Slip frequency vector control method for asynchronous motor

A technology of slip frequency and vector control, which is applied in vector control system, motor generator control, electronic commutation motor control, etc., and can solve problems such as inaccurate control

Inactive Publication Date: 2012-09-26
宁波乐邦电气有限公司
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  • Abstract
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Problems solved by technology

[0003] The main purpose of the present invention is to overcome the existing technical defects, provide an asynchronous motor slip frequency vector that can overcome the problem of inaccurate control caused by the change of the motor rotor parameters, and greatly improve the robustness of the control system to the motor parameters. Control Method

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  • Slip frequency vector control method for asynchronous motor

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in detail:

[0019] As shown in the figure: IM represents asynchronous motor, the present invention provides a kind of asynchronous motor slip frequency vector control method, it comprises the following steps:

[0020] Step 1. Parameter initialization; after the inverter is powered on, the parameter initialization is completed, and the motor parameters and control parameters in the motor control are set. In the commonly used slip frequency vector control system, the speed loop and current loop double closed-loop control strategy is adopted. , the system has a set of preset motor parameters, including stator side and rotor side, which can be provided by the motor manufacturer or obtained from the motor nameplate.

[0021] Step 2. Sampling the three-phase stator current of the motor and detecting the angular velocity of the motor ω r ; Feedback motor angular velocity...

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Abstract

The invention provides a slip frequency vector control method for an asynchronous motor. By the method, the problem that an actual slip angular speed is deviated from the set slip angular speed in the conventional method is solved; an increment of a motor slip angular speed which changes along with a rotor side parameter of a motor is added by a model adaptive method; the set slip angular speed is modified by the increment and the slip angular speed in a motor control model is adjusted to be close to an actual value, so that the problem that a rotor magnetic field is not positioned accurately because the rotor side parameter changes can be solved; and therefore, the robustness over motor parameters of a control system is greatly improved.

Description

Technical field: [0001] The invention relates to a control algorithm of a three-phase asynchronous motor, in particular to a slip frequency vector control method of the asynchronous motor. Background technique: [0002] The traditional asynchronous motor slip frequency vector control method uses fixed motor rotor parameters to calculate the time constant. This method needs to accurately grasp the motor rotor parameters. Constantly changing, and the law of this change is difficult to obtain in advance, such as: usually in the case of constant excitation, the resistance change caused by the temperature rise of the motor can reach 0.75 to 1.5 times its nominal value. The consequence of this parameter change is that the actual flux linkage of the rotor and the design flux linkage of the control system produce phase and amplitude deviations. In the slip frequency vector control system, the direct consequence is that the stator current deviates from the design value, and the moto...

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Application Information

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IPC IPC(8): H02P21/14H02P21/10
Inventor 胡庆波
Owner 宁波乐邦电气有限公司
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