A multi-processor permanent magnet brushless direct current motor combined speed regulation system

Abstract

A multi-processor permanent magnet brushless direct current motor combined speed regulation system of the invention comprises a brushless direct current motor, a main processor module, an auxiliary processor module, a level conversion module, a main counter potential detection module, an auxiliary counter potential detection module and a drive circuit module. The main processor module and the auxiliary processor module interact with each other and are both used to collect the rotor position of the brushless direct current motor and separately output digital PWM signals for controlling the rotational speed of the brushless direct current motor through the detected rotor rotation position. Digital PWM output terminals of the main processor module and the auxiliary processor module are separately connected to a level conversion module converting 3.3V level signals into 12V level signals. The level conversion module is connected to a drive circuit module driving the brushless direct current motor. The brushless direct current motor feed motor rotor position signals back to a main processor module interruption input port and an auxiliary processor module analog quantity acquisition port through the main counter potential detection module and the auxiliary counter potential detection module.

Description

technical field [0001] The invention relates to the technical field of brushless DC motor speed regulation, in particular to a multi-processor permanent magnet brushless DC motor combined speed regulation system. Background technique [0002] With the rapid development of power electronics technology and devices, brushless motor BLDC gradually replaces traditional brushed motors with its advantages of no carbon brush wear, no commutation sparks, low noise, low maintenance costs, high operating efficiency and long service life. And it is widely used in emerging technology fields such as home appliances, model airplanes, and electric vehicles. The brushless motor must judge the rotation position of the rotor when adjusting the speed. The controller uses the rotation position fed back by the rotor to commutate according to the set control strategy, so that the motor can rotate continuously and reliably in each operation cycle. In the field of position sensor detection brushles...

AI Technical Summary

Problems solved by technology

[0003] The existing brushless DC motor speed control system has the following defects and deficiencies: (1) The position sensor is used to detect the rotational position of the rotor, which further increases the size and cost of the brushless DC motor, and at the same time, the signal transmission cable of the position sensor is easily disturbed by the external environment , to reduce the continuity of motor operation; (2) The non-position rotor position signal detection method is single, only using the back EMF pulse method or the stator terminal voltage analog acquisition method, and does not combine the two methods of digital and analog to determine the rotor rotation position ; (3) Only one processor is used for drive control without combining the advantages of multi-processing joint operation. If the control board processor fails, the motor cannot run continuously and stably; (4) The motor drive control bridge adopts a single bridge operation mode, When a power electronic device on any bridge wall fails, the brushless DC motor needs to be shut down immediately for maintenance

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