When choosing a motor for an application, a primary consideration may be the speed range it’ll be operated in. When a motor is run substantially slower than its ranked base speed, numerous potential adverse effects will come into enjoy, including reduced cooling effectiveness, reduced power efficiency and a modify in the motor’s velocity and torque characteristics. To mitigate this issue, some motors and velocity controllers have been designed especially to drive 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’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 swiftness reducer that brings the electric motor speed down to the required level. Nevertheless, many applications need the quickness 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 motor and VFD type depends on a variety of factors, however, it’s important to initial look at the way the characteristics of a engine change when the speed is reduced.
A motor usually includes a base speed, specific by the product manufacturer, that it can be designed to operate at. Nevertheless, if a motor is operated below the bottom speed, it could experience reduced efficiency of the coolant system. Especially with frequently 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 reduction in speed results in decreased airflow over the motor and loss of cooling, and heat buildup occurs. Particularly when the electric motor is operated with full torque at low speeds, heat can easily build up in the motor to harming levels.
Gearboxes and speed reducers are mechanical speed reduction equipment used in automation control systems.
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