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Limit sensing method

A sensing method and zero-point position technology, applied in the field of limit sensing, can solve the problems of normal operation interference of the workbench, occupying the space of the workbench, etc., and achieve the effect of saving use and optimizing the space structure

Inactive Publication Date: 2017-07-21
BEIJING TIERTIME TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method requires additional sensor devices such as trigger switches to be installed in the equipment, which occupy space on the workbench and cause interference to the normal operation of the workbench.

Method used

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  • Limit sensing method

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Embodiment

[0031] Taking the existing 3D printer equipment as an example, the motor is a stepping motor. A stepper motor is an actuator that converts electrical pulses into angular displacement.

[0032] The stepper motor adopts pulse width modulation subdivision drive circuit, which adds the control voltage output by DPA to the input end of the pulse width modulation circuit, and the pulse width modulation circuit converts the input control voltage into a rectangular wave with corresponding pulse width. The control of the on-off time of the power amplifier tube changes the average current output to the motor winding. Taking the rotation time of one step angle as the period T, within the detection period T, the duty cycle of the output level, the duty cycle of the output voltage in the normal working state is not more than 95%, and the duty cycle in the locked-rotor state is less than 95%. Greater than or equal to 99%.

[0033] In order to achieve the purpose of detection within one cy...

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Abstract

The invention discloses a limit sensing method. The limit sensing method comprises steps that a first contact block and a second contact block are respectively arranged on a fixed equipment zero point portion and a mobile device; a motor used for driving the mobile device to operate is operated, and a real-time characteristic parameter of the motor is acquired; according to the real-time characteristic parameter of the motor, a locked-rotor detection method based on a characteristic parameter threshold is employed to carry out locked-rotor detection on the motor in real time; whether the real-time characteristic parameter is larger than the preset characteristic parameter threshold is monitored; whether arrival at the zero point portion is realized is determined. Compared with the prior art, the method is advantaged in that self controllable locked-rotor characteristic state of the motor is utilized, trigger type components can be saved, designing a contact type block is only required, and an industrial design space structure is optimized. The locked-rotor characteristic parameter of the motor is employed, program determination for the characteristic parameter is carried out through a control system, and zero point determination on the industrial control equipment is accomplished.

Description

technical field [0001] The invention relates to the technical field of industrial control, in particular to a limit sensing method. Background technique [0002] In the existing industrial control field, the characteristic electrical signal provided by trigger components such as travel switches (limit switches), Hall switches, and encoders is used to confirm the zero point design, and then the zero point is used for industrial control design. This method needs to additionally install sensing devices such as trigger type travel switches in the equipment, and the devices occupy the space of the workbench and also cause interference to the normal operation of the workbench. [0003] Motor stall means that the motor still outputs torque when the speed is 0 revolutions. Generally, the motor works normally, and each data has a rated value. When the motor is locked, the characteristic parameters of the locked rotor will be generated, which have a certain proportional relationship ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 郭戈唐果林付腾飞高明希
Owner BEIJING TIERTIME TECH
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