Three-phase motor open-phase detection method and system

A three-phase motor and phase loss detection technology, which is applied in the direction of multi-phase network asymmetry measurement, etc., can solve problems such as safety hazards and load movement, so as to improve reliability, reduce the possibility of misjudgment, and realize the effect of phase loss protection

Active Publication Date: 2017-05-10
SHANGHAI STEP ELECTRIC +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

This patented technology helps prevent damage caused by insufficient electrical connections between phases during an AC machine's startup process. It uses specific voltages applied across different pairs of rotors before starting them up. By comparing these currents from both sets of coils, if they have equal values, indicating either being good enough (positive), or bad) respectively, then identifying potential problems such as short circuits may be identified based upon their relative timing. Additionally, the system includes multiple sensitivities to ensure accurate identification even after initial power supply has been interrupted due to temporary overvoltage conditions. Overall, this technique enhances safety measures against faulty electric machines while ensuring reliable performance.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the accuracy and reliability of detecting motor phase failure without causing significant financial losses or potential accidents from delayed starting up operations.

Method used

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  • Three-phase motor open-phase detection method and system

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0025] The first embodiment of the present invention relates to a phase loss detection method of a three-phase motor, the specific process is as follows figure 1 shown. This embodiment is implemented on the basis of a phase loss detection system of a three-phase motor including a power supply, a power converter and a three-...

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Abstract

The invention relates to the motor control field and discloses a three-phase motor open-phase detection method and system. The method comprises steps that when a start instruction is received, a detection voltage is applied to a first stator winding and a second stator winding of a three-phase motor; if a current absolute value of each stator winding after application of the detection voltage reaches a preset current threshold within preset duration, the detection voltage is applied to the first stator winding or the second stator winding and is further applied to a third stator winding; if a current absolute value of each stator winding after re-application of the detection voltage reaches the preset current threshold within the preset duration, the three-phase motor is determined to be in a non-open-phase state, and the three-phase motor starts. The method is advantaged in that whether the three-phase motor is an open-phase motor can be detected through applying the detection voltage onto the three-phase motor two times, the three-phase motor starts after the three-phase motor is determined to be in the non-open-phase state, open-phase protection of the motor is realized, and operation reliability of the motor is further improved.

Description

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Claims

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Application Information

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Owner SHANGHAI STEP ELECTRIC
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