Permanent magnet motor manufacturers distinguish compare three starting modes of motor

2020-01-19

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Electric motor is a kind of electromagnetic device which can convert transfer electric energy according to the law of electromagnetic induction. If you want to use the motor well, you need to know the common starting mode of the motor. The permanent magnet motor manufacturer will introduce the relevant knowledge to you today.

The commonly used starting modes of motor are: decompression start, soft start, frequency conversion start. The advantages disadvantages between them are as follows:

Decompression start, the common is star delta start, the disadvantage is that the starting torque is small, only suitable for no-load light load start. The advantage is that it's cheap. Soft start can set the start time start initial torque to realize soft start soft stop for the equipment, can limit the starting current, the price is moderate. Variable frequency start, can start smoothly according to the set time, let the equipment run at the set frequency, with high price.

The manufacturers of permanent magnet motor will compare the performance principles of soft start, frequency converter decompression start as follows:

1. Soft starter is the combination of thyristor AC voltage regulation technology power factor control technology. It realizes soft start soft stop of motor through thyristor voltage regulation, without speed regulation function.

2. The frequency converter is a motor control device which uses the on-off function of power semiconductor devices to change the power frequency power supply into another frequency. It is a real high-efficiency speed regulation way to control the motor operation by frequency conversion, with high efficiency. The inverter can realize real soft start, soft stop efficient speed regulation.

3. Generally speaking, two common ways of starting under reduced voltage are autotransformer starting Y-delta starting. The advantage of autotransformer starting is that the starting torque is large. When the winding tap is at 80%, the starting torque can reach 64% of that of direct starting. the starting torque can be adjusted by tap.