When choosing a engine for a credit card applicatoin, a primary consideration may be the speed range it will be operated in. When a motor is run substantially slower than its rated base speed, a number of potential adverse effects will come into enjoy, including reduced cooling efficiency, reduced power effectiveness and a alter in the motor’s quickness and torque characteristics. To mitigate this problem, some motors and velocity 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 determined by the frequency of the supply power. When a credit card applicatoin operates at a continuous speed, the only thing that is required could be a gearbox or quickness reducer that brings the electric motor speed down to the required level. However, many applications require the rate of the electric motor to be different during operation.
This is generally achieved using a VFD or Adjustable Frequency Drive, which controls the speed by modifying the frequency fed to the motor. Selecting the most appropriate 
engine and VFD type depends upon a number of factors, however, it’s important to first look at the way the characteristics of a motor change when the velocity is reduced.
A motor usually has a base speed, specified by the manufacturer, that it is certainly made to operate at. However, if a engine is operated below the bottom speed, it may experience reduced effectiveness of the coolant system. Especially with commonly used Totally Enclosed Fan Cooled (TEFC) and ODP (Open Drip Proof) motors, where in fact the cooling program consists mainly of a shaft-mounted lover, a decrease in speed results in reduced airflow over the engine and lack of cooling, and warmth buildup occurs. Especially when the engine is operated with complete torque at low speeds, heat can easily build up within the motor to harming levels.
Gearboxes and acceleration reducers are mechanical speed reduction equipment found in automation control systems.
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