Motor drive control device and operation method thereof

Patent metadata

Field	Value
Publication number	US-8963455-B2
Application number	US-201313925025-A
Country	US
Kind code	B2
Filing date	Jun 24, 2013
Priority date	Jul 19, 2012
Publication date	Feb 24, 2015
Grant date	Feb 24, 2015

Abstract

When a motor drive control device is integrated in a semiconductor integrated circuit having a small chip area, calibration for improving the accuracy of detection of a counter electromotive voltage, which is for detecting the speed of a motor, is enabled. A first multiplier performs multiplication between a drive current detection signal and first gain information in a first register. A subtractor performs subtraction between a drive voltage command signal and a first multiplication result in the first multiplier. A second multiplier performs multiplication between a subtraction result in the subtractor and second gain information in a second register to generate counter electromotive voltage information as information on a second multiplication result. The drive voltage command signal in a control unit is set to a predetermined value to generate a condition which maintains the speed of the motor and a counter electromotive voltage at substantially zero.

First claim

What is claimed is:

1. A motor drive control device, comprising:
a digital control unit;
a digital/analog converter;
a driver output unit;
a drive current detection amplifier;
an analog/digital converter; and
a counter electromotive voltage detection unit,
wherein, to an output terminal of the driver output unit, a series coupling between a motor and a detection resistor is allowed to be coupled,
wherein the digital control unit generates and supplies a digital drive…

Assignees

• Renesas Electronics Corp

Inventors

• Kurosawa Minoru
• Matsuya Yuki

Classifications

• G11B5/5534

  Physics · mapped topic

• H02P25/034 Primary

  Electricity · mapped topic

• H02P25/028 Primary

  Electricity · mapped topic