Primary and secondary dynamic braking system

Details Primary and secondary dynamic braking system Primary and secondary dynamic braking system

1983-12-27

1984-12-18

Truhe, J. V.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Braking

318 57, 318 60, 318 62, 318 63, 180907, H02P 314

Patent

active

044892560

ABSTRACT:
A dynamic braking system is provided for electrically driven wheelchairs to slow the wheelchairs to a stop without needing to use a mechanical brake. A primary switch arrangement is provided for connecting resistors across the right and left wheelchair motors automatically when the switch control is in its off position, either because of purposely positioning the control by the patient or as a consequence of power failure. In addition, a secondary switching system is automatically actuated in response to the primary switching system being moved to its off position to cross connect or short circuit the terminals of the right and left motors to each other only after a given period of time to provide a secondary braking action to the motors and bring the wheelchair to a complete rest.

REFERENCES:
patent: 1136621 (1915-04-01), Shallcross
patent: 3218537 (1965-11-01), Stamm
patent: 3305712 (1967-02-01), Hoffman
patent: 4157123 (1979-06-01), Rodaway
patent: 4296361 (1981-10-01), Archer
patent: 4369397 (1983-01-01), Read
patent: 4387325 (1983-06-01), Klimo
patent: 4415049 (1983-11-01), Wereb

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