Permanent magnet brushless motor for speed regulation by magnetic flux

Abstract

The invention provides a permanent magnet brushless motor for speed regulation by magnetic flux, which includes a casing, a stator component disposed inside the casing, a rotor component disposed inside the casing and extending out of the casing, and an adjusting component disposed outside the casing and extending into the casing. The stator component and the rotor component are arranged coaxiallyand the stator component is disposed outside the rotor component. The distance between the stator component and the rotor component can be adjusted movably. The rotor component is arranged to be in acontracted state, an expanded state, or a transition state between the contracted state and the expanded state, the three states being switchable, and the initial state of the rotor component is thetransition state. The rotor component in the contracted state and the stator component have the largest distance therebetween, and the rotor component in the expanded state and the stator component have the shortest distance therebetween. The adjusting component is configured to drive the rotor component to switch between the contracted state and the expanded state. The casing is also provided therein with an electronic commutator and a rotor position sensor.

Description

technical field [0001] The invention relates to a brushless permanent magnet motor, in particular to a permanent magnet brushless motor whose speed is adjusted by magnetic flux. Background technique [0002] The permanent magnet brushless motor can be regarded as a DC motor that replaces the mechanical commutation with an electronic commutation device. The permanent magnet DC brushless motor is mainly composed of a permanent magnet motor body, a rotor position sensor and an electronic commutation circuit. Brush motors have many similarities with traditional permanent magnet brushed motors, replacing the stator poles of a brushed DC motor with a rotor equipped with permanent magnets, replacing the armature with a stator with multi-phase windings, and using a solid-state inverter. The electronic commutator composed of a shaft position detector replaces the mechanical commutator and brushes. Compared with the traditional permanent magnet brushed motor, the permanent magnet brus...

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Problems solved by technology

[0002] The permanent magnet brushless motor can be regarded as a DC motor that replaces the mechanical commutation with an electronic commutation device. The permanent magnet DC brushless motor is mainly composed of a permanent magnet motor body, a rotor position sensor and an electronic commutation circuit. Brush motors have many similarities with traditional permanent magnet brushed motors, replacing the stator poles of a brushed DC motor with a rotor equipped with permanent magnets, replacing the armature with a stator with multi-phase windings, and using a solid-state inverter. The electronic commutator composed of a shaft position detector replaces the mechanical commutator and brushes. Compared with the traditional permanent magnet brushed motor, the permanent magnet brushless motor has the advantages of simple structure, reliable operation, small size, low mass and low loss. Less, high efficiency, and the shape and size of the motor can be flexible and diverse, because the application range is extremely wide. At present, the speed regulation of the permanent magnet brushless motor is mainly carried out by changing the loaded voltage, which increases the circuit part. The structure is complicated, the production cost is high, the maintenance is difficult, and the long-term use of line aging is prone to electricity safety problems. Therefore, it is necessary for the present invention to provide a smart structure, simple principle, low production cost, convenient maintenance and constant voltage loading. Permanent magnet brushless motor driven and controlled by magnetic flux

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