Drive system for electric cars

Details Drive system for electric cars Drive system for electric cars

1994-03-28

1996-06-18

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 49R, 310114, H02K 720

Patent

active

055280943

ABSTRACT:
A drive system comprises first and second motors for driving an electric car in response to alternating electric currents supplied to their coils. The first and second motors have their respective first and second rotors assembled on a common shaft at angular positions which are shifted by a first predetermined angle in their direction of rotation. Moreover, the first and second motors are energized by currents which are shifted in phase by a second predetermined angle. The first and second predetermined angles are individually determined in advance on the basis of the undesirable torque-fluctuation harmonic and the polar ratio of the motor. As a result, the torque fluctuations of the selected harmonic of the motor frequency of the first and second motors can offset each other to reduce the vibrations due to resonances.

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patent: 5177384 (1993-01-01), Furuki
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