A multiprocessor permanent magnet brushless DC motor joint speed regulation system and method

Abstract

The invention relates to a multiprocessor permanent-magnet brushless DC motor combined speed regulation system and method. The speed regulation of a brushless DC motor is controlled by a system which comprises a main operation module and an auxiliary operation module, wherein the main operation module and the auxiliary operation module can interact with each other, and are connected in parallel. The method enables a rotor of the brushless DC motor to achieve the no-position detection without an additional rotor detection module through a counter electromotive force method for main counter electromotive force detection and a stator end voltage analog collection method for auxiliary counter electromotive force detection, and further reduces the speed regulation cost and size of the brushless motor. Moreover, the above two methods cooperate for the detection of the position of a motor rotor, thereby guaranteeing the normal phase change of the brushless motor, and improving the precision of a processor decision making basis and the position detection of the rotor. When any one detection unit has a fault, the operation of the brushless motor is not affected. Meanwhile, the processors in the main operation module and the auxiliary operation nodule complement the rotor position detection. The system and method are high in detection precision of the position of the rotor, are good in control and speed regulation stability, and is flexible in operation mode.

Description

technical field [0001] The invention relates to the technical field of brushless DC motor speed regulation, in particular to a multiprocessor permanent magnet brushless DC motor combined speed regulation system and method. 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 detectio...

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Problems solved by technology

[0003] The existing brushless DC motor speed control system and method have the following defects and deficiencies: (1) The position sensor is used to detect the rotational position of the rotor, which further increases the volume and cost of the brushless DC motor, and the signal transmission cable of the position sensor is easily affected by the external environment. (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 digital and analog methods to judge 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 uses a single bridge operation In this way, when the power electronic device on any bridge wall fails, the brushless DC motor needs to be shut down immediately for maintenance

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