CN210839402U

CN210839402U - Be applied to step motor control circuit of cloud platform

Info

Publication number: CN210839402U
Application number: CN201922281497.XU
Authority: CN
Inventors: 孟祥振; 蔡滨; 赵莹; 赵寰
Original assignee: Shandong Sheenrun Optics Electronics Co Ltd
Current assignee: Shandong Sheenrun Optics Electronics Co Ltd
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2020-06-23
Anticipated expiration: 2029-12-18

Abstract

The utility model discloses a STEP motor control circuit applied to a holder, which comprises a single chip microcomputer, a temperature sensor connected with the input end of the single chip microcomputer and a motor drive chip connected with the output end of the single chip microcomputer, wherein the output end of the motor drive chip is connected with a STEP motor, and the single chip microcomputer is respectively connected with the sleep mode input end, the enable end, the STEP end, the DIR end, the M0 end, the M1 end, the TRQ end and the DECAY end of the motor drive chip; the output end of the stepping motor is connected to the inverting input end of a comparator in the motor driving chip, the non-inverting input end of the comparator in the motor driving chip is connected with the reference current, and the output end of the comparator is connected to the PWM controller in the motor driving chip. The utility model discloses can solve present cloud platform and lose step easily or stifled commentaries on classics and cloud platform take place to block when dead can not stop the motor, take place the motor problem of burning out at low temperature.

Description

Be applied to step motor control circuit of cloud platform

Technical Field

The utility model discloses a be applied to step motor control circuit of cloud platform belongs to the motor drive field, is one set of closed loop drive control system of motor.

Background

A stepper motor, also known as a pulse motor, is one of the actuators in a digital control system. And the stepping motor driving technology is a motor control technology based on a stepping motor. At present, the stepping motor is applied to various fields including high-precision machining, high-precision angle positioning and the like. With the continuous development of power electronic technology and automatic control technology for many years, stepping motor driving systems, particularly driving circuit parts, are developed rapidly. In a stepping motor driving system applied to a holder, the detection technology of step loss and locked rotor of a stepping motor is mainly realized by detecting the coil current of the stepping motor and adding an encoder. Although the existing stepping motor driving technology can detect that the stepping motor is out of step or locked, the burning of the stepping motor is avoided. However, in the prior art, the corresponding judgment cannot be made according to the reasons of step loss and locked rotor of the stepping motor, so that the corresponding change is made and the system can continue to work normally. Especially when working at low temperature, the existing solutions are often to increase the pan-tilt gap or directly set a large current drive. Although the two modes can solve the problem that the tripod head cannot work at low temperature, the performance of the tripod head is reduced and the power consumption of the tripod head is increased.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a be applied to step motor control circuit of cloud platform solves present cloud platform and can not stop the motor when easy step out or stifled commentaries on classics and cloud platform take place to block to die at low temperature, takes place the motor problem of burning out.

In order to solve the technical problem, the utility model discloses a technical scheme is: a stepping motor control circuit applied to a holder comprises a single chip microcomputer, a temperature sensor connected with the input end of the single chip microcomputer and a motor driving chip connected with the output end of the single chip microcomputer, wherein the output end of the motor driving chip is connected with a stepping motor, and the single chip microcomputer is respectively connected with the sleep mode input end, the enabling end, the STEP end, the DIR end, the M0 end, the M1 end, the TRQ end and the DECAY end of the motor driving chip so as to control the working state of the motor driving chip, send a motion control instruction to the motor driving chip and receive information fed back by the motor driving chip; the output end of the stepping motor is connected to the inverting input end of a comparator in the motor driving chip, the non-inverting input end of the comparator in the motor driving chip is connected with the reference current, and the output end of the comparator is connected to the PWM controller in the motor driving chip.

Further, the single chip microcomputer is also connected to a reference voltage input end of the motor driving chip through an intermediate circuit, the intermediate circuit comprises resistors R22, R23, R13 and a capacitor C22, the single chip microcomputer is connected to the reference voltage input end of the motor driving chip through serially connected resistors R22, R23 and R13, the resistor R22 and the resistor R23 are grounded, and the resistor R23 and the resistor R13 are grounded through a capacitor C22.

