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Motor control device and air conditioner using same

A technology of motor control and motor, applied in the direction of controlling electromechanical transmission, controlling generator, controlling electromechanical brake, etc., can solve the problems of high cost, complicated structure of motor and fan, etc., and achieve the effect of reducing sound

Inactive Publication Date: 2014-08-27
HITACHI APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the method of installing anti-vibration rubber in order to reduce the resonance noise of the fan and the rotor has the following problems: the structure of the motor and the fan becomes complicated and the cost becomes high

Method used

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  • Motor control device and air conditioner using same
  • Motor control device and air conditioner using same
  • Motor control device and air conditioner using same

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] Embodiments for implementing the present invention will be described below with reference to the drawings. First, refer to Figure 1 to Figure 7 A motor control device according to a first embodiment of the present invention will be described.

[0024] figure 1 It shows the internal structure of the motor control device 11 of the first embodiment of the present invention, and the motor control device 11 , a DC power supply 12 , and a three-phase AC synchronous motor (abbreviated as "motor" or "three-phase motor" as appropriate) 13 A graph of the correlation with the load (fan) 14.

[0025] exist figure 1 Among them, the motor control device 11 is configured to include an inverter 15 as a DC-AC power converter, and a control device 17 that controls the inverter 15 .

[0026] In addition, the control device 17 is configured to include a PWM (Pulse Width Modulation: Pulse Width Modulation) pulse generation unit 22, a vector control unit 18, a motor current sign informa...

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Abstract

The subject of the invention provides an efficient motor control device capable of reducing noise caused by resonance of fans and rotators. The motor control device is provided with an inverter for converting DC power into variable voltage variable frequency AC power and performing driving control on a three-phase motor; a vector control part for applying voltage on the three-phase motor; a motor current signal information generation part for generating signal information of motor current of the vector control part; a dead zone time distortion compensation part for generating dead zone time distortion compensation values from the signal information of motor current of the motor current signal information generation part; a dead zone time distortion compensation addition part for adding the applied voltage of the vector control part with the dead zone time distortion compensation values of the dead zone time distortion compensation generation part; and a PWM pulse generation part for performing pulse width control on the inverter according to the signals of the dead zone time distortion compensation addition part, the dead zone time distortion compensation values periodicity change nearby a current zero crossing point.

Description

technical field [0001] The present invention relates to a control method of a motor control device and an air conditioner using the control method. Specifically, it relates to the reduction of the sound originating in the fan motor. Background technique [0002] Conventionally, small fan motors used in air conditioners have a problem of generating noise at a specific rotational speed due to resonance between the rotor and the fan. In order to solve the problem of noise caused by this resonance, anti-vibration rubber is provided on the rotor portion, or anti-vibration rubber is provided on the bushing of the fan to reduce the sound. [0003] One of the causes of the resonance sound is the distortion of the periodic current waveform, and one of the distortions of the current waveform is considered to be the distortion of the dead time of the inverter. Switching hysteresis exists in various switching elements and drive circuits used in inverters that perform PWM. Therefore, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P27/06H02P21/05H02P21/22H02P23/04H02P27/08
CPCF25B49/025F25B2600/11H02P21/05
Inventor 奥山敦田村建司小仓洋寿B·斯瓦潘蓝原央尭
Owner HITACHI APPLIANCES INC
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