying the voltage (V) by a duty ratio.