MOTOR CONTROL DEVICE

• US 20160329844A1
• Filed: 01/06/2015
• Published: 11/10/2016
• Est. Priority Date: 01/10/2014
• Status: Active Grant

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: ITAGAKI, Tetsuya, SATO, Toshiaki
• Granted Patent: US 9,929,682 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F24H 4/02 Water heaters
• CPC Class Codes: F25B 2500/26 characterised by the startup of the refrigeration cycle
• CPC Class Codes: F25B 30/02 of the compression type
• CPC Class Codes: F25B 31/02 of motor-compressor units
• CPC Class Codes: F25B 49/025 Motor control arrangements
• CPC Class Codes: H02P 1/58 sequentially
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence
• CPC Class Codes: H02P 6/18 without separate position detecting elements
• CPC Class Codes: Y02B 30/12 Hot water central heating systems using heat pumps

Abstract

A motor control device is configured to drive a first motor that rotates a first rotation body. and a second motor that rotates a second rotation body. The motor control device includes a power supply unit, inverters configured to convert an output from the power supply unit to an alternating current and supply the output to the first motor and the second motor, and a control unit configured to drive the second motor using rotor position sensorless control. The control unit may be configured to not start up the second motor during a predetermined operation in which a large current flowing through the first motor is being performed.

Claims

1. A motor control device configured to drive a first motor that rotates a first rotation body and a second motor that rotates a second rotation body, the motor control device comprising:

a power supply unit;

inverters configured to convert an output from the power supply unit to an alternating current and supply the output to the first motor and the second motor; and

a control unit configured to drive the second motor using rotor position sensorless control,

the control unit being configured to not start up the second motor during a predetermined operation in which a large current flowing through the first motor is being performed.

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

the first rotation body is a compressor, and in case the first motor is driven using rotor position sensorless control, the predetermined operation of the first motor is a synchronous operation of the compressor.

2. A motor control device configured to drive a first motor that rotates a first rotation body and a second motor that rotates a second rotation body, the motor control device comprising:

a power supply unit;

inverters configured to convert an output from the power supply unit to an alternating current and supply the output to the first motor and the second motor; and

a control unit configured to drive the second motor using rotor position sensorless control,

the control unit including a determination unit configured to determine whether the second motor is in an abnormal state or not, and

the control unit being further configured to cancel the determination of the determination unit even if the determination unit has determined that the inverter for the second motor is in an abnormal state when the second motor is in operation and the first motor performs a predetermined operation.

6. The motor control device according to claim 2, wherein

the operation of the second motor is a startup operation.

7. The motor control device according to claim 6, wherein

the first rotation body is a compressor, and in case the first motor is driven using rotor position sensorless control, the predetermined operation of the first motor is a synchronous operation of the compressor.

8. The motor control device according to claim 2, wherein

the first rotation body is a compressor, and in case the first motor is driven using rotor position sensorless control, the predetermined operation of the first motor is a synchronous operation of the compressor.

3. A motor control device configured to drive a first motor that rotates a first rotation body and a second motor that rotates a second rotation body, the motor control device comprising:

a power supply unit;

inverters configured to convert an output from the power supply unit to an alternating current and supply the output to the first motor and the second motor;

a control unit configured to drive the second motor using rotor position sensorless control; and

a collective control unit configured to collectively control two or more control units including the control unit,

the control unit including a determination unit configured to determine whether the second motor is in an abnormal state or not, and

the control unit being further configured to perform a retry action of an operation of the inverter without notifying the collective control unit of an abnormal state even if the determination unit has determined that the inverter for the second motor is in an abnormal state when the second motor is in operation and the first motor performs a predetermined operation.

4. The motor control device according to claim 3, wherein

the operation of the second motor is a startup operation.

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

the first rotation body is a compressor, and in case the first motor is driven using rotor position sensorless control, the predetermined operation of the first motor is a synchronous operation of the compressor.

10. The motor control device according to claim 3, wherein

the first rotation body is a compressor, and in case the first motor is driven using rotor position sensorless control, the predetermined operation of the first motor is a synchronous operation of the compressor.