Calibration technique for variable speed motors

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

1988-01-13

1989-08-22

Lall, Parshotam S.

Boots, shoes, and leggings

364148, 364510, 165 40, 236 491, 236DIG9, 318254, 318802, 324158MG, G01F 2500, B61D 2700, H02P 534, G05B 1302

Patent

active

048602310

ABSTRACT:
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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