Control circuit for shaded-pole motor
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United States of America Patent
Stats
-
Apr 21, 1987
Grant Date -
N/A
app pub date -
Mar 25, 1985
filing date -
Mar 25, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control circuit for shaded-pole motors used in an acoustic pulsato system for producing special musical effects. The system includes a horn-type loudspeaker connected to a shaded-pole motor and/or a drum-type loudspeaker connected to a shaded-pole motor. Each type of loudspeaker has a feedback circuit and a means for the operator to select the desired speed for the motor. The feedback circuit quickly adjusts the actual speed of the motor to correspond to the selected speed by controlling the amount of current or power supplied to the motor. The drum-type loudspeaker feedback circuit also includes a braking circuit to quickly stop the motor and the drum rotation to prevent unpleasant spurious signals which occur if the drum loudspeaker is permitted to coast to a stop on a slower speed.
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