A position sensorless control method for permanent magnet synchronous motor (PMSM) with forward and reverse speed regulation

A technology of permanent magnet synchronous motor and control method, which is applied to motor generator control, electronic commutation motor control, rotation direction control, etc. Easy-to-implement, low-computation effects

Active Publication Date: 2019-01-08
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0003] In order to overcome the shortcomings of the existing technology that the permanent magnet synchronous motor can not realize the forward and reverse speed regulation without position sensor control, the present invention provides a full process position sensorless control method of the permanent magnet synchronous motor that can realize forward and reverse rotation

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  • A position sensorless control method for permanent magnet synchronous motor (PMSM) with forward and reverse speed regulation
  • A position sensorless control method for permanent magnet synchronous motor (PMSM) with forward and reverse speed regulation
  • A position sensorless control method for permanent magnet synchronous motor (PMSM) with forward and reverse speed regulation

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings.

[0050] refer to Figure 1 to Figure 7 , a position sensorless control method for a permanent magnet synchronous motor with forward and reverse speed regulation, comprising the following steps:

[0051] 1). The I / F start-up control strategy, whose core is to generate a rotating current vector whose frequency gradually increases and whose amplitude follows a given value, is divided into a pre-positioning stage and an acceleration start-up stage:

[0052]1.1). In the pre-positioning stage, a current with a sufficient amplitude is given to the quadrature-axis (q-axis), while the current on the direct-axis (d-axis) is set to zero, and the given position is 270 degrees (The full text is in electrical angles). In this way, the rotor north pole can be positioned on the α-axis. It should be noted that positioning needs to last for a period of time to ensure successful positi...

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Abstract

A position sensorless control method of permanent magnet synchronous motor with forward and reverse speed regulation is disclosed. includes I/F start-up strategy, switching control strategy, positionestimation strategy and deceleration and inversion strategy. Firstly, the motor current is closed-loop preset to zero, then I/F semi-closed-loop start-up is carried out, and when the motor runs to a certain speed, the motor can be switched to sensorless closed-loop control quickly and smoothly. When receiving the inversion command, decelerate, decelerate to a certain speed and then switch to I/F semi-closed loop control. After continuing to decelerate to zero speed and accelerating to a certain speed in the opposite direction, switch to the closed loop inversion process smoothly without position sensor. During I/F operation, the position signal is obtained by integrating the given velocity. When the speed reaches a certain value, the rotor position of the motor can be estimated accuratelyby the Romberg state observer, and then it is switched to the closed-loop control without position sensor. The invention can realize full-range sensorless control of a permanent magnet synchronous motor rotating in both positive and negative directions.

Description

technical field [0001] The invention relates to the field of permanent magnet synchronous motor control, in particular to a position sensorless control method capable of regulating the speed of a permanent magnet synchronous motor in forward and reverse directions. Background technique [0002] Permanent magnet synchronous motors use permanent magnets instead of excitation windings, which have the advantages of high power density, large torque inertia ratio, and high efficiency. Therefore, they are widely used in many fields such as servo systems, household appliances, and electric vehicles. The vector control of the permanent magnet synchronous motor requires the coordinate transformation of the rotor position information. The traditional method uses a mechanical position sensor to obtain the rotor position, which leads to problems such as increased cost and increased volume and weight of the motor. At present, considering the versatility of the motor, the position sensorle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/13H02P21/18H02P6/182H02P6/30
CPCH02P6/182H02P6/30H02P21/13H02P21/18
Inventor 吴春黄希钟德刚
Owner ZHEJIANG UNIV OF TECH
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