Motors and Motor Control
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| Motors and Motor Control |
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Most motors turn at nearly constant speed. However, much of the time the devices they drive may operate at less than maximum design speed. This speed reduction can be accommodated by an Motor Control that varies the shaft speed to the driven load. Slowing a pump or fan in this manner reduces energy consumption much more effectively than allowing the motor to run at constant speed and then restricting or bypassing the flow with a valve or damper. In addition to providing speed control, Motor Control provides soft starting, whereby a motor starts slowly and then speeds up. This reduces the mechanical stress on both the motor and equipment driven by the motor. This also reduces the voltage sag that can occur when a large motor starts quickly. Voltage sags can dim lights and cause other equipment to shut down or restart. |