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Asynchronous motor speed sensorless control method based on improved Q-MRAS

A speed sensorless, asynchronous motor technology, applied in motor generator control, electronic commutation motor control, control system and other directions, can solve the problem of the decline of the estimation effect, achieve strong load capacity, solve the strong dependence of motor parameters, The effect of high speed identification accuracy

Inactive Publication Date: 2017-09-19
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

However, this method is still sensitive to changes in motor parameters, resulting in a greatly reduced estimation effect at low speeds.

Method used

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  • Asynchronous motor speed sensorless control method based on improved Q-MRAS
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  • Asynchronous motor speed sensorless control method based on improved Q-MRAS

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the description of the drawings and specific embodiments.

[0027] Such as Figure 1 to Figure 14 As shown, an asynchronous motor speed sensorless control method based on the improved Q-MRAS includes the following steps:

[0028] (1) Speed ​​control: According to the deviation between the motor speed estimated by the speed sensorless method and the given speed value, the difference is sent to the speed regulator (PI regulator), and the calculated output is the stator current q-axis The given value of the component;

[0029] (2) Calculation of slip frequency: Calculate the slip angular velocity of the motor according to the q-axis component of the stator current, and add it to the motor speed estimated by the speed sensorless method to obtain the electrical angular velocity of the rotor flux linkage, and pass an integral link The spatial phase of the rotor flux linkage can be obtained;

[0030] ...

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Abstract

The invention provides an asynchronous motor speed sensorless control method based on an improved Q-MRAS. The method includes the steps of rotational speed control: obtaining a given value of a stator current q-axis component, calculating a rotational speed difference frequency, and obtaining a rotational speed difference angular speed and a flux linkage phase of a motor; coordinate transformation: obtaining a stator current under dq-axis by coordinate transformation; current control: obtaining a given value of a stator voltage dq-axis component, modulating space vectors, and performing space vector modulation according to the stator voltage given value to output a drive pulse; and a speed sensorless method: obtaining an estimated motor rotational speed through an appropriately designed reference model and adjustable model based on a Q-MRAS structure. The beneficial effects of the method of the invention are that a rotational speed identification system based on the improved Q-MRAS well fits to the actual rotational speed no matter under a starting process, a state switching process or a low speed condition, the dynamic tracking performance is high, meanwhile the problem of high dependency of a traditional Q-MRAS method on motor parameters is solved, and the identification accuracy and loading capacity are high.

Description

technical field [0001] The invention relates to a speed sensorless control method, in particular to an asynchronous motor speed sensorless control method based on an improved Q-MRAS. Background technique [0002] At present, the high-performance induction motor speed control system will inevitably involve the closed-loop control of the speed. If the speed measuring device such as the speed code disc and the resolver is used to obtain the speed signal, the installation difficulty and cost of the entire speed control system will be increased, and its reliability will also be reduced. will be reduced, and the speed sensorless control technology can be used to observe the speed of the motor in real time, and avoid a series of problems caused by the speed sensor. Now how to improve its accuracy and estimation performance at low speed has become a research hotspot of this technology. At present, most of the speed sensorless vector control frequency conversion speed regulation pro...

Claims

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Application Information

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IPC IPC(8): H02P21/18H02P21/24
CPCH02P21/18H02P21/24
Inventor 王宏王肖杰张东来
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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