Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Slipping and/or racing control for electric motors
Patent
1998-03-09
2000-03-28
Nappi, Robert E.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Slipping and/or racing control for electric motors
180 655, B61C 1508
Patent
active
060436174
ABSTRACT:
A variable speed driving apparatus drives a plurality of induction machines that facilitates reducing the deviations of the primary magnetic fluxes of the induction machines from the reference and preventing the torque and rotating speed of each induction machine from lowering in the low speed range or when the loads on the respective induction machines are unbalanced. The variable speed driving apparatus includes an inverter 1, induction machines 2, current detectors 3, speed detectors 4, a reference angular frequency operating device 6 for operating the rotating angular frequency of the induction machine bearing the heaviest load based on the output signals of the speed detectors 4, a first phase difference operating device 7.sub.1, for operating the first phase difference between the secondary side component of a reference current and a primary reference magnetic flux, a first reference slip angular frequency operating device 8.sub.1 , to which the first phase difference is inputted, an adder 12.sub.1, for adding the output of the operating device 8.sub.1, and the output of the operating device 6, an integrator 13 for integrating the output of the adder 12.sub.1, a detected current vector rotating device 5 for converting the output of the current detectors 3 to a q-axis component and a d-axis component based on the output of the integrator 13, a q-axis current regulator 10, a d-axis current regulator 11, and a reference voltage vector rotating device 15.sub.1 for converting the reference d-axis current value and reference q-axis current value to reference three-phase voltage values based on the output of the integrator 13.
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"A Stator Flux Oriented Induction Machine Drive", by Xingyi Xu et al.,, Apr. 1988, Dept. of Electricaland Computer Engineering, I.E.E.E. pp. 870-876.
Matsumoto Yasushi
Mizukami Tetsuya
Osawa Chiharu
Duda Rina I.
Fuji Electric & Co., Ltd.
Nappi Robert E.
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