| 摘要 |
The present invention comprises a motor control system for controlling the speed of an electrical motor in an air temperature control system having a control signal determined in accordance with various loads of the air temperature control system. An electrical energy source provides electrical energy to the control system. A motor starter has a starter input coupled to the electrical energy source and a starter output coupled to the electrical motor for receiving the electrical energy from the electrical energy source and selectably applying the received electrical energy to the electrical motor. An inverter is directly coupled to the starter input and to the starter output to bypass the starter and provide a frequency signal to control the speed of the electrical motor according to the control signal. The motor operates in a high speed mode and in a reduced speed mode wherein the mode of operation of the motor is determined according to frequency signal. Sensors providing the control signal may be temperature sensors for sensing a temperature to be controlled or pressure sensors.
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