Furthermore, one path of the error output end of the motor driving chip is connected to the single chip microcomputer, and the other path of the error output end of the motor driving chip is connected to the light emitting diode through the resistor.

Further, the temperature sensor is 18B20, and its VCC end connects 3.3V, and GND end ground connection, DQ end are connected to the singlechip.

The utility model has the advantages that: when the stepping motor is applied to the stepping motor of the holder, the stepping motor is out of step or locked, and the greatest possibility is that the holder is blocked due to low temperature. The patent of the utility model discloses a judge only to these two kinds of circumstances. The system can make corresponding judgment according to the change of the temperature, so that the torque of the cradle head is increased at a low temperature, the motor is prevented from being locked or desynchronized, the normal torque output is kept at a normal temperature, and the excessive consumption of power is avoided. Compared with the prior art, the utility model discloses a can be better the operation of control cloud platform, avoid the unable start-up of cloud platform under motor and the low temperature of burning out when the cloud platform card is dead. This use novel can effectual solution present cloud platform lose step or locked rotor easily at low temperature, and the cloud platform takes place to block and can not stop the motor when dead, takes place the motor problem of burning out.

Drawings

FIG. 1 is a schematic block diagram of the present invention;

FIG. 2 is a schematic circuit diagram of the single chip microcomputer and peripheral circuits thereof;

FIG. 3 is a schematic circuit diagram of a motor driver chip, a temperature sensor and a stepper motor;

fig. 4 is a schematic circuit diagram of the interior of the motor driving chip.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments.

Example 1

The utility model discloses a be applied to step motor control circuit of cloud platform, as shown in fig. 1, including singlechip, the temperature sensor who links to each other with the singlechip input and the motor drive chip who links to each other with the singlechip output, step motor is connected to motor drive chip's output.

As shown in fig. 2 and 3, the single chip is connected to the sleep mode input terminal, the enable terminal, the STEP terminal, the DIR terminal, the M0 terminal, the M1 terminal, the TRQ terminal, and the DECAY terminal of the motor driving chip, respectively, so as to control the operating state of the motor driving chip, send a motion control command to the motor driving chip, and receive information received by the motor driving chip.

As shown in fig. 4, a motor driving circuit and a current feedback circuit are integrated inside the motor driving chip. The motor driving circuit comprises a control input device, a core logic device, a micro-STEP indexer, a PWM controller and an MOS tube, wherein the control input device is connected with a single chip microcomputer through a sleep mode input end, an enabling end, a STEP end, a DIR end, an M0 end, an M1 end, a TRQ end and a DECAY end respectively, the output end of the control input device is connected to the PWM controller through the core logic device and the micro-STEP indexer, the output end (GateDrive) of the PWM controller is connected to the grid electrode of the MOS tube, the source electrode of the MOS tube is connected with a VM, and the drain electrode of the MOS tube is connected to a stepping motor. The control input device, the core logic device, the micro-step indexer and the PWM controller in the motor driving chip are the prior art, and the specific structure and the implementation process thereof are not described in detail in this embodiment.

As shown in fig. 4, the current feedback circuit includes a comparator disposed inside the motor driving chip, the working current of the stepping motor is connected to the inverting input terminal of the comparator inside the motor driving chip through the output terminal of the motor driving chip, the non-inverting input terminal of the comparator inside the motor driving chip is connected to the reference current, and the output terminal is connected to the PWM controller inside the motor driving chip.

As shown in fig. 2 and 3, the single chip microcomputer is further connected to a reference voltage input end of the motor driving chip through an intermediate circuit, the intermediate circuit includes resistors R22, R23, R13 and a capacitor C22, the single chip microcomputer is connected to the reference voltage input end of the motor driving chip through resistors R22, R23 and R13 which are connected in series, the resistor R22 and the resistor R23 are grounded, and the resistor R23 and the resistor R13 are grounded through a capacitor C22.

