Turndown ratio in AC motor speed control

When choosing a electric motor for a credit card applicatoin, a primary consideration is the speed range it'll be operated in. When a motor is operate speed reducer gearbox substantially slower than its rated base speed, several potential adverse effects may come into perform, including reduced cooling effectiveness, reduced power performance and a modify in the motor’s speed and torque features. To mitigate this issue, some motors and speed controllers have already been designed especially to drive a load at low speeds with specific control.

Most domestic and commercial motor applications use 3-phase asynchronous induction motors, which operate at a speed that's determined by the frequency of the supply power. When a credit card applicatoin operates at a constant speed, the only thing that is required could be a gearbox or quickness reducer that brings the motor speed down to the required level. However, many applications need the swiftness of the electric motor to be different during operation.

This is normally achieved using a VFD or Adjustable Frequency Drive, which controls the speed by modifying the frequency fed to the motor. Selecting the most appropriate motor and VFD type depends upon a number of factors, however, it's important to initial look at the way the characteristics of a engine change when the speed is reduced.

A motor usually includes a base speed, specified by the manufacturer, that it is certainly made to operate at. Nevertheless, if a electric motor is managed below the bottom speed, it may experience reduced performance of the coolant system. Especially with frequently used Totally Enclosed Lover Cooled (TEFC) and ODP (Open Drip Proof) motors, where the cooling system consists mainly of a shaft-mounted lover, a decrease in speed results in decreased airflow over the electric motor and lack of cooling, and temperature buildup occurs. Particularly when the electric motor is operated with complete torque at low speeds, heat can quickly build up inside the motor to damaging levels.

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