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Control method and device of permanent magnet synchronous motor sensorless for electromobile EHPS

A technology of permanent magnet synchronous motor and control method, which is applied in the direction of motor generator control, electronic commutation motor control, control of electromechanical transmission, etc., can solve the problems of poor versatility, out of step, etc., and achieve improved response to impact loads and oscillation loads ability, strong control robustness, and the effect of meeting the requirements of on-load start-up

Pending Publication Date: 2019-03-08
BIT HUACHUANG ELECTRIC VEHICLE TECH
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AI Technical Summary

Problems solved by technology

The "high-frequency signal injection method" is only suitable for salient pole motors, which has poor versatility and is prone to out-of-step problems due to torque fluctuations
However, there is currently no single method that can solve the problem of estimating rotor position and speed in the full speed range, so it is necessary to combine multiple control methods to form a complete control system and method.

Method used

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  • Control method and device of permanent magnet synchronous motor sensorless for electromobile EHPS
  • Control method and device of permanent magnet synchronous motor sensorless for electromobile EHPS
  • Control method and device of permanent magnet synchronous motor sensorless for electromobile EHPS

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Embodiment

[0039] In this embodiment, the permanent magnet synchronous motor (PMSM) sensorless control system for electric vehicle EHPS such as figure 1 As shown, the permanent magnet synchronous motor (PMSM) two-phase stator current sampling i a i b , transmitted to the Clark transformation module and the PARK transformation module, the PARK transformation module is used to obtain the actual current value i in the two-phase rotating coordinate system by using the received estimated value of the rotor position of the motor d and i q , and transmit it to the corresponding current loop PI control module; the q-axis current regulation module generates the q-axis voltage output value u q , and the voltage output value u q transmitted to the inverse PARK transformation module; the d-axis current regulation module generates a d-axis voltage output value u d , and the voltage output value u d transmitted to the inverse PARK transformation module; the inverse PARK transformation module util...

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Abstract

The invention relates to a sensorless control method and device of a permanent magnet synchronous motor of an electromobile EHPS (electric hydraulic power steering system). The control method dependson a permanent magnet synchronous motor DC / AC controller; for a demand of the electromobile EHPS, the controller realizes real-time estimation on the rotor location and speed of the permanent magnet synchronous motor by utilizing the control method of the multi-algorithm fused sensorless, thereby realizing the reliable control on the permanent magnet synchronous motor full rotating speed range ofthe EHPS; the controller can realize the current voltage detection, the external communication, high-voltage inversion and like functions, and external interfaces with high-low voltage supply, AC output, enabling signal and communication line; the controller is conducive to an assisting motor for the EHPS without installing a sensor, the system cost can be reduced, the system complexity is lowered, and the system reliability is improved. Furthermore, the controller can properly reduce the power-assisted steering when the vehicle speed is high, the road feel is improved, and the driving stability of the vehicle is improved.

Description

technical field [0001] The invention belongs to the field of permanent magnet synchronous motor control, in particular to a sensorless control method and device for a permanent magnet synchronous motor used in an electric vehicle EHPS. Background technique [0002] Because the permanent magnet synchronous motor has the characteristics of low power loss, high power density and high reliability, it is widely used in the electric hydraulic power steering system (EHPS) of electric commercial vehicles, and the acquisition of the rotor position information of the permanent magnet synchronous motor is a permanent magnet synchronous The basis of motor control is now mostly obtained by transposition measurement of rotor position sensors such as resolvers or encoders. However, for the working environment of EHPS, the installation and maintenance of sensors are very difficult, which will not only increase the system cost, but also reduce the reliability of the system. Therefore, the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/24B62D5/06
CPCH02P21/24B62D5/06B60L2220/14
Inventor 林程周辉董爱道时军辉邢济垒
Owner BIT HUACHUANG ELECTRIC VEHICLE TECH
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