Non destructive runaway protection for an electric motor

Details Non destructive runaway protection for an electric motor Non destructive runaway protection for an electric motor

1997-03-27

2000-03-28

Richman, Glenn E.

Exercise devices

Involving user translation or physical simulation thereof

Treadmill for foot travel

482 4, 482 7, 482900, 318 1, A63B 2300

Patent

active

06042513&

ABSTRACT:
A runaway protection mechanism is provided which is truly nondestructive in nature and which is highly advantageous for an electric motor used in, for example, an exercise treadmill for driving its moving treadmill belt. In use, the electric motor is connected to an electric power source, such as an alternating-current wall outlet. The runaway protection mechanism includes a disconnect mechanism for disconnecting the motor from the electric power source and thereby deenergizing the motor. The runaway protection mechanism further includes a safety mechanism for comparing the actual motor speed with a desired motor speed and activating the disconnect mechanism when the actual speed exceeds the desired speed by a predetermined amount. In this manner, an orderly and nondestructive shutdown of the motor is accomplished when a fault condition is recognized.

REFERENCES:
patent: 5571062 (1996-11-01), Saganovsky

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