Motor control device

• US 10,250,170 B2
• Filed: 08/24/2016
• Issued: 04/02/2019
• Est. Priority Date: 08/24/2016
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Sho, Sayaka, Hattori, Jun, Haishi, Atsuo, Harakawa, Masaya
• Primary Examiner(s): Dinh, Thai T
• Application Number:
  US15/565,237
• Publication Number:
  US 20180309393A1
• Time in Patent Office: 951 Days
• CPC Class Codes: B29C 2045/1792 Machine parts driven by an electric motor, e.g. electric servomotor
• CPC Class Codes: B29C 45/76 Measuring, controlling or regulating measuring in general G01; controlling or regulating in general G05
• CPC Class Codes: H02P 2205/07 Speed loop, i.e. comparison of the motor speed with a speed reference
• CPC Class Codes: H02P 5/46 for speed regulation of two or more dynamo-electric motors in relation to one another
• CPC Class Codes: H02P 5/74 controlling two or more ac dynamo-electric motors H02P5/46, H02P5/60 take precedence
• CPC Class Codes: H02P 6/04 Arrangements for controlling or regulating the speed or torque of more than one motor H02P6/10 takes precedence

Abstract

A motor control device includes a master-shaft drive device to drive a master-shaft motor, and a slave-shaft drive device to drive a slave-shaft motor, the motor control device including a correction-amount calculation unit to use a detection result of a position of the master-shaft motor and a detection result of a position of the slave-shaft motor to calculate a correction amount for correcting a speed command that is to be used for controlling the master-shaft motor, a correction unit to use the correction amount to correct the speed command that is to be used for controlling the master-shaft motor, and a position control unit to execute position control on the slave-shaft motor by using the detection result of the position of the master-shaft motor as a position command.

Claims

1. A motor control device including a first drive device to drive a first motor, and a second drive device to drive a second motor, the motor control device comprising:

a correction-amount calculator to use a detection result of a position of the first motor, and a detection result of a position of the second motor to calculate a correction amount for correcting a command that is to be used for controlling the first motor;

a corrector to use the correction amount to correct the command that is to be used for controlling the first motor; and

a position controller to execute position control on the second motor by using the detection result of the position of the first motor as a position command.

2. The motor control device according to claim 1, wherein the command is a speed command.

3. The motor control device according to claim 1, wherein the command is a torque current command.

4. The motor control device according to claim 1, wherein

the second motor is one in number, and

the correction-amount calculator calculates the correction amount such that a difference between the detection result of the position of the first motor and the detection result of the position of the second motor becomes zero.

5. The motor control device according to claim 1, wherein

the second motor is plural in number, and

the correction-amount calculator selects one of detection results of plural positions corresponding one-to-one to the plural second motors, the selected detection result corresponding to the second motor that is most lagging in rotation, the correction-amount calculator calculating the correction amount such that a difference between the detection result of the position of the first motor and the selected detection result becomes zero.