When choosing a electric motor for a credit card applicatoin, a primary consideration is the speed range it will be operated in. Whenever a motor is run substantially slower than its rated base speed, numerous potential adverse effects will come into enjoy, including reduced cooling effectiveness, reduced power performance and a alter in the motor’s quickness and torque characteristics. To mitigate this problem, some motors and rate controllers have already been designed especially to operate a vehicle a load at low speeds with exact 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 continuous speed, the only thing that is necessary may be a gearbox or velocity reducer that brings the engine speed down to the required level. However, many applications require the velocity of the engine to be different during operation.
This is normally achieved using a VFD or Variable Frequency Drive, which controls the speed by modifying the frequency fed to the motor. Choosing the right motor and VFD type depends upon a number of factors, however, it’s important to 1st look at how the characteristics of a motor change when the acceleration is reduced.
A motor usually includes a base speed, specified by the manufacturer, that it can be designed to operate at. Nevertheless, if a engine is operated below the base speed, it may experience reduced performance of the coolant system. Especially with typically used Totally Enclosed Enthusiast Cooled (TEFC) and ODP (Open Drip Evidence) motors, where the cooling program consists mainly of a shaft-mounted enthusiast, a reduction in speed results in decreased 
airflow over the motor and lack of cooling, and warmth buildup occurs. Especially when the engine is operated with complete torque at low speeds, heat can quickly build up within the motor to damaging levels.
Gearboxes and rate reducers are mechanical quickness reduction equipment found in automation control systems.
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