Direct-drive tension device using D.C. motor

Details Direct-drive tension device using D.C. motor Direct-drive tension device using D.C. motor

1994-01-13

1994-11-01

Apley, Richard J.

Exercise devices

Having specific electrical feature

482 99, 482115, 482903, A63B 2100

Patent

active

053603826

ABSTRACT:
This novel invention employs state of the art technology together with a powerful D.C. motor to simulate the effect of the weight stack in an exercise machine. In order to reduce the friction loss and response time, a D.C. motor with a unique transmission mechanism is specially designed to accommodate the requirements of our system. A torque that simulates the weight stack is generated when a current is fed to the coils of the motor. To minimize the power disspation of the controller, an ingenious technique, termed VARIABLE CURRENT SOURCE METHOD, based on switching power supply is used to produce enough current without much power loss. As a result, the `weight` that the user experiences can be varied according to the amount of current the controller produces.

REFERENCES:
patent: 4979733 (1990-12-01), Prud'Hon
patent: 5133545 (1992-07-01), Moschettie et al.
patent: 5178594 (1993-01-01), Wu
patent: 5180348 (1993-01-01), Saarinen

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