When choosing a electric motor for a credit card applicatoin, a primary speed reducer gearbox consideration may be the speed range it’ll be operated in. Whenever a motor is operate substantially slower than its ranked base speed, numerous potential adverse effects will come into enjoy, including reduced cooling performance, reduced 
power performance and a change in the motor’s acceleration and torque characteristics. To mitigate this problem, some motors and swiftness controllers have already been designed especially to drive lots at low speeds with specific control.
Most domestic and industrial motor applications use 3-phase asynchronous induction motors, which operate at a speed that is 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 rate reducer that brings the electric motor speed down to the mandatory level. Nevertheless, many applications need the swiftness of the motor to be different during operation.
This is normally achieved utilizing a VFD or Variable Frequency Drive, which controls the speed by modifying the frequency fed to the motor. Choosing the right engine and VFD type depends upon a variety of factors, however, it is necessary to first look at how the characteristics of a electric motor change when the speed 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 managed below the base speed, it may experience reduced effectiveness of the cooling system. Especially with commonly used Totally Enclosed Fan Cooled (TEFC) and ODP (Open Drip Proof) motors, where the cooling system consists mainly of a shaft-mounted enthusiast, a reduction in speed outcomes in decreased airflow over the electric motor and loss of cooling, and heat buildup occurs. Especially when the motor is operated with complete torque at low speeds, heat can easily build up in the motor to harmful levels.