Identification method of stator resistance start of induction motor
A technology of stator resistance and induction motor, which is used in the control of generators, motor-generators, and electromechanical brakes. It can solve problems such as difficult engineering implementation, complex algorithms, and unsolved problems.
Active Publication Date: 2019-01-22
SUZHOU WEICHUANG ELECTRICAL EQUIP TECH
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Problems solved by technology
Therefore, the problem of stator resistance variation due to ambient temperature variation remains unsolved
If only the stator resistance learning is carried out before the motor starts, it is often unbearable because it takes several seconds
And for some special occasions, such as elevator equipment, this process may lead to the landing of the equipment
[0005] On-line identification is generally based on the motor model, and observer design is required. The algorithm is complex, the amount of calculation is large, and the engineering implementation is difficult.
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[0064] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0065] A starting identification method for induction motor stator resistance, the steps of which are as follows:
[0066] A. System modeling: In the static coordinate system, establish a current closed-loop control stator resistance identification block diagram as shown in figure 1 As shown, it includes the PI link, the inverter link, the motor link and the current sampling link. The models of each link are as follows:
[0067] (1) Establish the model of the induction motor at rest, including the sequentially connected stator resistance R s , motor stator leakage inductance L ls , the motor rotor leakage inductance L lr and resistor R r , also includes the inductor connected at L lr and resistor R r The motor mutual inductance between L m , also including the applied resistance R s input and resistor R r The voltage u between the out...
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The invention discloses an identification method of stator resistance start of an induction motor. through system modeling, PI parameter tuning, calculating the current correspondence and the voltageresponse to calculate the increment DeltaRs of the stator resistance relative to the off-line identification stator resistance at each start-up and then passing through the final formula Rs1=Rs+DeltaRs, The stator resistance Rs1 at each start-up is obtained. The stator resistance start-up identification method provided by the method is simple and fast, and the low frequency output shortage and stability problems caused by temperature change are eliminated to the maximum extent.
Description
technical field [0001] The invention relates to the technical field of motor control, in particular to a starting identification method for induction motor stator resistance. Background technique [0002] The speed sensorless control system of asynchronous motor needs accurate flux linkage information. The voltage-type flux linkage observer is the simplest method to realize the estimation of motor stator and rotor flux linkage. Its formula is: ψ s =∫(u s -Ri s ) dt. [0003] Stator resistance is the only motor parameter involved in the model, which directly affects the accuracy of field orientation, and is related to the load capacity of the motor at low frequencies and the stability of the vector control system. However, during the operation of the motor, due to the heating of the motor winding and the change of the ambient temperature, the stator resistance will change, thus affecting the control performance. [0004] At present, there are two commonly used stator resi...
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IPC IPC(8): H02P21/14
CPCH02P21/14
Inventor 黎国才骆鹏徐益飞
Owner SUZHOU WEICHUANG ELECTRICAL EQUIP TECH