Constant-power output intelligent frequency modulating and speed regulating frequency conversion system and control method thereof

Abstract

The invention provides a constant-power output intelligent frequency modulating and speed regulating frequency conversion system and a control method thereof. The system comprises a master control device, a PWM control device, an AC / DC circuit, a DC / AC circuit, a protection circuit, a current detecting circuit and a voltage detecting circuit. The AC / DC circuit and the DC / AC circuit are connected with the PWM control device. The protection circuit is connected with the DC / AC circuit. The protection circuit, the current detecting circuit and the voltage detecting circuit are connected with the master control device. The DC / AC circuit, the current detecting circuit and the voltage detecting circuit are connected with a motor. Optimal efficiency can be achieved for the motor, the temperature rise of the motor and the temperature rise of a frequency converting control device are controlled, and therefore the constant-power output intelligent frequency modulating and speed regulating frequency conversion system and the control method have the advantages that energy can be saved, consumption can be reduced, and the service life of equipment can be prolonged.

Description

technical field [0001] The invention provides a frequency conversion device, and in particular relates to a constant power output intelligent frequency modulation speed regulation frequency conversion system and a control method thereof. Background technique [0002] The present invention is currently applied to submersible pumps. Because submersible pumps are submerged in water, the submerged depth of the pump and the change of water level during the working process of the pump will affect the load change of the pump. Therefore, an ordinary water pump integrated with a machine and a pump often has only one set point that meets the requirements. design standards. When the load of the pump becomes lighter, the power is wasted and the efficiency is not high; when the load is too heavy, the efficiency is also low, such as severe overload, excessive current, the temperature of the pump motor is too high and the heat is serious, which will directly affect the performance of the p...

AI Technical Summary

Problems solved by technology

When the load of the pump becomes lighter, the power is wasted and the efficiency is not high; when the load is too heavy, the efficiency is also low, such as severe overload, excessive current, the temperature of the pump motor is too high and the heat is serious, which will directly affect the performance of the pump. service life

[0003] Especially for deep well pumps, when the pump is placed in water tens of meters or even hundreds of meters deep, when the pump stops working, the groundwater level often rises to the highest point. If it is hundreds of meters, the flow rate of the pump will be very large, that is to say, the load of the motor is very heavy. After a certain period of operation of the pump, if the groundwater is not abundant, the water level will drop sharply, which means that the lift will increase, the flow rate will decrease, and the load will decrease. will be mitigated, so this dynamic is so far uncontrollable

Images