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If I want to run a gearmotor at around 20rpm, should I pick a gear ratio such that the motor operates at low speeds, middle speeds, or high speeds? Which is more efficient?
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For an AC speed control motor, running at the rated speed of the AC motor is most efficient.For any BLDC motor, you must look at the current vs. torque curves. At lower speeds, you will draw less current. So from a heat generation and energy conservation standpoint, you would choose for the motor to operate at slower speeds. Higher speeds, however, yield a better speed regulation.
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Looking at your variable speed motors and controllers, the input voltage can be Single Phase 110/115 or 220/230 or Three Phase 200/220/230 VAC. What is the motor input voltage for those, and what type of motors do I need in order to use my own VFD?
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The controller input can be varied but the input voltage to the motor is controlled by the dedicated controller. The input voltage is different depending on the type of the system. Using a different manufacturers VFD is not encouraged since the motor performance cannot be guaranteed. However, if you have to use a different manufacturer’s VFD, the three Phase AC motors is needed.
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