When choosing a engine for an application, a primary consideration may be the speed range it will be operated in. Whenever a motor is operate considerably slower than its ranked base speed, several 
potential adverse effects may come into enjoy, including reduced cooling performance, reduced power performance and a change in the motor’s quickness and torque features. To mitigate this issue, some motors and velocity controllers have already 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 determined by the frequency of the supply power. When an application operates at a continuous speed, the thing that is necessary may be a gearbox or speed reducer that brings the electric motor speed down to the required level. However, many applications require the speed of the engine 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. Choosing the right electric motor and VFD type depends upon a variety of factors, however, it is necessary to initial look at the way the characteristics of a engine change when the acceleration is reduced.
A motor usually has a base speed, specified by the product manufacturer, that it is made to operate at. However, if a engine is operated below the bottom speed, it could experience reduced performance of the cooling system. Especially with frequently used Totally Enclosed Fan Cooled (TEFC) and ODP (Open Drip Evidence) motors, where the cooling system consists primarily of a shaft-mounted fan, a decrease in speed outcomes in reduced airflow over the motor and loss of cooling, and temperature buildup occurs. Particularly when the motor is operated with full torque at low speeds, heat can easily build up in the motor to harmful levels.
Gearboxes and rate reducers are mechanical velocity reduction equipment found in automation control systems.
Articles regarding speed reducer gearbox are available on our site.