Turndown ratio in AC motor speed control

When choosing a motor for a credit card applicatoin, a primary consideration is the speed range it’ll be operated in. When a motor is operate substantially slower than its ranked base speed, numerous potential adverse effects will come into enjoy, including reduced cooling performance, reduced power efficiency and a modify in the motor’s acceleration and torque features. To mitigate this issue, some motors and quickness controllers have been designed especially to drive lots 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 an application operates at a constant speed, the thing that is needed could be a gearbox or acceleration reducer that brings the engine speed down to the required level. However, many applications need the quickness of the engine to be diverse during operation.

This is normally achieved utilizing a VFD or Adjustable Frequency Drive, which controls the speed by modifying the frequency fed to the motor. Deciding on the best speed reducer gearbox electric motor and VFD type depends on a variety of factors, however, it is necessary to 1st look at how the characteristics of a electric motor change when the acceleration is reduced.

A motor usually has a base speed, specific by the product manufacturer, that it can be made to operate at. However, if a engine is managed below the base speed, it may experience reduced performance of the cooling system. Especially with typically used Totally Enclosed Fan Cooled (TEFC) and ODP (Open Drip Evidence) motors, where in fact the cooling program consists mainly of a shaft-mounted lover, a decrease in speed outcomes in reduced airflow over the electric motor and loss of cooling, and heat buildup occurs. Especially when the engine is operated with complete torque at low speeds, heat can easily build up inside the motor to damaging levels.

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