Method for generating random frequency pulse and method for controlling acceleration and deceleration of stepper motor

A stepping motor, frequency pulse technology, applied in the direction of motor generator control, control system, electrical components, etc., can solve the problem of continuous adjustable pulse difficulty

Inactive Publication Date: 2010-05-19
青岛朗讯科技通讯设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still difficulties in generating continuously adjustable pulse

Method used

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  • Method for generating random frequency pulse and method for controlling acceleration and deceleration of stepper motor
  • Method for generating random frequency pulse and method for controlling acceleration and deceleration of stepper motor
  • Method for generating random frequency pulse and method for controlling acceleration and deceleration of stepper motor

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Experimental program
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Embodiment 1

[0041] Embodiment 1, this embodiment proposes a method of using frequency synthesis method to generate arbitrary frequency pulse signal, that is, for frequencies within a certain range, a special frequency division method is used to generate multiple frequencies that do not overlap with each other, and then use A certain combination method is used to generate any frequency, so that the frequency output becomes continuously adjustable, so as to meet the different frequency requirements of the controlled object. The principle is as follows: figure 1 shown.

[0042] This embodiment uses the different counting bits of the counters in most programmable devices to output pulse signals of multiple frequency division frequencies, and then extracts one or several frequency division frequency pulses according to actual needs The signals are combined to produce a pulse signal of the desired frequency.

[0043] Since the different counting bits of the counter can only be output based on ...

Embodiment 2

[0059] Embodiment 2, the frequency-time curve of the current stepper motor follows an exponential curve growth and decline relationship during the starting and braking phases, such as image 3 Shown is the exponential growth curve in the stepping motor startup phase, and the exponential decline curve in the braking phase of the stepping motor is image 3 The inverse of the curve shown.

[0060] In order to control the stepper motor in the starting and braking phases, the input driving pulse signal can satisfy image 3 As shown in the curve relationship, it is first necessary to draw the frequency-time curve diagram of the stepper motor during the startup process according to the selected stepper motor, that is, similar to image 3 the curve shown.

[0061] The drawing of the frequency-time graph of the stepper motor when starting is based on the following principles:

[0062] The operating equation when the stepper motor drives the load is:

[0063] T ...

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Abstract

The invention discloses a method for generating random frequency pulse and a method for controlling acceleration and deceleration of a stepper motor, comprising the following steps of: firstly, counting by using a clock control counter provided from an external part ; secondly, demultiplying a clock frequency provided by the external part by using different counting bits, and outputting pulse signals with different demultiplying frequencies through each counting bit; and then extracting the pulse signals with one or several demultiplying frequencies to carry out a combination according to actual needs to generate the pulse signals of the needed frequency. The invention overcomes the defect that the traditional method only can generate pulse signals with integer frequency demultiplication value, thereby satisfying the actual requirement on precision. The invention is used for the field of stepper motor control, at the same time, the generated pulse value is combined with an actual frequency time curve graph of the stepper motor during the acceleration and the deceleration, so that the pulse value on each time point is more coincided with the actual running track and the phenomenon that the lost-step and the overshoot of the stepper motor occur at the starting and the braking phases can be avoided.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a method for generating an arbitrary frequency pulse signal and a speed-up and down-speed control method for a stepping motor designed based on the method. Background technique [0002] A stepper motor is an actuator that converts electrical pulses into angular displacement. When the stepper motor driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle (called "step angle") in the set direction. The rotation of the stepper motor runs step by step at a fixed angle, and the angular displacement can be controlled by controlling the number of pulses, so as to achieve the purpose of accurate positioning; at the same time, the speed of the motor rotation can be controlled by controlling the pulse frequency, so as to achieve adjustment. purpose of speed. The stepper motor can be used as a special motor for control, and it is widely used in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P8/14H02P8/36
Inventor 张立强
Owner 青岛朗讯科技通讯设备有限公司
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