Microprocessor controlled single phase motor with external rotor having integral fan

DETAILED DESCRIPTION It is, therefore, desirable that the invention provide a single phase motor which is microprocessor controlled and which is simple in design and low in cost to manufacture.
It is also desirable that the invention provide a single phase microprocessor controlled motor which is programmable and which has a relatively small number of components.
It is also desirable that the invention provide a single phase microprocessor controlled motor which is programmed to reduce or avoid operation at speeds at which resonance occurs.
It is also desirable that the invention provide a single phase microprocessor controlled motor for driving a fan which provides an alarm in the event that the static pressure of the air moved by the fan is unacceptable.
It is also desirable that the invention provide a single phase microprocessor controlled motor which employs a simple, low cost and reliable power switching network.
It is also desirable that the invention provide a single phase microprocessor controlled motor which has a start mode during which the rotor is accelerated at a desired rate while limiting the maximum current in the motor.
It is also desirable that the invention provide a single phase microprocessor controlled motor which employs a restart mode which is initiated when a locked rotor is detected.
It is also desirable that the invention provide a single phase microprocessor controlled motor which has constant commutation periods in its normal operating mode.
It is also desirable that the invention provide a single phase microprocessor controlled motor for driving a fan which has a safe operating area avoiding overtemperature operation without current sensing.
It is also desirable that the invention provide a single phase microprocessor controlled motor which employs a simple, low cost, low loss, current limiting power supply.
It is also desirable that the invention provide a single phase microprocessor controlled motor for driving a fan which may be programmed for multispeed operation or which may be programmed as part of an automatic condenser control