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On-line identification system and method of rotor time constant based on magnetic flux estimation

A technology of rotor time constant and time constant, which is applied in the control system, vector control system, electronic commutation motor control, etc., can solve problems such as slip deviation and influence on torque control accuracy, and achieve the improvement effect and improve torque control The effect of precision

Active Publication Date: 2015-09-30
SUZHOU INOVANCE TECH CO LTD
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide an online rotor time constant identification system and method based on magnetic flux estimation for the above-mentioned asynchronous motor that causes slip deviation due to resistance temperature rise and affects torque control accuracy

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  • On-line identification system and method of rotor time constant based on magnetic flux estimation

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Embodiment Construction

[0047] 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.

[0048] The invention uses the actual magnetic field estimated by the magnetic flux as a reference, compares the relationship between the field current decomposition in the control command and the estimated field current decomposition, and uses this as the control quantity to perform online correction on the rotor time constant in real time.

[0049] Because under steady-state conditions, the slip calculated using the current wrong rotor time constant is equal to the slip calculated using the rotor time constant calculated using the actual accurate rotor time constant of the motor. From this we get:...

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Abstract

The invention provides a rotor time constant online identifying system based on a flux estimator. The system comprises a sampling unit, a magnetic field angle calculating unit, a first current converting unit, a second current converting unit, a controlled quantity calculating unit and a time constant calculating unit, wherein the sampling unit is used for sampling the three-phase voltage and three-phase current of the output end of an asynchronous motor; the magnetic field angle calculating unit is used for calculating an estimated magnetic field angle; the first current converting unit is used for acquiring practical exciting current and practical torque current; the second current converting unit is used for acquiring control exciting current and control torque current; the controlled quantity calculating unit is used for calculating a controlled quantity; and the time constant calculating unit is used for calculating and updating a rotor time constant. The invention further discloses a corresponding method. According to the system and method, the rotor time constant is calculated by a relation between estimated magnetic field angle decomposing current and control angle decomposing current, so that the torque control accuracy is increased.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a system and method for on-line identification of rotor time constants based on flux estimation. Background technique [0002] In the rotor field-oriented control of asynchronous motors, if the correct decomposition of torque current and excitation current is to be realized, an accurate rotor time constant must be obtained. The inductance and rotor resistance of the motor can be accurately measured through off-line identification, so that the high-precision rotor time constant can be calculated. [0003] In the existing rotor field-oriented control scheme of the asynchronous machine, the rotor inductance Lr and the rotor resistance Rr of the motor can be measured with high precision through the offline identification method. Then use the formula (1) to calculate the rotor time constant Tr, and use the formula (2) to calculate the slip Wsl through the known rotor time constant Tr and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14
Inventor 何俊辉
Owner SUZHOU INOVANCE TECH CO LTD
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