Calibration technique for variable speed motors

Details Calibration technique for variable speed motors Calibration technique for variable speed motors

G - Physics

01

F

341/91, 318/92

G01F 25/00 (2006.01) F04D 27/00 (2006.01)

Patent

CA 1279915

CALIBRATION TECHNIQUE FOR VARIABLE SPEED MOTORS ABSTRACT OF THE DISCLOSURE A variable speed motor is regulated responsive to the load torque acting on the blower wheel. The load torque acting on the blower wheel is determined by means of a coast down procedure in which the motor is briefly de-energized and the rate of angular change d.omega./dt is determined. The load torque acting on the blower wheel can be determined knowing the moment of inertia and d.omega./dt. The average motor RPM during the coast down is then related to a torque value where an RPM vs. CFM relationship has been empirically determined for that blower wheel. A microprocessor then computes the final motor RPM necessary to achieve the desired air delivery (CFM) using the fan law equations.

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