Motor positioning and stopping mechanism

Abstract

The invention provides a motor positioning and stopping mechanism which comprises a brake assembly and an inertia part, the brake assembly comprises a fixed part and a movable part connected with thepower shaft, the fixed part and the movable part are provided with stop structures matched with each other, and the inertia part and the movable part are driven by the power shaft to rotate. The inertia part can rotate relative to the power shaft due to the inertia effect of the inertia part when the rotating speed of the power shaft changes. When the motor is powered off, the inertia part rotatesrelative to the power shaft due to the inertia effect of the inertia part, then the movable part is pushed or pulled, the stop structure of the movable part is made to be close to the stop structureof the fixed part, and the power shaft is prevented from rotating through the stop structures abutting against each other. The motor positioning and stopping mechanism can position and stop a power shaft for transmitting motor torque at a set position, adopts a pure mechanical structure as a whole, is free of any electrical element, simple and compact in structure, low in cost and high in universality, and is suitable for electric appliances which are small in internal space, high in rotating speed and inconvenient to control a travel switch and a servo motor.

Description

technical field [0001] The invention relates to the technical field of motor position control, in particular to a motor positioning stop mechanism. Background technique [0002] Many times we need the motor to be positioned and stopped at a certain position. For example, the electric double-headed roller toothbrush in the Chinese patent document CN110840612A requires that the two brush head bodies can be aligned together after the motor stops. If the two brush head bodies 10 are in the position after the motor stops figure 1 The position shown will make the gap between the bristle bundles in the middle of the brush head too large, and it is easy to squeeze the toothpaste into the above gap when using it next time, resulting in a decrease in user experience. [0003] Closed-loop control is a common way to achieve motor position control (including motor stop position control). The closed-loop control performs position correction according to the output feedback of the contro...

AI Technical Summary

Problems solved by technology

[0004] As we all know, the electrification of the mechanical part is a common method to reduce the volume of the traditional mechanical structure. If the electrical part of the existing servo motor PID control is changed to a purely mechanical structure, a very complicated control mechanism is required, and the volume of the control mechanism will definitely increase. , the cost is also very likely to increase. Based on the above reasons, it is rare to see a solution that relies on a purely mechanical structure to achieve motor positioning and stopping.

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