The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 1991
Filed:
Nov. 27, 1989
Yoshiji Jimbo, Katsuta, JP;
Tsutomu Ozawa, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
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.