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Method for carrying out distribution and efficiency optimization control on motor vector control reference current

A technology of reference current and vector control, which is applied in vector control system, motor generator control, electromechanical brake control, etc. It can solve problems such as complex operating conditions, reduced motor utilization, large motor temperature fluctuations, etc., to achieve narrow search range, improve utilization, and reduce the effect of repeating the steps of determining the optimal point search direction

Inactive Publication Date: 2018-11-02
HUNAN MECHANICAL & ELECTRICAL POLYTECHNIC
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Problems solved by technology

[0003] The operating conditions of existing electric vehicles are complex, and the temperature of the motor fluctuates greatly under the condition of limited heat dissipation. Excessively high temperatures will easily reduce the utilization rate of the motor; in the prior art, in order to prevent the motor from heating up, real-time observation of the motor stator winding Temperature and motor efficiency optimization control in two ways

Method used

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  • Method for carrying out distribution and efficiency optimization control on motor vector control reference current
  • Method for carrying out distribution and efficiency optimization control on motor vector control reference current
  • Method for carrying out distribution and efficiency optimization control on motor vector control reference current

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Embodiment

[0034] Embodiment: a method for distributing and optimizing efficiency control of the motor vector control reference current, such as figure 1 shown, including the following steps:

[0035] Step one, analyze and evaluate the motor loss.

[0036] Analyze and preliminarily estimate the loss and loss ratio during the operation of the motor. The loss includes copper loss, iron loss, mechanical loss and stray loss.

[0037] Step 2, build the motor loss model.

[0038] A motor loss model is constructed according to the results of the motor loss analysis and evaluation, and the motor loss model includes a d-axis equivalent circuit of the motor and a q-axis equivalent circuit of the motor.

[0039] Step 3: Calculate the suboptimal direct-axis current component i based on the motor loss model d0 and the suboptimal quadrature axis current component i q0 . Under the condition of only considering the copper loss and iron loss of the motor, the suboptimal direct-axis current component...

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Abstract

The invention discloses a method for carrying out distribution and efficiency optimization control on a motor vector control reference current, relates to the technical field of motors, and solves theproblem as follows: due to the fact that a motor is maintained at a certain working condition, the steady-state time is very short, and the speed requirement of an electric automobile traction motoron the efficiency optimization process is very high, a large amount of energy loss in the controlled quantity optimizing process can be easily caused, and even in limited steady-state time, the highest efficiency point of the system is not reached; the technical scheme is characterized in that the method comprises the following steps of analyzing and evaluating motor loss; establishing a motor loss model, wherein the motor loss model is constructed according to the motor loss analysis and evaluation results; calculating a suboptimal-level direct-axis current component i<d0> and a suboptimal-level quadrature-axis current component i<q0> based on the motor loss model; and searching the optimal point based on a golden section method. The method has the advantage that the system efficiency optima point is quickly found in the limited steady-state time, so that the utilization rate of the motor is improved.

Description

technical field [0001] The invention relates to the technical field of motors, more specifically, it relates to a method for distributing reference currents for vector control of motors and optimizing efficiency control. Background technique [0002] As the core component of the electric drive system and an important power output source, the drive motor is an important part of the electric vehicle. On the one hand, the motor output and regenerative power required by electric vehicles continue to increase to meet the needs of different models in different working conditions; Dimensional development. Among them, the permanent magnet synchronous motor has many advantages such as small size, light weight, high efficiency, wide speed range, high power density, and fast dynamic response. It is especially suitable for electric vehicles and their drive systems, and has become a hot spot in current research and application. [0003] The operating conditions of existing electric veh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
CPCH02P21/14
Inventor 刘建林刘平罗德荣雷伟民
Owner HUNAN MECHANICAL & ELECTRICAL POLYTECHNIC
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