Vehicle window wiper with three brush motor and speed limiting

Details Vehicle window wiper with three brush motor and speed limiting Vehicle window wiper with three brush motor and speed limiting

1988-12-21

1989-06-27

Ro, Bentsu

Electricity: motive power systems

Periodic, repetitious or successive operations control of...

318491, 318531, 318DIG2, 310219, 388836, H02P 706

Patent

active

048432865

ABSTRACT:
A wiper apparatus using a three brush, permanent magnet motor in which a zener diode has a cathode connected to the low speed brush and an anode connected to the high speed brush. The zener breakdown voltage of the zener diode is chosen so that it reverse conducts during at least some portion of each wipe cycle during operation with the high speed brush on a wet window to limit peak wiper speeds and reduce strain on the wiper mechanism. Variations including a transistor, relay or additional zener diode controlled by the zener diode and connected in parallel therewith provide for reduced current and therefore power dissipation in the zener diode at the expense of somewhat limited speed limiting.

REFERENCES:
patent: 3310722 (1967-03-01), Diello
patent: 3402337 (1968-09-01), Malmborg et al.
patent: 3469166 (1969-09-01), Burby
patent: 3497788 (1970-02-01), Kerrigan et al.

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