Method, system and device for temperature rise prediction and protection of permanent magnet synchronous motor
A permanent magnet synchronous and protection system technology, applied in the direction of motor control, control system, electrical components, etc., can solve the problems of permanent magnet synchronous motor temperature rise and speed up, permanent magnet synchronous motor torque drop, unable to realize the function of maintaining pressure, etc. Achieve the effects of reducing error, wide application range, and suppressing temperature rise
Active Publication Date: 2020-12-04
GUANGZHOU HKUST FOK YING TUNG RES INST
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Problems solved by technology
This method is not suitable for occasions with high torque requirements, such as the pressure holding stage of the injection molding process, which requires the permanent magnet synchronous motor to continuously provide a constant high torque, which will cause the temperature rise of the permanent magnet synchronous motor to increase. If Now, according to the method proposed in the patent document (CN 104124666 A), it is necessary to reduce the current of the permanent magnet synchronous motor and reduce the working time of the pressure holding stage, which will cause the torque of the permanent magnet synchronous motor to drop, and the pressure holding function cannot be realized, and then affected product quality
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[0061] The present invention will be further explained and described below in conjunction with the accompanying drawings and specific embodiments of the description. For the step numbers in the embodiment of the present invention, it is only set for the convenience of explanation and description, and there is no limitation on the order of the steps. The execution order of each step in the embodiment can be carried out according to the understanding of those skilled in the art Adaptive adjustment.
[0062] refer to figure 1 , the permanent magnet synchronous motor temperature rise prediction and protection method of the present invention, comprises the following steps:
[0063] Calculate the heating value of the motor stator;
[0064] Calculate the heat dissipation of the motor;
[0065] Calculate the temperature of the motor rotor;
[0066] Calculate the overall temperature of the motor according to the calculated calorific value of the motor stator, the heat dissipation o...
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The invention discloses a temperature rise prediction and protection method, system and device of a permanent-magnet synchronous motor. The method comprises steps of calculating heating quantity of amotor stator; calculating heat dissipation quantity of the motor; calculating the temperature of a motor rotor; according to the calculated heating quantity of the motor stator, the calculated heat dissipation quantity of the motor and the calculated temperature of the motor rotor, calculating the whole temperature of the motor; and according to the whole temperature of the motor, using any kind way of forced air cooling and natural cooling to carry out cooling control on the motor. The system comprises a motor stator heating quantity calculation module, a medium heat dissipation energy calculation module, a motor rotor magnet heating quantity calculation module, a motor whole temperature calculation module and a motor cooling control module. The device comprises a memory and a processor.According to the invention, errors of temperature rise calculation is reduced, results are quite precise, application ranges are wide and the method, the system and the device can be widely applied tothe technical field of motor control.
Description
technical field [0001] The invention relates to the technical field of motor control, in particular to a method, system and device for temperature rise prediction and protection of a permanent magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor is mainly composed of rotor, end cover and stator. Among them, the stator structure of the permanent magnet synchronous motor is very similar to that of the ordinary induction motor, and the biggest difference between the rotor structure and the asynchronous motor is that high-quality permanent magnet poles are placed on the rotor. The permanent magnet synchronous motor has the advantages of simple structure, small size, high efficiency and high power factor. At present, permanent magnet synchronous motors have been widely used in new energy vehicles, injection molding machines, robots and other equipment. However, the permanent magnet synchronous motor will have a "temperature rise" phenom...
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IPC IPC(8): H02P29/60
CPCH02P29/60
Inventor 张碧陶姚科高福荣
Owner GUANGZHOU HKUST FOK YING TUNG RES INST