Asynchrony detection method for synchronous motor
A technology for synchronous motors and detection methods, which is applied in motor control, motor generator control, electronic commutation motor control, etc., and can solve problems such as motor reversal and motor rotor reversal
Active Publication Date: 2014-04-02
BYD CO LTD
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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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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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The invention provides an asynchrony detection method for a synchronous motor. The method comprises the following steps: detecting three-phase currents of the synchronous motor, judging whether the relation of the three-phase currents meets the preset condition, and judging that the synchronous motor is asynchronous when the relation of the three-phase currents fails to meet the preset condition. According to the embodiment of the invention, the relation of the three-phase currents is calculated in real time according to the detected three phase-currents, and the three-phase currents of the synchronous motor in the forward rotation form a sine wave with the same amplitudes and the difference of phase position of 120 degrees under the normal condition. The synchronous motor is judged to be asynchronous when the amplitudes of the three-phase currents are not the same or the difference of the phase position is not 120 degrees, so that the further protection treatment like stopping the wave is conducted, then the fault damage is prevented from further expanding, the loss is reduced, and the safety is improved.
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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Patent Timeline
Login to View More IPC IPC(8): H02P8/38
CPCH02P6/001H02P29/021H02P6/12H02P6/34H02P29/0241
Inventor 罗辉杜智勇周旭光张鑫鑫陈星杨桃桃程立品
Owner BYD CO LTD