Motor controlling method and apparatus thereof

• US 20060192512A1
• 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 8,339,083 B2
• Time in Patent Office: Days
• US Class Current: 318/432
• 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 a motor from an inverter so as to suppress rotation speed changing of the motor with respect to a periodical load, the method comprising:

controlling the voltage or current so as not to exceed a current maximum value of power devices of the inverter taking precedence over the suppression of rotation speed changing.

2. The motor controlling method as set forth in claim 1, further comprising controlling the voltage or current so as not to exceed a current maximum value of power devices of the inverter by reducing the amplitude of the output torque changing.

3. The motor controlling method as set forth in claim 1, further comprising controlling the voltage or current so as not to exceed a current maximum value of power devices of the inverter by changing the waveform of the current, voltage or torque command into a form having a lower peak current with respect to the average current.

4. The motor controlling method as set forth in claim 3, further comprising carrying out the changing of the waveform by clipping the waveform of the current, voltage or torque command with a standard value.

5. 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, the apparatus comprising:

a control device configured to control the voltage or current so as not to exceed a current maximum value of power devices of the inverter taking precedence over the suppression of rotation speed changing.

6. The motor controlling apparatus as set forth in claim 5, wherein the control device controls the voltage or current so as not to exceed a current maximum value of power devices of the inverter by reducing the amplitude of the output torque changing.

7. The motor controlling apparatus as set forth in claim 5, wherein the control device controls the voltage or current so as not to exceed a current maximum value of power devices of the inverter by changing the waveform of the current, voltage or torque command into a form having a lower peak current with respect to the average current.

8. The motor controlling apparatus as set forth in claim 7, wherein the control device carries out the changing of the waveform by clipping the waveform of the current, voltage or torque command with a standard value.