Motor drive device, fluid compression system and air conditioner

A driving device and motor technology, applied in circuit devices, AC motor control, emergency protection circuit devices, etc., can solve problems such as high prices and declining product price competitiveness, and achieve high reliability

Active Publication Date: 2013-09-18
HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if a microcomputer with a short cycle time is used, this problem can be avoided, but compared with the case where a microcomputer with a cycle time of several μsec is used in a general household electric appliance, the price is high.
Therefore, if such a microcomputer is installed in an air conditioner, the price competitiveness of the product will decrease

Method used

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  • Motor drive device, fluid compression system and air conditioner
  • Motor drive device, fluid compression system and air conditioner
  • Motor drive device, fluid compression system and air conditioner

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach 》

[0053]

[0054] figure 1 It is a system configuration diagram including the motor drive device according to the first embodiment of the present invention. The AC power source 200 represents a power source of AC power transmitted and distributed by a power plant (not shown) or the like.

[0055] The converter circuit 300 is a circuit for converting an AC voltage input from the AC power supply 200 into a DC voltage, and includes a diode bridge in which diodes D1 and D3 are forwardly connected in series, and the connection point between them serves as a converter input terminal. In addition, the same applies to diodes D2 and D4. In addition, a smoothing capacitor C for smoothing a ripple component included in the DC voltage is connected in parallel to the above-mentioned diode bridge.

[0056]Furthermore, the AC power supply 200 and the converter circuit 300 connected to the AC power supply 200 constitute a "DC power supply".

[0057] The motor drive device 100 converts the ...

no. 2 Embodiment approach 》

[0123] The motor drive device 100A according to the second embodiment includes a motor demagnetization protection overcurrent determination unit 46 instead of the overcurrent determination unit 43 described in the first embodiment, and further includes a motor winding temperature detector 50 and a motor demagnetization protection unit. The threshold setting unit 45 is the same as that of the first embodiment except for the above points. Therefore, descriptions are made for different parts, and descriptions for overlapping parts are omitted.

[0124]

[0125] Figure 4 It is a diagram of the system configuration including the motor drive unit.

[0126] The motor winding temperature detector (winding temperature detection unit) 50 detects the motor winding temperature of the motor M, and outputs the temperature to the motor demagnetization protection threshold setting unit 45 at all times.

[0127] The motor demagnetization protection threshold setting unit 45 sets a demagne...

no. 3 Embodiment approach 》

[0162] The motor drive device 100B according to the third embodiment includes an element temperature protection overcurrent determination unit 48 instead of the overcurrent determination unit 43 described in the first embodiment, and further includes an element temperature detector 60 and an element temperature protection threshold value setting. The portion 47 is the same as that of the first embodiment except for the above points. Therefore, the different part will be described, and the description of the overlapping part will be omitted.

[0163]

[0164] Figure 7 A diagram showing the system configuration including the motor drive unit.

[0165] The element temperature detector (element temperature detection unit) 60 detects the temperature of the switching element included in the inverter circuit 11, and outputs the detected element temperature to the element temperature protection threshold value setting unit every moment.

[0166] The element temperature protection...

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PUM

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Abstract

The present invention provides a high-reliability motor drive device, a fluid compression system and an air conditioner. The motor drive device comprises an element short-circuit protection unit (12) which stops the drive of a switching element when a current input from a current detector (20) exceeds a short-circuit protection threshold for preventing short-circuit in an inverter circuit (11). An inverter control unit (40) presumes the current of a motor (M) according the current input from the current detector (20), and performs a process of stopping the drive of the switching element when the current of the motor exceeds other current thresholds related to temperature protection of the switching element and / or demagnetization protection of the motor (M). The processing of the element short-circuit protection unit (12) is carried out without the intervention of a micro computer, and the processing of the inverter control unit (40) is carried out with the intervention of the micro computer.

Description

technical field [0001] The invention relates to a driving device for an electric motor, a fluid compression system and an air conditioner. Background technique [0002] The air conditioner sends the indoor air into the heat exchanger by rotating the indoor fan installed in the indoor equipment, and exchanges heat with the refrigerant circulating in the heat exchanger to heat or cool the air. Air is supplied to the room for air conditioning. In addition, a compressor constituting a part of the heat pump cycle is installed in the outdoor equipment of the air conditioner, and the refrigerant is compressed by the compressor and discharged at high temperature and high pressure. [0003] In addition, as the permanent magnets included in the motor of the compressor, ferrite magnets are used when the price is important, and rare earth magnets such as neodymium magnets are used when the performance is important. Among them, the ferrite magnet has the characteristic of being easily ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/06H02H7/085F04B35/04
CPCH02H5/04H02H7/0833H02H7/0852H02M7/5387
Inventor 奥山敦梅下贵明黑崎真由斯瓦潘·比斯沃斯小仓洋寿
Owner HITACHI JOHNSON CONTROLS AIR CONDITIONING INC
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