Self-inspection circuit for brushless DC motor of anesthesia machine

Abstract

The invention relates to the field of an anesthesia machine, in particular to a self-inspection circuit of a brushless DC motor of the anesthesia machine. The self-inspection circuit comprises a master control central processing unit (CPU), a field programmable gate array, a three-phase full-bridge driving circuit and a signal conditioning circuit, wherein the master control CPU is connected with the field programmable gate array; the three-phase full-bridge driving circuit is connected with the master control CPU and the field programmable gate array respectively; when the brushless DC motor is in self inspection, the master control CPU simulates driving signals of the three-phase full-bridge driving circuit in various rotation speed conditions, and the three-phase full-bridge driving circuit can work in various working frequencies by means of the capability of processing pin signals at a high speed by the field programmable gate array; the three-phase full-bridge driving circuit is directly connected with the brushless DC motor; and the field programmable gate array is connected with the brushless DC motor via the signal conditioning circuit and used for detecting a self-inspection signal of the brushless DC motor and sending a self-inspection result to the master control CPU, and therefore, the rotational speed of the brushless DC motor can be accurately regulated.

Description

technical field [0001] The invention relates to the field of anesthesia machines, in particular to a brushless DC motor self-check circuit of an anesthesia machine. Background technique [0002] Brushless DC motors (BLDC, BrushlessDCMotor) have been widely used in many fields. BLDC motors do not have a commutator, so they are more reliable than DC motors. BLDC motors are also superior to AC induction motors in many aspects. BLDC motors generate rotation through rotor magnets Magnetic fluxes have high efficiency, so they are generally used in devices with high reliability and efficiency. The use of BLDC motors does not require complex control algorithms. Its biggest feature is that the mechanical commutation structure composed of commutator and brush is replaced by electronic commutation circuit. As a result, the brushless DC motor not only has the advantages of simplicity, reliable operation, and convenient maintenance of the AC motor, but also has the advantages of high o...

AI Technical Summary

Problems solved by technology

Since most of the brushless DC motors work at high speed, the ventilation speed is about 10000r / min or more, which will gradually stimulate these potential damages and cause motor failure. However, the speed of brushless DC motors cannot be accurately adjusted in the prior art

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