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Motor control device

A technology of motor control and motor, which is applied in the direction of control system, motor control, current controller, etc., can solve the problems that compressor vibration cannot be suppressed, does not exist, etc., to improve reliability, reduce danger, and suppress buzzing sound Effect

Active Publication Date: 2009-08-12
DAIKIN IND LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, until now, the rectified voltage having the pulsation rectified by the rectifier circuit has been input to the commutation circuit without smoothing, and there is no device capable of torque control in the motor control device of the commutation circuit.
Therefore, in the case of controlling the compressor motor using such a motor control device, the vibration of the compressor cannot be suppressed.

Method used

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Examples

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example 2—

[0073] Modification 2 of the embodiment will be described. In this modified example 2, such as Figure 6 As shown, the motor control unit 41 includes a buzzer rotation speed storage unit 47 . The buzzer rotation speed storage unit 47 stores the rotation speed range of the motor 30 where the buzzer sound is generated as the buzzer sound generation range. The buzzer sound generating region is derived from, for example, an experiment performed at the time of design, and is stored in the buzzer rotation speed storage unit 47 .

[0074] In this motor control device 10, the motor control unit 41 is configured to keep the rotation speed of the motor 30 within the buzzer generation range when the torque control operation is prohibited. That is, the motor control unit 41 controls the rotational speed of the motor 30 so that the rotational speed of the motor 30 does not continue in the buzzer generation region during the torque control operation. For example, when adjusting the rotat...

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PUM

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Abstract

A motor control device (10) includes: a power conversion unit (40) having a rectification circuit (20) for rectifying AC voltage from an AC power supply (31), a capacitor circuit (22) for receiving an output from the rectification circuit (20) and outputting a pulsating rectified voltage from both ends of the capacitor (13), and an inverter circuit (25) for receiving the rectified voltage and outputting AC current to a motor (30); and a motor control unit (41) for controlling the inverter circuit (25) so as to control the motor (30). The motor control unit (41) performs torque control operation to vary the output torque of the motor (30) inaccordance with the load torque of the motor (30).

Description

technical field [0001] The present invention relates to a motor control device for a compressor motor including a rectifier circuit, a capacitor circuit, and a converter circuit. Background technique [0002] In conventionally known motor control devices for controlling a compressor motor, an AC voltage from an AC power source is rectified by a rectifier circuit, and the rectified voltage containing pulsations is input to the commutation circuit with little smoothing. An example of such a motor control device is disclosed in Patent Document 1. [0003] Specifically, the motor control device of Patent Document 1 includes a single-phase diode full-wave rectification circuit, a small-capacity smoothing capacitor, and a PWM inverter for control. The small-capacity smoothing capacitor is about 1 / 100 of the capacity of the conventional smoothing capacitor of the motor control device. For this reason, this motor control device is not a capacitor with a constant voltage, and the r...

Claims

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Application Information

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IPC IPC(8): H02P6/10H02P6/06H02P6/08H02P6/28
CPCH02P23/004H02P23/30H02P29/032H02P29/50F04B17/03H02P7/28H02P27/06
Inventor 关本守满芳贺仁阿卜杜拉·梅基川嶋玲二榊原宪一前田敏行
Owner DAIKIN IND LTD
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