Circuit arrangement for preventing inductive interference in an

Details Circuit arrangement for preventing inductive interference in an Circuit arrangement for preventing inductive interference in an

1989-11-27

1991-06-04

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, 310255, H02P 500

Patent

active

050217259

ABSTRACT:
An arrangement for preventing inductive interference in an electric car having a power receiver for receiving DC power from a feeder line connected to a DC power supply, an inverter connected between the power receiver and a ground side terminal connected to a rail via a wheel for converting the DC power fed from the power supply into AC power, and a motor driven by the output of the inverter, the arrangement being adapted to prevent a high-frequency signal current transmitted from and/or to a signal station from being affected by inductive interference due to switching currents of the inverter flowing from switching elements of the inverter to a return line by way of a capacitance between a frame and a stator winding of the motor. The inductive interference preventive arrangement has a circuit for making the impedance of an electrical circuit extending from the motor frame to the ground side terminal without passing through the rail smaller than that of an electrical circuit extending from the motor frame to the rail by way of wheels driven by the motor.

REFERENCES:
patent: 3866702 (1975-02-01), Eastham
patent: 3940669 (1974-11-01), Tsuboi et al.
patent: 3962612 (1976-06-01), Kawasaki
patent: 4315203 (1982-02-01), Ibamato et al.
patent: 4327313 (1982-04-01), Tsuboi et al.
patent: 4573098 (1986-02-01), Williston
patent: 4799125 (1989-01-01), Crofts et al.
patent: 4825131 (1989-04-01), Nozaki et al.

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