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With a VFD, the motor speed can be varied to match the material flow requirements and energy can be saved. Speed Variation: Beyond energy usage, applications such as conveyors, crushers and grinding mills can use the motor and VFD packages to provide optimal speed variation. In some cases the operating speed range can be wide, which a motor applied with a constant frequency power source .

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Motor torque, load torque and selection of motors 2/43 2.1 Motor speed–torque curve Refer to Figure 2.1 where T st = starting torque or breakaway torque. T m = minimum, pull-in or pull-up torque. T po = pull-out, breakdown or maximum torque, obtainable over the entire speed range. In a good design this should occur as close to the rated slip ...

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