When choosing a motor for a credit card applicatoin, a primary consideration may be the speed range it’ll be operated in. Whenever a motor is operate considerably slower than its rated base speed, several potential adverse effects will come into perform, including reduced cooling effectiveness, reduced power efficiency and a change in the motor’s rate and torque features. To mitigate this problem, some motors and quickness controllers have been designed especially to operate a vehicle 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 thing that is required could be a gearbox or speed reducer that brings the engine speed down to the mandatory level. Nevertheless, many applications need the speed of the engine to be diverse during operation.
This is normally achieved using a VFD or Adjustable Frequency Drive, which controls the speed by modifying the frequency fed to the motor. Selecting the most appropriate 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 speed is reduced.
A motor usually has a base speed, specific by the product manufacturer, that it is certainly designed to operate at. However, if a engine is operated below the bottom speed, it could experience reduced performance of the coolant system. Especially with commonly used Totally Enclosed Fan Cooled (TEFC) and ODP (Open Drip Evidence) 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 loss of cooling, and high temperature buildup occurs. Particularly when the motor is operated with complete torque at low speeds, heat can quickly build up inside the motor to damaging levels.
Gearboxes and acceleration reducers are mechanical speed reduction equipment used in automation control systems.
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