Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1994-10-06
1996-01-16
LaBalle, Clayton E.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 68R, 318459, H02K 1100, H02K 714, H02P 706
Patent
active
054850428
ABSTRACT:
The invention provides a motor drive unit for use in conjunction with an atherectomy device which limits the torque exerted on a drive cable for rotating a cutting blade in the device. In a preferred embodiment, a motor drive unit includes a motor having a shaft coupled to the drive cable for rotating the cutting blade, a power supply coupled to the motor and a switch for selectively connecting the power supply to the motor. A torque control circuit connected to the power supply and the motor controls the torque exerted by the motor when the switch is closed, whereby the current to the motor is continuously increased from zero to a start-up level, the start-up level being the minimum current sufficient to turn the cutting blade. Usually, the torque control circuit will include a resistor and a capacitor connected to a power supply in parallel with the motor, wherein a gradually decreasing portion of current from the battery is diverted through the RC circuit to charge the capacitor such that the current to the motor is at the start-up level when the capacitor is charged. The motor drive unit further includes a power MOSFET for discharging the capacitor when the switch is opened to reset the circuit.
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Devices for Vascular Intervention, Inc.
LaBalle Clayton E.
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