Emerson Electric Company

Craig Nordby

James L Skinner

John S Thorn

Joseph Gerald Marcinkiewicz

Joseph G Mercinkiewicz

John Stephen Thorn

A drive apparatus for use with a dynamoelectric machine system includes drive means connected to the dynamoelectric machine to control at least one of the current or voltage of the machine and a processor including a microcontroller for supplying machine control information to the drive means. A plurality of switches are connected to the processor and art positionable in a plurality of switch settings. Preselected switch settings correspond to operating characteristic information associated with corresponding versions of a given appliance, such that a user positions the switches in a desired switch setting to select the corresponding version of the given appliance. The microcontroller is programmed to read the switch setting and in response thereto, obtain the system operating characteristic information corresponding to the selected version of the given appliance from said second memory so as to permit the system to be used in different versions of the given appliance.

Reprogrammable motor drive and control therefore

Air handling apparatus (10) for delivering a volume of air at a generally constant flow rate regardless of changes in the operating conditions of a system with which the apparatus is used. A blower (12) pushes air from one point to another. The blower is operated by a blower motor (14). A switch (16) controls application of power to the motor. Sensors (20) are used to sense the voltage supplied to the motor, the current drawn by the motor, and the motor's operating speed. A flow controller (22) establishes a desired air flow rate to be provided by the blower. A processor (18) is responsive to the sensed voltage (V), current (I), and speed (S), an input (C) from the flow controller, and constants (K1-K4) related to performance characteristics of the blower to determine a torque required by the motor to produce a predetermined air flow rate. The torque value is determined as a function of the combined motor speed input from the sensor and an input from the flow controller. The processor is responsive to a calculated torque value for the motor. The processor supplies a control signal to the switch to control application of a voltage to the motor. This voltage is sufficient for the motor to produce the calculated torque. The processor includes feedback (28) by which the control signal can be modified first in response to the sensed current drawn by the motor; and additionally, by the voltage supplied to the motor.

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St. Louis, MO, United States of America

Craig Nordby