Phase loss detection method for three-phase motor and detection circuit

A technology of a three-phase motor and a detection method, applied in the field of detection, can solve problems such as the inability to effectively protect the three-phase motor, and achieve the effect of improving timely protection

Active Publication Date: 2013-10-30
GREE ELECTRIC APPLIANCES INC
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The main purpose of the present invention is to provide a detection method and a detection circuit for the lack of phase of a three-phase motor, so...

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  • Phase loss detection method for three-phase motor and detection circuit
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  • Phase loss detection method for three-phase motor and detection circuit

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Embodiment Construction

[0028] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0029] An embodiment of the present invention provides a detection circuit for phase loss of a three-phase motor, figure 1 is a schematic diagram of the connection between the detection circuit and the compressor according to the embodiment of the present invention, such as figure 1 As shown, the detection circuit in this embodiment includes a three-phase inverter (three-phase inverter bridge), a power supply, a detection module (current detection circuit) and a control module (control chip).

[0030] Among them, in the detection circuit of the embodiment of the present invention, the DC inverter compressor of the air conditioner is used as a specific three-phase motor for illustration, and th...

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Abstract

The invention discloses a phase loss detection method for a three-phase motor and a detection circuit. The phase loss detection method for the three-phase motor comprises the steps of inputting a test current which is less than a starting current of the three-phase motor to the three-phase motor before the start of the three-phase motor; detecting a current value of a winding of the three-phase motor; determining whether the detected current value is less than or equal to a preset current value; and determining phase loss of the three-phase motor when the detected current value is less than or equal to the preset current value. Power supply for the three-phase motor is stopped when phase loss of the three-phase motor is determined. The phase loss detection method for the three-phase motor and the detection circuit are used for solving the problem that a phase loss detection method for the three-phase motor cannot effectively protect the three-phase motor in the prior art, thereby improving the effect of timely protection of the three-phase motor.

Description

technical field [0001] The invention relates to the field of detection, in particular to a detection method and a detection circuit for phase loss of a three-phase motor. Background technique [0002] Existing three-phase motors only detect the current flowing through the three-phase windings of the three-phase motor during operation. The phase motor is out of phase. However, this detection method cannot effectively protect the three-phase motor when it is started. When the three-phase motor is starting, if there is a phase that is not connected or has poor contact between the three-phase motor and the frequency converter, the three-phase motor is prone to failure or even damage during the starting process. Take the compressor as an example. If there is a phase disconnection or poor contact between the DC inverter compressor and the inverter, then when the compressor starts, the compressor will lose control due to lack of phase and overcurrent will occur. Protection, will...

Claims

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Application Information

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IPC IPC(8): G01R31/34G01R29/16G01R19/165
Inventor 陈洪涛刘浚杰李辉张雪芬
Owner GREE ELECTRIC APPLIANCES INC
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