Disc type iron-core-free permanent magnet synchronous motor controller for electric automobile hub

Abstract

The invention discloses a disc type iron-core-free permanent magnet synchronous motor controller for an electric automobile hub. The disc type iron-core-free permanent magnet synchronous motor controller comprises a control circuit, wherein the signal output end of the control circuit is connected with a voltage type inverter circuit, the power supply input end of the voltage type inverter circuit is connected with the output end of a direct current power supply, the output end of the direct current power supply is also connected with a capacitor C in parallel, an inductor is serially connected between the three-phase output end of the voltage type inverter circuit and each three-phase input terminal of a motor, the signal input end of the control circuit is connected with the power supply input end of the motor through a current sensor, and the signal input end of the control circuit is also connected with an output shaft of the motor through a rotary transformer. The disc type iron-core-free permanent magnet synchronous motor controller has the characteristics of light weight, small volume and flat structure, is capable of outputting a large peak torque in short time to ensure that the output torque of a disc type iron-core-free motor is kept constant, and is good in torque characteristic.

Description

technical field [0001] The invention relates to a synchronous motor controller. In particular, it relates to a disc-type coreless permanent-magnet synchronous motor controller for an electric vehicle wheel hub in which an inductor is connected in series in a control loop. Background technique [0002] As a new type of clean energy, electric energy will become an inevitable trend of future energy development, and electric vehicles will inevitably replace traditional fuel vehicles as the mode of transportation in the new era. At present, related technologies in the field of electric vehicles are a hot topic in research and development, and automotive hub motors are also the focus of recent research. As a core component of the vehicle powertrain system, the motor drive control system must ensure its high efficiency and quick response. At present, the drive system of ordinary electric vehicles mostly adopts centralized drive. The rotational power generated by the motor drives ...

AI Technical Summary

Problems solved by technology

However, since the motor itself has no iron core, the inductance of the stator winding is very small, so when the voltage-based controller drives this type of motor, the stator winding current cannot be continuous, resulting in torque fluctuations in the motor, so the traditional motor control method cannot meet the requirements of the disk type Control Requirements of Ironless Permanent Magnet Synchronous Motor

[0004] Due to the small inductance of the disc coreless motor, the current rises very fast, that is, the electrical time constant τ=L / R is very small, and the existing control strategies basically use PWM modulation technology, based on the inductance of the motor winding of this starting point

When the switching frequency of the switching tube is low, the current of the stator winding cannot be continuous, so the motor without cogging will produce torque fluctuations due to the discontinuity of the current.

When the frequency of modulation and demodulation is high enough, theoretically PWM modulation technology can be applied to this type of motor, so the switching frequency requirements for IGBT are very high, and the switching frequency of current high-power switching tubes cannot meet the requirements

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