In order to display the working state of the motor driving chip, one path of the error output end of the motor driving chip is connected to the single chip microcomputer, and the other path of the error output end of the motor driving chip is connected to the light emitting diode D4 through the resistor R14.

In this embodiment, the temperature sensor is 18B20, and its VCC end connects 3.3V, and GND end ground connection, DQ end are connected to the singlechip.

When the temperature sensor works, the single chip microcomputer receives a temperature detection signal fed back by the temperature sensor, receives feedback information of the motor driving chip through the SPI interface or gives an instruction to the motor driving chip, and sends a motion control instruction to the motor driving chip through the STEP and DIR interfaces of the motor driving chip. Thereby motor driver chip controls step motor's operation through control motor drive circuit to whether detect the motor through current sampling circuit and lose step or locked rotor, then feed back to STM32 singlechip through the SPI interface. When the motor is out of step or locked, the STM32 single chip microcomputer firstly judges whether to work at low temperature. If the cradle head works at a low temperature, the STM32 single chip microcomputer controls the motor driving chip to increase the rotating torque of the motor until the rotating torque is increased to a set maximum torque, and if the cradle head cannot normally run, the cradle head stops working. When the motor is out of step or locked, if the cradle head is detected to work at normal temperature, the cradle head directly stops working to prevent the motor from being burnt.

When the cradle head using the motor driving system works, firstly, the STM32 single chip microcomputer drives the motor to work with the minimum driving moment at normal temperature through the motor driving chip so as to minimize the working current, and therefore, the cradle head is more energy-saving. When the holder works at a low temperature, because the torque required by the holder in working is greatly increased due to the low-temperature state, the output torque at the normal temperature can not meet the working requirement of the holder, and the motor can generate the phenomena of step loss and rotation blockage. At this moment, the motor driving chip can detect the abnormal state of the motor through the current detection circuit and feed back state information through communication between the SPI interface and the STM32 single chip microcomputer. The STM32 single chip microcomputer firstly judges whether to work at low temperature after receiving the abnormal state of the motor, if so, the torque is increased, otherwise, the motor stops working.

What has been described above is only the basic principle and the preferred embodiments of the present invention, and what those skilled in the art made according to the present invention changes the machine and replaces, and belongs to the protection scope of the present invention.

Claims

1. The utility model provides a be applied to step motor control circuit of cloud platform which characterized in that: the single chip microcomputer is respectively connected to a sleep mode input end, an enabling end, a STEP end, a DIR end, an M0 end, an M1 end, a TRQ end and a DECAY end of the motor driving chip, so that the working state of the motor driving chip is controlled, a motion control instruction is sent to the motor driving chip, and information fed back by the motor driving chip is received; the output end of the stepping motor is connected to the inverting input end of a comparator in the motor driving chip, the non-inverting input end of the comparator in the motor driving chip is connected with the reference current, and the output end of the comparator is connected to the PWM controller in the motor driving chip.

2. The stepping motor control circuit according to claim 1, wherein: the single chip microcomputer is further connected to a reference voltage input end of the motor driving chip through an intermediate circuit, the intermediate circuit comprises resistors R22, R23, R13 and a capacitor C22, the single chip microcomputer is connected to the reference voltage input end of the motor driving chip through resistors R22, R23 and R13 which are connected in series, the resistor R22 and the resistor R23 are grounded, and the resistor R23 and the resistor R13 are grounded through a capacitor C22.

3. The stepping motor control circuit according to claim 1, wherein: one path of an error output end of the motor driving chip is connected to the single chip microcomputer, and the other path of the error output end of the motor driving chip is connected to the light emitting diode through the resistor.

4. The stepping motor control circuit according to claim 1, wherein: the temperature sensor is 18B20, and its VCC end connects 3.3V, and GND end ground connection, DQ end are connected to the singlechip.