Problems that must be clarified in the use of the motor

Problems that must be clarified in the use of the motor

The motor is the most frequently used rotating tool so far. With the development and popularization of the frequency converter, more and more motors need to be used together with the frequency converter, but inevitably in the process of using the inverter and the motor. Encountered a lot of problems, these exposed problems are more and more worthy of our thoughts and exchanges.

1. Can the motor soft starter save energy?

The soft start energy saving effect is limited, but it can reduce the impact of starting on the power grid, and can also achieve smooth start and protect the motor winding.

According to the theory of energy conservation, due to the addition of a relatively complicated control circuit, soft start not only does not save energy, but also increases energy consumption, but it can reduce the starting current of the circuit and play a protective role.

2. What is the starting current and starting torque of the motor when the inverter is running?

The inverter is operated, and the frequency and voltage are increased correspondingly with the acceleration of the motor. The starting current is limited to 150% of the rated current (125% to 200% depending on the model). When starting directly with the commercial frequency power supply, the starting current is 6 to 7 times, so mechanical and electrical impact will occur. It can be started smoothly with the inverter drive (starting time becomes longer). The starting current is 1.2~1.5 times of the rated current, and the starting torque is 70%~120% of rated torque. For the inverter with automatic torque boosting function, the starting torque is 100% or more, and it can start with full load.

3. What is the connection between the overload and short circuit of the motor?

There are two kinds of overload of the motor; 1. It is mechanical load overload: it is the overload of the driven load exceeding the rated value or the transmission system is stuck, which has nothing to do with the short circuit. 2. The load is normal: the motor current is overloaded. This may be caused by a partial short circuit between the motor windings and the turns.

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