Can a regular motor be replaced with an inverter-driven motor?
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Can a regular motor be replaced with an inverter-driven motor? Ordinary motors don’t have separate cooling fans; it should be fine to replace the inverter with an inverter-driven motor. Our 90KW centrifugal fan motors also don’t have separate cooling fans, and they still work just fine
When a regular motor is used as an inverter-driven motor, its service life is significantly reduced, and it’s impossible to know when its insulation will fail. When the rotation speed is less than one-third of the rated speed, the heat dissipation is insufficient, which can cause ordinary motors to overheat and get damaged. For new projects that require speed control, dedicated variable-frequency motors are generally used.
For capacities below 90kw, those with an operating frequency of over 30HZ are suitable; for others, variable-frequency motors are required
It depends on how it is used. If it is used too infrequently (meaning high torque and high current), heat dissipation becomes difficult; on the other hand, if it is used too frequently, high rotational speeds can affect the lifespan of components such as bearings (as these devices are designed for normal motor usage). So, if the conditions are right, it’s not necessary to replace it
We have been using frequency converters for our ordinary motors with a power rating of 150 KW or less for almost 20 years, and no problems have arisen
It can be changed, but the frequency must be above 30HZ to be used
Even with an additional independent fan, efficiency will decrease, heat generation will increase, insulation is prone to aging, and the lifespan will be reduced. Of course, it’s not that they can’t be used; those with lower power would be better. Those with higher power are more likely to break. Variable-frequency motors differ in terms of structural design and the choice of insulation materials.
It can be used, but it cannot operate at low frequencies for long periods of time; otherwise the fan may burn out due to its low speed. However, it’s not necessarily required to operate at a frequency of over 30Hz as mentioned above.
It is generally sufficient not to operate at low frequencies, but the insulation performance of ordinary motors is much lower than that of variable-frequency motors, as inverters generate high-order harmonics: lol