Motor powered sound emitter

Details Motor powered sound emitter Motor powered sound emitter

1987-10-28

1989-02-21

Fuller, B. R.

Acoustics

Sound-modifying means

181159, 181161, 181177, 381152, 381156, G10K 1100

Patent

active

048057320

ABSTRACT:
In a sound emitter including an emitting piston powered by a three phase asynchronous electric motor, the torque curve of the motor may be adjusted to suit any temperature, causing variations in the emitted resonance frequency by using a motor having its maximum torque at less than half the maximum speed. This may be done by using an alloy of silicon and aluminum in the rotor winding.

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