Many engineers assume that the inverter and gearmotor must operate within the 60Hz threshold. Some think that going to a high speed above 60Hz may cause the motor to overheat. But in reality, stopping at 60Hz may actually cause the motor to overheat at a low speed.
With a carefully designed drive system and correct ratio, pushing the operating frequency above 60Hz is possible using one of two proven control methods - field weakening or supercharging. Both methods are discussed in detail, along with technical charts and formulas. Through a common conveying example, the paper demonstrates how to properly select a gearmotor that will significantly enhance performance in the following ways:
- Increase stability by reducing inertia mismatch
- Widen the available speed range
- Eliminate a costly ventilator fan at low speed
- Eliminate motor overheating at low speed
- Enable the use of a smaller motor
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