Electricity: motive power systems – Battery-fed motor systems
Patent
1974-10-08
1976-06-08
Rubinson, Gene Z.
Electricity: motive power systems
Battery-fed motor systems
318338, 318356, H02P 714
Patent
active
039626121
ABSTRACT:
A control device is disclosed for an electric car employing a DC shunt motor, the armature, of which, is connected to a storage battery through a first relay contact and two series resistors shunted by second and third relay contacts second and third relays are energized in turn depending upon a degree of depression of an accelerator pedal, so that an armature terminal voltage is controlled to a plurality of values which are dependent upon the degree of pedal depression, the shunt field coil is connected through a field current control circuit for continuously controlling the field current depending upon a degree of depression of the accelerator pedal. In a preferred embodiment transistors are connected in series with the relays such that transistors are controlled by threshold values of rotational speed of the armature and/or an armature current. Therefore, the energization of the relays and thus of the switching control of the armature terminal voltage is conditioned by an armature rotational speed and/or an armature current. In another preferred embodiment of the present invention, the abovementioned continuous control of the field current is conditioned by a threshold value of armature rotational speed and/or an armature current. In a further preferred embodiment, the abovementioned switching control of the armature voltage and the abovementioned continuous control of the field current are both conditioned by a threshold value of armature rotational speed and/or an armature current.
REFERENCES:
patent: 3628621 (1971-12-01), Lee
patent: 3716768 (1973-02-01), Mason
patent: 3735220 (1973-05-01), Renner et al.
patent: 3811079 (1974-05-01), Tashiro et al.
Daihatsu Motor Co., Inc.
Rubinson Gene Z.
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