H - Electricity – 02 – K
Patent
H - Electricity
02
K
74/224, 310/45,
H02K 51/00 (2006.01) H02K 7/00 (2006.01)
Patent
CA 1238102
A VARIABLE SPEED DRIVE Abstract of the Disclosure A variable speed drive including an electric motor having a substantially constant output speed on its output shaft, A first pair of disks carried on the output shaft of the motor with one of the disks being fixed to the output shaft and the other disk being axially adjustable on the output shaft. A second pair of disks is carried on an output drive shaft spaced from the output shaft of the motor and one of the disks of the second pair of disk is fixed to the output drive shaft, the other disk being axially adjustable on the output drive shaft. A belt extends between the first and second pair of disks for driving the output drive shaft responsive to the motor driving its output shaft. A control motor is provided for radially displacing the belt between the two pair of disks for varying the output speed of the output drive shaft. A sensor is provided for generating a frequency signal indicating the output speed of the output drive shaft. A frequency-to-voltage converter is provided for converting the frequency signal to a voltage signal and feeding said signal indicating the actual speed of the output drive shaft to the voltage comparator. A second signal is provided to the voltage comparator indicating the desired output speed of the variable speed drive. The comparator generates a correction signal which is fed through control circuits to a control motor for displacing the belt radially to vary the output speed of the output drive shaft. A dead band circuit is provided for inhibiting the driving of the control motor when the correction signal is within a predetermined amplitude range. Electric circuits are provided for setting maximum and minimum speed adjustment for the variable speed drives.
505603
Balint John J.
Woyton Joseph T.
Gowling Lafleur Henderson Llp
Reliance Electric Company
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