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Method for determining optimal time constant of three-phase asynchronous motor rotor

A technology of optimal time and determination method, applied in the control of generator, motor generator control, electronic commutation motor control, etc., can solve the problems of complex algorithm, inaccurate time constant, etc. Effect

Active Publication Date: 2014-04-16
SHENZHEN HANGSHENG ELECTRONICS
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Problems solved by technology

[0005] In order to solve the technical problem that the time constant measured and calculated by the existing three-phase asynchronous motor rotor time constant method is inaccurate or the algorithm is too complicated, the present invention proposes a method for determining the optimal time constant of the three-phase asynchronous motor rotor

Method used

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  • Method for determining optimal time constant of three-phase asynchronous motor rotor
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  • Method for determining optimal time constant of three-phase asynchronous motor rotor

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0047] like figure 1 As shown, the control of the cast copper rotor asynchronous motor needs to give the appropriate excitation current and torque current. Before the magnetic field reaches saturation, the excitation current can be increased to increase the effect of the magnetic field. Under the same torque current, the torque can be increased output. However, as the excitation current increases, the magnetic field will enter a saturated state. At this time, the increase of the excitation current will inevitably cause the inverter voltage to enter the saturation stage in advance. It is necessary to reduce the inverter voltage by weakening the field in advance, so it is necessary to The field current is limited by using the attached figure 1 The current matching relationship, I m Indicates the optimal excitation current.

[0048] as attache...

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Abstract

The invention provides a method for determining an optimal time constant of a three-phase asynchronous motor rotor. The method includes the step s11 of setting a rotor time constant reference value tau[r]_ref, the step s12 of selecting an excitation current value id and a corresponding torque current value iq, wherein at the moment, iq=id; the step s13 of calculating the slip ratio Ws=iq / (tau[r]_ref*id) at the moment, the step s14 of conducting vector control, the step s15 of judging whether the torque progressively increases or not, the step s16 of enabling tau[r]_ref to be equal to tau[r]_ref plus delta tau[r] if the torque progressively increases, and executing the step s13 again, wherein delta tau[r] is the increment; the step s17 of determining the optimal time constant tau[r] which is equal to tau[r]_ref if the torque does not progressively increase. According to the method, the defects in the prior art are overcome, the executing efficiency of software is improved, the characteristics of parameter dynamic changes is also taken into consideration, and the method can be easily achieved in terms of projects under the condition that efficient output of a system is ensured.

Description

technical field [0001] The invention relates to a method for determining the optimal time constant of a rotor of a three-phase asynchronous cast copper rotor motor. Background technique [0002] Three-phase asynchronous motor, as the traction motor of electric vehicles, will occupy a place in the field of electric vehicles in the future due to its advantages of stable performance and low cost. However, its efficiency is often lower than that of permanent magnet synchronous motors of the same power level, so improving the efficiency of the entire control system of asynchronous motors has become the focus of attention in the industry. [0003] A very critical parameter in the process of vector control of asynchronous motor is the rotor time constant. The rotor time constant is directly involved in the calculation of the slip, and the slip is indispensable for calculating the synchronous angle. At the same time, it is a very important parameter to determine the output torque o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 郑春阳姚伟科
Owner SHENZHEN HANGSHENG ELECTRONICS
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