Motor controlling method and apparatus thereof

• US 20060192513A1
• Filed: 05/02/2006
• Published: 08/31/2006
• Est. Priority Date: 02/25/2002
• Status: Active Grant

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: Maeda, Toshiyuki
• Granted Patent: US 8,587,241 B2
• Time in Patent Office: Days
• US Class Current: 318/443
• CPC Class Codes: H02P 23/0004 Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
• CPC Class Codes: H02P 27/045 whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
• CPC Class Codes: H02P 27/08 with pulse width modulation
• CPC Class Codes: H02P 6/28 Arrangements for controlling current H02P6/10 takes precedence

Abstract

A voltage detection section and current detection section detect a voltage and current supplied to a motor, and the detected voltage and current are supplied to a position detection section. An angular speed output from the position detection section is supplied to a differentiator to output an angular acceleration. A fundamental wave component extraction section extracts a fundamental wave component of the angular acceleration, and the extracted fundamental wave component is supplied to an amplitude adjustment section. The output of the amplitude adjustment section is subtracted from the average current command by a subtraction section. This subtraction result, current detection value, and the rotor position from the position detection section are supplied to a current control section to carry out the current control operation so as to obtain a current command. The current command is supplied to an inverter to control the voltage and current so as to suppress the speed changing due to the load torque changing. Thus, stability is improved, and a decrease in cost is realized.

Claims

1. A motor controlling method configured to control a voltage or current supplied to a motor from an inverter so as to suppress rotation speed changing of the motor with respect to a periodical load, the method comprising:

partially outputting negative torque from the inverter, and

utilizing regeneration power during the above operation for motor driving again.

2. The motor controlling method as set forth in claim 1, further comprising

carrying out a compensation operation for dead time of the output voltage.

3. A motor controlling apparatus configured to control a voltage or current supplied to a motor from an inverter so as to suppress rotation speed changing of the motor with respect to a periodical load, wherein the apparatus employs an inverter which partially outputs negative torque from the inverter, and utilizes regeneration power during the above operation for motor driving again, as the inverter.

4. The motor controlling apparatus as set forth in claim 3, wherein

the inverter further carries out a compensation operation for dead time of the output voltage.