When choosing a electric motor for an application, a primary consideration may be the speed range it’ll be operated in. Whenever a motor is operate substantially slower than its rated base speed, several potential adverse effects will come into enjoy, including reduced cooling effectiveness, reduced power efficiency and a modify in the motor’s quickness and torque features. To mitigate this issue, some motors and speed controllers have been designed especially to operate a vehicle lots at low speeds with exact control.

Most domestic and industrial motor applications use 3-phase asynchronous induction motors, which operate at a speed that is dependant on the frequency of the supply power. When an application operates at a constant speed, the thing that is required may be a gearbox or rate reducer that brings the motor speed down to the required level. However, many applications need the speed of the electric motor to be different 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 motor and VFD type depends on a number of factors, however, it is necessary to 1st look at the way the characteristics of a motor change when the rate is reduced.

A motor usually includes a base speed, specified by the product manufacturer, that it is definitely made to operate at. However, if a engine is managed below the bottom speed, it may experience reduced efficiency of the cooling system. Especially with typically used Totally Enclosed Lover Cooled (TEFC) and ODP (Open Drip Proof) motors, where the cooling system consists mainly of a shaft-mounted enthusiast, a reduction in speed results in reduced airflow over the electric motor and lack of cooling, and heat buildup occurs. Especially when the electric motor is operated with full torque at low speeds, heat can quickly build up within the motor to damaging levels.
Gearboxes and quickness reducers are mechanical speed reduction equipment used in automation control systems.

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