Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Running-speed control
Patent
1996-01-03
1997-04-29
Cabeca, John W.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Running-speed control
318 77, 318 61, 318 48, 318799, 318432, 318 98, H02P 550
Patent
active
056252625
ABSTRACT:
A system having two or more A.C. motors driving the same load. The stator windings and rotors of both motors each conduct current having a vector representative of a magnitude and angular position of the current in the respective rotor and stator winding. Stator current sensors are provided for producing an indication of the magnitude of the stator current vector to each motor. Encoders are provided for sensing the rotating speed of each of the rotors from which can be calculated the angular position of the rotor load current vector with respect to the rotating stator flux current vector. A first torque control controls the magnitude of the stator current of a first one of the motors such that the stator flux current vector of the first motor and the rotor load current vector of the first motor are angularly separated by 90.degree.. This angular relationship produces maximum torque at the rotating speed of the first motor. A second torque control receives an indication of the magnitude of the torque of the first motor from the first torque control. Using this information, the second torque control controls the magnitude of the current of the stator of the second motor such that the angular position of the stator flux current and rotor load current vector of the second motor have a 90 .degree. separation so that the second motor produces substantially the same magnitude of torque as the first motor.
REFERENCES:
patent: 4215305 (1980-07-01), D'atre et l.
patent: 4392100 (1983-07-01), Stanton et al.
patent: 4632222 (1986-12-01), Faig et al.
patent: 5113125 (1992-05-01), Stacey
Cabeca John W.
Harnischfeger Corporation
Ruppin Richard C.
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