Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1994-07-06
1995-08-22
Martin, David S.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318802, 318432, H02P 528
Patent
active
054443512
ABSTRACT:
A system and method for controlling an induction motor which basically achieve reductions in a steady state loss and in a transient loss of the induction motor such as a stepwise input of a torque instruction value T.sub.e *. Basically, a steady-state loss minimization magnetic flux calculating section calculates a secondary (rotor) magnetic flux .phi..sub.r * which minimizes the steady-state loss of the induction motor in response to a torque instruction value. A target magnetic flux .phi..sub.r and a differentiation of the target magnetic flux d.phi..sub.r /dt are thereafter calculated using a low pass filter transfer function such as .phi..sub.r =.phi..sub.r * 1/(1+.tau..sub..phi..S)(, wherein .tau..sub..phi. denotes a time constant, and S denotes a Laplace operator). A target torque T.sub.m is calculates using a predetermined transfer function in response to the torque instruction value such as T.sub.m =T.sub.e *.1/(1+.tau..sub.T.S)(, wherein .tau..sub.T is a time constant for the target torque). At the steady state, the slip frequency .omega..sub.se is set to a loss minimization slip frequency .omega..sub.se-opt and, at the transient state, a magnetic flux response gives an optimum value corresponding to a torque response described above. The induction motor is used to drive an electric motor-driven vehicle.
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patent: 4023083 (1977-05-01), Plunkett
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patent: 4243927 (1981-01-01), D'Atre
patent: 4459534 (1984-07-01), Nagase et al.
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patent: 5212438 (1993-05-01), Miyazaki et al.
Ishikawa Yasuki
Kitajima Yasuhiko
Nojiri Hidetoshi
Okura Kazuma
Yamamura Yoshinori
Martin David S.
Nissan Motor Co,. Ltd.
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