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Virtual signal injection-based maximum torque current ratio control method of synchronous motor

A technology of maximum torque current and virtual signal, which is applied in the field of maximum torque current ratio control based on virtual signal injection, can solve problems such as motor efficiency reduction, stator current increase, d-axis current reference value deviation, etc., to ensure stable State accuracy, improve the effect of response

Active Publication Date: 2018-03-13
ZHEJIANG UNIV
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Problems solved by technology

[0004] However, during the operation of the motor, due to the influence of iron core saturation and temperature rise, L d , L q and ψ f will change, so the d-axis current refere

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  • Virtual signal injection-based maximum torque current ratio control method of synchronous motor
  • Virtual signal injection-based maximum torque current ratio control method of synchronous motor
  • Virtual signal injection-based maximum torque current ratio control method of synchronous motor

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Abstract

The invention discloses a virtual signal injection-based maximum torque current ratio control method of a synchronous motor. A tidy signal is injected to a stator current angle to obtain a derivativeof an electromagnetic torque on the stator current angle, and then a stator current angle reference value is obtained; and next, a stator current amplitude reference value is obtained by a fixed torque constant and an open loop compensation integrator, and then a d-q-axis current reference value is obtained. By virtue of the more accurate formula disclosed in the invention, the steady state precision is ensured; and by virtue of square wave injection and processing method, dynamic response is improved.

Description

technical field [0001] The invention relates to a maximum torque current ratio control of a permanent magnet synchronous motor, in particular to a maximum torque current ratio control based on virtual signal injection. Background technique [0002] Due to the anisotropy of the magnetic circuit, the d-axis and q-axis inductance of the interior permanent magnet synchronous motor are not equal, so the torque of the interior permanent magnet synchronous motor includes two parts: permanent magnet torque and reluctance torque. There is an optimal combination between these two parts, so that the stator current is the smallest under the same torque. This operating state is called the maximum torque current ratio control. [0003] In order to obtain the d-q-axis current reference value at the maximum torque-current ratio, the common method is to first obtain the q-axis current reference value through the speed loop, and then pass a d-axis inductance L d , q-axis inductance L q and ...

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Application Information

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IPC IPC(8): H02P21/22H02P21/20
Inventor 黄晓艳王俊方攸同
Owner ZHEJIANG UNIV
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