Deep well pump control method and its driving device

Abstract

A deep well pump control method and its control device. The deep well pump control method includes the following steps: controlling the motor of the deep well pump to run at a rated speed and obtaining the torque current and output power of the motor. If the torque current of the motor is less than a predetermined speed Torque current lower limit, and the output power of the motor is less than the predetermined first power threshold, then control the motor to stop, otherwise, judge whether the output power of the motor is less than the predetermined second power threshold Pmin2, if it is greater than or equal to the second power threshold, return to the previous Step, if it is less than the second power threshold Pmin2, then execute the next step, record the outlet pressure of the deep well pump as the pressure threshold; reduce the speed of the motor, obtain the change value of the outlet pressure of the deep well pump, and judge whether the deep well pump appears according to the change value of the outlet pressure Give way. The invention can automatically realize the no-water protection of the deep-water pump, automatically identify the pressure threshold when the deep-water pump stops, and detect whether the deep-water pump leaks.

Description

technical field [0001] The invention relates to deep well pump control technology. Background technique [0002] The deep well pump motor adopts a high-speed permanent magnet motor, which can reduce the number and volume of impellers in the pump body, and reduce the cost and volume of the pump. This has become the development trend of the deep well pump industry. The drive, motor and impeller of the deep well pump are directly connected and sealed, and work in a closed deep well. Since the depth of the deep well reaches more than 100 meters, once the deep well pump breaks down and stops working normally, it is not only difficult to maintain, but also the maintenance cost is very high. This requires the deep well pump driver to have a certain degree of intelligence, not only to be able to identify a variety of faults, but also to be able to deal with them accordingly. [0003] The existing deep well pump drivers can deal with some simple faults, but there is no good solutio...

AI Technical Summary

Problems solved by technology

[0004] 1) When the silt in the deep well blocks the impeller, it will cause the motor to stall, making the pump unable to start normally;

[0005] 2) When the water level in the deep well is low, the motor and driver are exposed to the air, unable to dissipate heat through water cooling, and are easily damaged by overheating;

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