H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/45
H02P 7/34 (2006.01) H02P 7/00 (2006.01)
Patent
CA 1050103
ABSTRACT OF THE DISCLOSURE A control system for controlling a drive system which has an alternating current generator driven by a prime mover, a rectifier and a direct current motor powered by the rectified output of the generator, has a main control which provides a reference signal for the generator field and a reference signal for the motor field. An energy absorbing device is arranged to be switched into and out of the motor armature circuit. The speed of the motor is sensed to determine deceleration and to determine maximum counter electromotive force (emf) based on speed and maximum motor field. If the maximum counter emf will exceed a predetermined level, the energy absorbing device is the decelerating motor and to avoid excessive current caused by reversal of the motor field when the drive is being stopped or reversed. The control system also includes circuitry which senses armature current, compares it with an armature current reference signal and provides a current control signal. This current-control signal is normally directed to control armature current via the generator field winding. This circuitry also senses a reversal of counter emf and the motor field less than maximum to switch the current control signal from the generator field and direct it to the motor field since during regeneration only the motor field can control the armature current by controll- ing the motor counter emf. When maximum motor field current is achieved the current control signal is switched back to control current in the generator field winding because at this point the counter emf cannot develop full armature current even with maximum motor field. Thus the control system provides for deceleration and permits a controlled maximum torque for reversal without excessive armature current.
242842
Canadian General Electric Company Limited
Na
LandOfFree
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