Running torque

When the running torque requirement is high but the starting torque requirement not as high then a... 

General arrangement (b1) Low start but high running torques... 

Apparent viscosity also is used to provide an indication of the directional value of starting and running torques of grease-lubricated mechanisms. Specifications may include limiting values of apparent viscosity for grease to be used at low temperature. 

The first step is determining the load characteristics to which the motor will be matched power, torque, speed, and duty cycle. Starting torque, as well as running torque, must be considered. It may vary from a small percentage to a value several times the full-load torque. The greater the excess torque than that required to start the load, the more rapid the acceleration. 

Stepper Motor — Stepper motors can be used in simple open-loop control systems and are generally suited for systems operated at low acceleration and static load. Closed-loop control may be needed for high dynamic loads, particulariy when loads vary. If a stepper motor in an open-loop control system is overtorqued, all knovdedge of rotor position is lost and the system must be reinitialized. To prevent this, the torque capacity of the stepper motor must not exceed the maximum running torque calculated from ... 

Key application points must be defined in order to properly apply an induction motor to a solid-state adjustable-firequency controller torque, speed range, motor description, and environment. In order to ensure that adequate torque is available to drive the load and adequate current is available to produce the required torque, the starting torque, the peak running torque, and the continuous torque requirements must be defined. The continuous torque is usually defined, but the peak and starting torques are more difficult to define. For the case of retrofit applications, the speed-torque curve of the existing motor mig t be used as... 

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