Sensorless direct-current brushless motor controller and control method thereof

Abstract

The invention discloses a sensorless direct-current brushless motor controller and a control method thereof. The controller is composed of a power supply circuit, an MCU inverter control drive circuit and a sensorless detection circuit. The power supply circuit provides power for the MCU inverter control drive circuit and drives the direct-current brushless motor to work by the MCU inverter control drive circuit. The sensorless detection circuit detects a working voltage and an operating current of the direct-current brushless motor and sends detection results to the MCU inverter control drive circuit; the MCU inverter control drive circuit determines a counter electromotive force zero-crossing point based on combination of a position detection mid-point method with an ADC sampling method and the 30-degree electrical angle of a rotor is delayed to determine a commutation time of the motor, so that the direct-current brushless motor is driven to accelerate slowly until a predetermined rotation speed is reached. According to the controller disclosed by the invention, the commutation time of the motor is determined and the direct-current brushless motor is controlled to work at the predetermined rotation speed. The sensor part is reduced; the cost is lowered; and the reliability is enhanced.

Description

technical field [0001] The invention relates to a position sensor-based DC brushless motor controller and a control method thereof. Background technique [0002] At present, with the expansion of the scale of aquaculture in my country, aquaculture is developing in the direction of energy saving, emission reduction, cost saving, and intelligent control. At present, large-scale aquaculture in my country adopts a single manual control method for mechanical oxygenation, which not only takes up a lot of human resources, but also generally has a huge waste of electric energy, and the efficiency of the oxygenation machine is low. At the same time, it brings huge losses to the operators. security risks. The impeller aerator is the most widely used aeration equipment in fish farming. Most of the existing traditional impeller-type aerators use AC asynchronous motors to drive the impeller to rotate through the gear deceleration to achieve the effect of oxygenation. There are three typ...

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Problems solved by technology

[0003] 1. Due to fierce market competition, some manufacturers use poor materials to reduce costs, and the service life of the whole machine is short; the output power efficiency is low, and the general efficiency is about 60-70%. Some motor materials are poorly used and the efficiency is lower

[0004] 2. The motor increases the output torque through gear deceleration, and the gearbox needs to be maintained regularly, and the maintenance cost is high

[0005] 3. Too many mechanical structures are used, the weight of the whole machine is heavy, 40-50 kg, and the driving structure is complicated, and the operation noise is large

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