Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1983-09-29
1985-07-09
Weldon, Ulysses
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318341, 318345R, H02P 506
Patent
active
045284873
ABSTRACT:
The DC power supply current-collected on the electric car is connected with a series circuit of the armature of a driving DC motor and an armature current control chopper and with a series circuit of a field winding and a field current control chopper.
Both choppers are controlled so that the armature current and field current are maintained constant until the flow rate of the armature chopper reaches the maximum after starting of electric car. In this period of time, the chopping frequency of the armature chopper is higher than that of the field chopper.
When the flow rate of the armature chopper reaches the maximum, the chopping frequency of the armature chopper is made coincident with that of the field chopper. At the same time, the field chopper is switched to the control operation by which the field current is decreased in order that the decrease of the armature current is restricted.
When the speed of the electric car is further increased so that the field current tends to decrease below the weak field limit value, a control system is operated to suppress the tendency and thereafter the field current becomes constant.
The chopping frequencies of both choppers are determined on the basis of a common clock pulse.
REFERENCES:
patent: 3378746 (1968-04-01), Weiser
patent: 3458790 (1969-07-01), Wilkerson
patent: 4099111 (1978-07-01), Inaba et al.
patent: 4233549 (1980-11-01), Dighe
patent: 4247807 (1981-01-01), Wilson
patent: 4322667 (1982-03-01), Ohba
Jimbo Yoshiji
Kotake Kazuyoshi
Hitachi , Ltd.
Weldon Ulysses
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