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Motor open-phase detection method, motor open-phase protection method, and motor open-phase protection system

A phase loss detection and phase loss protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of inability to detect motor A phase loss and low detection accuracy, so as to avoid motor phase loss operation and improve detection. Accuracy and the effect of protecting the safety of motor operation

Active Publication Date: 2014-01-15
BYD CO LTD
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Problems solved by technology

According to this detection method, if there is indeed a phase loss in the motor, and the rotor position of the motor is in sector 1 or 6 at this time, and the output duty cycle of phase A meets the range of no phase loss, then the phase loss of the motor phase A cannot be detected. Therefore, there is a certain blind area of ​​judgment
[0004] The disadvantage of the existing technology is that there is a certain blind spot in the detection, and the detection accuracy is not high

Method used

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  • Motor open-phase detection method, motor open-phase protection method, and motor open-phase protection system
  • Motor open-phase detection method, motor open-phase protection method, and motor open-phase protection system
  • Motor open-phase detection method, motor open-phase protection method, and motor open-phase protection system

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Embodiment Construction

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0029] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicat...

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Abstract

The invention brings forward a motor open-phase detection method. The method comprise the following steps that: a current state of a motor is obtained; if the motor is in a running state, three-phase currents of the motor are sampled and whether the motor is in an open-phase mode is determined according the sampled three-phase currents; and if the motor is in a non-running state, the three-phase currents and three-phase voltages of the motor are respectively sampled and whether the motor is in an open-phase state is determined according to the sampled three-phase currents and the three-phase voltages. With the method, a dead zone for open-phase determination can be avoided, thereby substantially improving the detection precision. In addition, the invention also brings forward a motor open-phase protection method and a motor open-phase protection system.

Description

technical field [0001] The invention relates to the technical field of electric motors, in particular to a motor phase loss detection method, a motor phase loss protection method and a protection system. Background technique [0002] For the phase loss detection of the motor, it is relatively simple to detect whether the motor has a phase loss during the operation of the motor. It can be judged directly according to whether the integral value of the sampling current of one phase is 0 within a period of time. That is to say, if the current integral value of one phase is 0 and the other two phases are not 0, then it can be determined that the phase is missing. It is more difficult to judge whether the motor is out of phase when the motor does not turn, that is, the motor is not started or the rotating speed of the motor is very low. [0003] At present, when the motor is not rotating, the existing motor phase loss detection method is based on the corresponding relationship be...

Claims

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Application Information

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IPC IPC(8): H02H7/09
Inventor 杨桃桃陈焕龙
Owner BYD CO LTD
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