Induction motor breakdown slip prediction for propulsion tractio

Details Induction motor breakdown slip prediction for propulsion tractio Induction motor breakdown slip prediction for propulsion tractio

1996-08-28

1998-02-24

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318811, H02P 5415

Patent

active

057214794

ABSTRACT:
A method of controlling an inverter to provide protection for an AC traction motor includes starting the inverter and estimating a rotor cage resistance. A slip limit command is calculated from the estimated rotor cage resistance and used to control the inverter. Calculating the slip limit command can include determining a first slip limit using the rotor cage resistance, a stator leakage inductance, a rotor leakage inductance, a magnetizing leakage inductance, a number of motor poles, and a fundamental frequency of a voltage applied to the motor; determining a second slip limit using a predetermined maximum slip limit, a predetermined minimum slip limit, and a switch dependent on initial flux build up conditions; and calculating the slip limit command as the lower of the first and second slip limits. Using the slip limit command to control the inverter can include calculating a motor torque limit from the plurality of estimated temperatures; estimating a vehicle speed of a vehicle powered by the motor; using the slip limit command, the motor torque limit, the vehicle speed, and a predetermined maximum speed to determine a torque regulator slip positive limit; and providing a signal comprising the lower of the motor torque limit and the torque regulator slip positive limit to an inverter controller.

REFERENCES:
patent: 4629035 (1986-12-01), Tanahashi et al.
patent: 4672288 (1987-06-01), Abbondanti
patent: 5278485 (1994-01-01), Kim
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patent: 5446362 (1995-08-01), Vanek et al.
patent: 5480220 (1996-01-01), Kumar
"Alternating Current Machines" by M. Liwschitz-Garik, et al, Second Edition, Apr. 1961, p.144.
"Induction Machines" By Phillip L. Alger, Second Edition, 1970, pp. 152-157 .

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