Motor controller and image forming apparatus

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11387758
APP PUB NO 20200195181A1
SERIAL NO

16713087

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A motor controller estimates an initial position of a magnetic pole of a rotor of a brushless DC motor in an inductive sensing scheme. The motor controller controls a drive circuit to apply an AC voltage to a stator winding at a first energization angle, and subsequently to apply an AC voltage to the stator winding at a second energization angle before a residual current flowing through the stator winding returns to zero. At each energization angle, the motor controller corrects a peak value of a current in the stator winding based on the residual current detected immediately before a voltage is applied to the stator winding or at a time when voltage application to the stator winding is started. Based on the corrected peak value, the control circuit estimates the initial position of the magnetic pole of the rotor.

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Patent Owner(s)

  • KONICA MINOLTA , INC.

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Suzuki, Daichi Toyokawa, JP 53 182
Tachibana, Yuta Toyokawa, JP 29 79
Yoshikawa, Hiroyuki Toyohashi, JP 87 1053

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