Motor control circuit in water pump system

Abstract

The invention relates to a motor control circuit in water pump system, comprising a motor drive motor and a motor adjusting module; the motor drive module is a sensorless driven tri-star three-phase bridge circuit; the three-phase bridge circuit is composed of three sets of single-phase drive circuits; the single-phase drive circuits are half-bridge drivers IR2103; the position of a motor rotor is judged through detecting the counter electromotive force zero crossing point in the three-phase bridge circuit; the power MOS transistor on corresponding phase circuit is switched on through determining the position of the motor rotor; the input direct current power is converted into three-phase power for driving the motor. The motor of the invention is sensorless driven; the position detection sensors on the motor are reduced; the probability of system faults is reduced; the motor is installed well; the motor is equipped with motor delay design; therefore the water pump is prevented from starting frequently; the motor is effectively prevented; the starting current of the motor is relatively low; the motor is prevented form over heat; and the service life of the motor is improved.

Description

technical field [0001] The invention belongs to the field of water pump control and relates to a motor control circuit in a water pump system. Background technique [0002] The continuous progress of solar energy application technology and photovoltaic power generation technology has brought about the development of photovoltaic water pump industry. Photovoltaic water pumps have already emerged in the irrigation industry and have won the favor of quite a few developing countries. [0003] The working principle of the photovoltaic water pump system is to use the power of photovoltaic panels to drive the DC motor or AC motor through the power conversion of the controller to drive the pump to run. It is usually used in different occasions such as farmland irrigation, livestock breeding, domestic water and fountain landscapes. . [0004] The starting of the motor in the traditional water pump system will cause the phenomenon of excessive starting current of the motor and the h...

AI Technical Summary

Problems solved by technology

[0004] The starting of the motor in the traditional water pump system will cause the phenomenon of excessive starting current of the motor and the heating of the motor, and when the motor is driven, multiple motor rotor position detection sensors are used, which makes the installation of the motor inconvenient, and once a sensor is damaged, It will cause inaccurate confirmation of the rotor position of the motor, and the AC-DC conversion accuracy of the motor is not high.

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