When choosing a electric motor for an application, a primary consideration is the speed range it’ll be operated in. When a motor is operate substantially slower than its ranked base speed, several potential adverse effects will come into enjoy, including reduced cooling effectiveness, reduced power performance and a alter in the motor’s rate and torque features. To mitigate this problem, some motors and speed 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 is determined by the frequency of the supply power. When an application operates at a continuous speed, the only thing that is needed could be a gearbox or velocity reducer that brings the motor speed down to the mandatory level. Nevertheless, many applications need the swiftness of the electric motor to be various during operation.
This is usually achieved using a VFD or Adjustable Frequency Drive, which controls the speed by modifying the frequency fed to the motor. Choosing the right electric motor and VFD type depends on a variety of factors, however, it is necessary to first look at the way the characteristics of a motor change when the quickness is reduced.
A motor usually has a base speed, specific by the manufacturer, that it is made to operate at. However, if a engine is operated below the base speed, it could experience reduced performance of the cooling system. Especially with frequently used Totally Enclosed Enthusiast Cooled (TEFC) and ODP (Open Drip Proof) motors, where in fact the cooling system consists mainly of a shaft-mounted fan, a reduction in speed results in reduced airflow over the electric motor and loss of cooling, and warmth buildup occurs. Particularly when the engine is operated with complete torque at low speeds, heat can easily build up within the motor to harming levels.
Gearboxes and velocity reducers are mechanical velocity reduction equipment found in automation control systems.
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