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A Synchronous Motor Out-of-Step Detection Method

A technology of synchronous motor and detection method, which is applied in motor control, motor generator control, monitoring commutation and other directions, and can solve problems such as motor reversal and motor rotor reversal.

Active Publication Date: 2017-05-31
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. There is no rotating magnetic field after out of step: that is, the stator magnetic field and the rotor do not rotate
[0004] 2. The motor reverses after out of step: the motor rotor reverses due to load impact or other reasons

Method used

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  • A Synchronous Motor Out-of-Step Detection Method
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  • A Synchronous Motor Out-of-Step Detection Method

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Embodiment Construction

[0018] 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.

[0019] In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or elem...

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PUM

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Abstract

A method for checking an out-of-step of a synchronous motor includes detecting three-phase currents of the synchronous motor; determining whether a relationship between the three-phase currents satisfies a preset requirement; and if no, determining that the synchronous motor is out of step. It is determined that the synchronous motor is out of step when amplitudes of each current of the three-phase currents are not equal or when the phase difference between the three-phase currents is not 120°.

Description

technical field [0001] The invention relates to the technical field of motor control. In particular, it relates to a step-out detection method of a synchronous motor. Background technique [0002] The control methods of permanent magnet synchronous motor (PMSM) are divided into position sensor control and position sensorless control. For motor control with position sensor, the magnetic field position of the motor is determined by position sensor detection. The position of the rotor without position sensor control is estimated by the position estimation module in the software. Out of step is defined relative to synchronization, that is, the rotating magnetic field of the stator and the magnetic field of the rotor magnet are not synchronous. In the PMSM system, the system load is too high or the performance of the motor itself is degraded and other reasons will lead to out of step. After the motor out of step, its speed is generally uncontrollable, which will have serious co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P8/38
CPCH02P6/12H02P6/34H02P29/0241
Inventor 罗辉杜智勇周旭光张鑫鑫陈星杨桃桃程立品
Owner BYD CO LTD