Electricity: motive power systems – Braking – Dynamic braking
Patent
1998-09-23
2000-06-27
Masih, Karen
Electricity: motive power systems
Braking
Dynamic braking
318138, 318254, 318798, 318803, 318811, 318808, H02P 318
Patent
active
060810866
ABSTRACT:
Converter-powered electric motors are often braked by electrical means. For this purpose the electronic converter that powers the motor is so controlled that the motor, when in generational operation, sends energy by way of the converter into an electrical braking resistor additionally connected to the converter, and this energy is there converted to heat. In order to avoid overloading the electrical braking resistor, an additional electronic or thermo-mechanical protective device is customarily provided. To simplify the arrangement, it is proposed in the present invention to provide as an electric braking resistor one made of a resistive material with a conductance that decreases progressively as the temperature rises through a certain range below the maximal acceptable operating temperature of the braking resistor. As a result, the power that can be accepted by the electrical braking resistor is made self-limiting, so that the braking resistor is protected against overheating.
REFERENCES:
patent: 3715642 (1973-02-01), Walter
patent: 4163181 (1979-07-01), Farber
patent: 4638397 (1987-01-01), Foley
patent: 4649736 (1987-03-01), Austin
patent: 5193388 (1993-03-01), Kleinhans
patent: 5847533 (1998-12-01), Hakala et al.
Roth-Stielow Jorg
Schmidt Josef
Masih Karen
Sew-Eurodrive GmbH & Co.
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