Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1995-03-31
1997-07-22
Martin, David S.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318811, 482 54, H02P 534
Patent
active
056507097
ABSTRACT:
A variable speed AC motor control drive system for use in devices such as treadmills and including a module to sense the voltage of the line voltage provided to the system and adjusting the pulse width modulated signals provided to the AC motor in response thereto as well as providing a module for sensing the load placed on the AC motor by monitoring the bus voltage of the system and providing a signal representative of the load such that the duty cycles of the pulse width modulated signals are varied in accordance with the line voltage of the system and the load on the AC motor to maintain the desired motor speed.
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Hass Lester A.
Pipinich Victor
Rotunda John T.
Allison Richard D.
Martin David S.
Quinton Instrument Company
Smith Montgomery W.
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