Motor driving apparatus

A driving device and motor technology, which is applied in the direction of AC motor control, electronic commutation motor control, single motor speed/torque control, etc., can solve the problems of motor drive efficiency drop, converter circuit input power factor drop, etc., to achieve suppression Effects of waveform deformation, reduced impedance, and simple structure

CN1571264AInactive Publication Date: 2005-01-26PANASONIC CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2005-01-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention suppresses the degradation of an input power factor or drive efficiency which is caused by the distortion of a current waveform flowing to a single-phase AC power source under the effect of a regenerative current from a motor 2 or a charging current to internal parasitic capacitance, related to a motor driver 101b of inverter driving that comprises no large capacitance capacitor.The motor driver comprises a single-phase rectification circuit 3 connected to a single-phase AC power source 1, an inverter circuit 4 which is connected to the single-phase rectification circuit 3 and applies a current and a voltage to a motor 2, and an inverter control unit 5b that controls the inverter circuit 4. The inverter control unit 5b controls the current supplied to a motor 2 which is the output of the inverter circuit 4, so that an inverter input voltage Vpn comes to be equal to an absolute value 3 / 4 v 3 / 4 of the voltage of the single-phase AC power source 1.
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Description

technical field

[0001] The present invention relates to a motor drive device, in particular to a motor drive device that drives a motor through a system composed of a single-phase rectifier circuit and an inverter. Background technique

[0002] Conventionally used conventional motor drive devices are devices that drive a motor through a system consisting of a single-phase rectifier circuit and an inverter. Here, the single-phase rectification circuit has a reactor (not shown) for improving a power factor and a smoothing capacitor for smoothing an output voltage of the circuit.

[0003] In such a conventional motor drive device, large-capacity elements are used for the smoothing capacitor and the reactor for improving the power factor, and there are problems in cost, life, efficiency, weight, size, etc. of the motor drive device. The purpose of using large-capacity components for smoothing capacitors and power factor-improving reactors is to avoid deterioration of the power ...

Examples

Embodiment Construction

[0147] Embodiments of the present invention will be described below.

[0148] (Embodiment 1)

[0149] figure 1 It is a block diagram for explaining the motor driving device according to Embodiment 1 of the present invention.

[0150] The motor drive device 100a according to Embodiment 1 of the present invention uses a single-phase AC power supply 1 as an input and uses a three-phase AC output to drive a motor 2 at a desired frequency. In the first embodiment, the above-mentioned motors are referred to as induction motors, DC brushless motors, reluctance motors, etc., but are not limited to these types. In addition, here, the motor drive device 100a described above is a device that drives a motor of a compressor that circulates a coolant loaded in an air conditioner.

[0151] Hereinafter, the single-phase rectification circuit 3, the inverter circuit 4, and the inverter control unit 5a constituting the above-mentioned motor drive device 100a will be described in detail.

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