Turndown ratio in AC motor speed control

When choosing a electric motor for a credit card applicatoin, a primary consideration is the speed range it will be operated in. When a motor is operate considerably slower than its rated base speed, a number of potential adverse effects will come into play, including reduced cooling effectiveness, reduced power effectiveness and a modify in the motor’s quickness and torque features. To mitigate this issue, some motors and quickness controllers have already been designed especially to operate a vehicle 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’s dependant on Sprockets Gearbox And Chain TMR Feeder Mixer 1the frequency of the supply power. When an application operates at a continuous speed, the thing that is necessary may be a gearbox or swiftness reducer that brings the engine speed down to the required level. Nevertheless, many applications need the velocity of the electric motor to be various during operation.

This is usually achieved using a VFD or Adjustable Frequency Drive, which controls the speed by modifying the frequency fed to the motor. Selecting the most appropriate electric motor and VFD type depends upon a variety of factors, however, it is necessary to 1st look at how the characteristics of a engine change when the speed is reduced.

A motor usually includes a base speed, specific by the manufacturer, that it is certainly made to operate at. Nevertheless, if a motor is operated below the bottom speed, it may experience reduced effectiveness of the coolant system. Especially with generally used Totally Enclosed Enthusiast Cooled (TEFC) and ODP (Open Drip Proof) motors, where the cooling system consists primarily of a speed reducer gearbox shaft-mounted lover, a reduction in speed outcomes in reduced airflow over the engine and loss of cooling, and warmth buildup occurs. Particularly when the electric motor is operated with complete torque at low speeds, heat can quickly build up inside the motor to damaging levels.



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