February 21, 2020

When choosing a electric motor for an application, a primary consideration is the speed range it’ll be operated in. Whenever a motor is run considerably slower than its ranked base speed, several potential adverse effects may come into enjoy, including reduced cooling performance, reduced power effectiveness and a modify in the motor’s speed and torque characteristics. To mitigate this issue, 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’s dependant on the frequency of the supply power. When a credit card applicatoin operates at a continuous speed, the only thing that is necessary may be a gearbox or speed reducer that brings the motor speed down to the required level. Nevertheless, many applications need the speed of the motor to be varied during operation.

This is usually achieved utilizing a VFD or Adjustable Frequency Drive, which controls the speed by modifying the frequency fed to the motor. Deciding on the best electric motor and VFD type depends upon a variety of factors, however, it’s important to 1st look at the way the characteristics of a electric motor change when the swiftness is reduced.

A motor usually has a base speed, specified by the manufacturer, that it can be designed to operate at. However, if a motor is operated below the base speed, it may experience reduced performance of the cooling system. Especially with typically used Totally Enclosed Lover Cooled (TEFC) and ODP (Open Drip Proof) motors, where the cooling program consists primarily of a shaft-mounted lover, a decrease in speed outcomes in reduced airflow over the engine and loss of cooling, and high temperature buildup occurs. Especially when the electric motor is operated with complete torque at low speeds, heat can quickly build up inside the motor to harmful levels.
Gearboxes and speed reducers are mechanical velocity reduction equipment found in automation control systems.

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