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Initial speed identification and belt speed restarting control method and device for asynchronous motor

An initial speed, asynchronous motor technology, used in motor control, motor generator control, AC motor control and other directions, can solve problems such as complex algorithms, and achieve accurate search results, high reliability, and consistent full speed range.

Pending Publication Date: 2022-04-22
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

The method of Chinese patent CN113437919A is simple to implement and the result is reliable, but it needs additional hardware; The accuracy of the results also depends on the accuracy of the rotor flux observer

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  • Initial speed identification and belt speed restarting control method and device for asynchronous motor
  • Initial speed identification and belt speed restarting control method and device for asynchronous motor
  • Initial speed identification and belt speed restarting control method and device for asynchronous motor

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Embodiment Construction

[0058] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0059] During the phase of blocking the inverter, the Lomberg observer speed estimation stops working accordingly. Although the control system may be equipped with a speed measuring device that indirectly reflects the motor speed such as vehicle speed monitoring and can communicate with the traction system, its accuracy and timeliness cannot be guaranteed. It is necessary to identify the motor ...

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Abstract

The invention belongs to the field of motor control, and particularly discloses an initial speed identification and belt speed restarting control method and device of an asynchronous motor. Comprising the following steps: taking half of the maximum rotor frequency of a motor as an initial value of first speed search, and applying a voltage vector according to the value of the rotor frequency; constructing a stator voltage frequency calculation model applied by speed search; drawing a curve graph of the change of the stator current along with the rotating speed under the stator voltage rotating at the fixed frequency and a stator current expansion Heyland circle under the stator voltage rotating at the fixed frequency, and constructing a criterion function according to the curve graph; judging the iteration direction of the stator voltage frequency calculation model according to the criterion function; and taking the new rotor frequency obtained by iteration as the stator voltage frequency to be applied in the nth search to perform search calculation and repeated iterative calculation until the search calculation meets a set end condition, outputting the rotor frequency of the motor, and assigning the rotor frequency to the speed observer. According to the invention, belt speed restarting control can be successfully realized under very small current and torque impact.

Description

technical field [0001] The invention belongs to the field of motor control, and more specifically relates to a method and device for initial speed identification and belt speed re-introduction control of an asynchronous motor. Background technique [0002] With the continuous deepening of the country's modernization, the development of rail transit, electric mining vehicles and other fields mainly based on asynchronous motor control has also received various attentions. Among them, the failure of the traction system caused by the failure of the speed sensor occurs from time to time. One of the best ways to solve this problem is to use the speed sensorless control as an alternative or even a mainstream traction solution. In each control system, sometimes the inverter is blocked due to instantaneous fault protection, short-term power failure, etc., so it is inevitable to face the special working condition of "restarting operation with speed". The speed sensorless control syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18H02P21/00H02P21/13H02P25/02
CPCH02P21/18H02P21/0017H02P21/13H02P25/02H02P2207/01
Inventor 李健王浩琢陈泓武
Owner HUAZHONG UNIV OF SCI & TECH
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