Device for controlling stepping motor

Abstract

The invention is applicable in the video monitoring field, and provides a device for controlling a stepping motor. The device comprises a single chip machine, a combination circuit, a driving circuit, a stepping motor and an execution mechanism. The single chip machine is used for generating four paths of PWM (Pulse-Width Modulation) waves for controlling subdivision works of the motor. The combination circuit is connected with the output end of the single chip machine and used for outputting the four paths of PWM waves output by the single chip machine according to the time sequence requirement of the subdivision works of the motor. The driving circuit is connected with the output end of the combination circuit and used for receiving the four paths of PWM waves according to the time sequence requirement of the subdivision works of the motor. The stepping motor is connected with the output end of the driving circuit. The execution mechanism is used for converting electric pulse into angular displacement so as to drive a load to work. By using the single chip machine, the combination circuit, the driving circuit and the like, the subdivision can be carried out through the single chip machine only having four paths of PWM channels so as to control two two-phase stepping motors; and therefore, a function of freely setting the subdivision number of the stepping motor through software can be realized.

Description

technical field [0001] The invention belongs to the field of video monitoring, in particular to a device for controlling a stepping motor. Background technique [0002] At present, in the field of video surveillance, most of the front-end equipment has two built-in motors, one is used to control the rotation in the horizontal direction, which can capture scene changes within 360 degrees; the other is to control the rotation in the vertical direction, which can capture 0~ Scene change within -90 degree angle range. Usually, this type of equipment is divided into non-adjustable speed devices using AC synchronous motors and adjustable speed devices using stepping motors. Both devices require good motion characteristics and clear and stable images. [0003] In the adjustable speed device controlled by the stepping motor, it is divided into two modes: full-step driving motor and subdivision driving motor. Usually, in the process of driving the motor in a full step, the step ang...

AI Technical Summary

Problems solved by technology

And often some single-chip microcomputers cannot have 8 PWM channels at the same time, so they cannot realize the requirement of controlling two stepper motors at the same time to achieve subdivision or can only meet the requirements of controlling one stepper motor

At the same time, some of them are subdivided by hardware, but the cost is high, and the number of subdivisions is limited by the hardware circuit, so the control is not flexible

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