Patent ID: 6081086
Filing Date: 2000-06-27
Classification: B60L,H02P,Y02T

Abstract:
An apparatus for the electrical braking of an electric motor powered by a converter, comprising:an electrical braking resistor with a resistance which does not increase during the resistor's normal operating temperature range, but which increases as the temperature of the resistor gets closer to its maximum acceptable operating temperature so that the resistor's resistance becomes so high that any power reasonably expected to be applied to the resistor will not damage the resistor; anda control means for controlling the power deliverable to the braking resistor;wherein the converter comprises a d.c. intermediate circuit to which the control means is connected; andwherein the control means comprises an electronic on-off switchable, one-way valve connected in series with an oppositely oriented diode to which the braking resistor is connected in parallel and to which an output voltage of the d.c. intermediate circuit is applied.