Suppression of radio frequency emissions
AssigneeControl Techniques Limited
InventorColin Hargis
Life of this patent
Estimating the term…
Abstract
For the suppression of radio frequency emissions from an electrical drive comprising an electric motor supplied with electrical power via an electronic controller having a high speed switching device which generates high frequency energy, an electrical screen is provided to receive the radio frequency energy and is connected back to the input side of the high speed switching device.
Claims26
A method for the suppression of radio frequency emissions from an electrical drive comprising an electronic controller comprising high speed switching means which generates high frequency energy and an electric motor to which power from a source of electrical power is supplied via said electronic controller, said method comprising providing an electric screen to receive radio frequency energy which, in use, is emitted from at least a part of the electrical drive;
- and electrically connecting said electrical screen back to a non-grounded position at an input side of said switching means.
An electrical drive comprising at least a part which emits radio frequency energy, said electrical drive comprising an electronic controller comprising high speed switching means which generates high frequency energy, said switching means having an input side, an electric motor to which power from a source of electrical power is supplied via said electronic controller, and an electrical screen connected back to a non-grounded position at said input side of said switching means for receiving the radio frequency energy emitted by part of said electrical drive.
An electric motor comprising motor windings and a remaining structure, an electrical screen positioned between the motor windings and the remaining structure of the motor, said electrical screen being receptive to radio frequency energy emitted by the motor windings, a non-grounded electrically conductive connection means connected to said electrical screen, and electrical insulation means between said electrical screen and said remaining structure of the motor to electrically insulate said non-grounded connection means from said remaining structure of the motor.
Dependencies are inferred from the claim text.