Positionless brushless direct eurrent electric machine control circuit and its intelligent control method

Abstract

The method includes techniques of creating database for operation of electrical motor, detecting position of rotor, digital filtering signal of detecting position, and intelligent control for DC motor with no brush and no position control. The invention makes DC motor with no position sensor start up smoothly and run in steady state, high efficiency and smoothly under condition of 2-3 times of load higher than nominal. Situation such as unsteady running, low efficiency, unreliable system or not operating caused by shack, high temp. Corrosion of refrigerant fluid and operation of position sensor are avoided.

Description

technical field [0001] The invention relates to a database-based non-position brushless DC motor control circuit and an intelligent control method thereof. Background technique [0002] The permanent magnet brushless DC motor has the advantages of simple structure, no commutation spark, good speed regulation performance, reliable operation, high efficiency, etc., so it is widely used in various fields of production and life today. [0003] In foreign countries, due to the low cost of electronic components, the development of permanent magnet brushless DC motors is extremely rapid, with an annual growth rate of 20%. With the development of my country's microelectronics technology, the development and application of permanent magnet brushless DC motors in my country will develop rapidly. [0004] The stator winding of the brushless DC motor is generally made of multi-phase (three-phase, four-phase, five-phase, etc.), and the rotor is composed of perm...

AI Technical Summary

Problems solved by technology

[0009] 1) The size of the motor is increased to accommodate the sensor, which increases the cost of the motor

[0010] 2) There are too many connecting wires of the sensor

These connecting wires are a disadvantage when the motor needs to be sealed to run

[0011] 3) The output signals of the sensors are all weak electrical signals, so too many and too long connecting lines are likely to introduce interference

[0012] 4) Working environments such as high temperature, low temperature, dirty air and corrosion, and working conditions such as vibration and high-speed operation will reduce the reliability of the sensor

If the sensor is damaged, it may also cause damage to other components such as the inverter

[0013] 5) The installation accuracy of the sensor directly affects the performance of the motor operation, so it also relatively increases the difficulty of the production process

[0014] 6) The existence of the sensor reduces the operating reliability of the motor and increases the difficulty of maintenance

At present, a large number of scholars at home and abroad are engaged in the research of position sensorless control technology, and have achieved many research results, but for the position sensorless control with a power above 2KW and a large dynamic range of starting load, it has always been one of the problems to be solved at home and abroad.

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