CN214959347U

CN214959347U - RS 485/422-based high-performance stepping motor driver

Info

Publication number: CN214959347U
Application number: CN202121302891.8U
Authority: CN
Inventors: 杨志浩; 姚腾涛; 丁利伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2021-11-30
Anticipated expiration: 2031-06-09

Abstract

The utility model relates to a high performance step motor driver based on RS 485/422. The intelligent control device comprises a control circuit board, wherein a main control MCU, a power supply unit, a driving unit, a stepping motor interface and a communication interface unit are arranged on the control circuit board, the power supply unit is electrically connected with the main control MCU, the stepping motor interface is electrically connected with the driving unit, the driving unit and the communication interface unit are both electrically connected with the main control MCU, the communication interface unit adopts an RS485 or RS422 interface, and the power supply unit comprises an input voltage, a DC-DC voltage reduction module and an LDO module. The utility model discloses a RS485 RS 422's bus form, then use standard Modbus agreement to let step motor carry out through the instruction to turn left, turn right, relative movement, absolute movement, a series of actions such as return origin, spacing, just need not reuse pulse generator through the bus, and a direct bus can drive a plurality of step motor controller.

Description

RS 485/422-based high-performance stepping motor driver

Technical Field

The utility model belongs to the technical field of step motor's technique and specifically relates to a high performance step motor driver based on RS485/422 is related to.

Background

The stepping motor is a very common electrical device in daily production and life, and along with the development of science and technology, the research on the stepping motor is deeper and deeper. At present, a common stepping motor controls the movement and stop of the stepping motor through pulse and enable, a pulse generating device is also needed in some automation fields if the driving mode is used, and when the number of the used stepping motors is large, the operability of the scheme is reduced, the overall cost is increased, and the whole system is too bulky.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a high performance step motor driver based on RS485/422, its bus form that adopts RS485/RS422, then the Modbus agreement of use standard lets step motor carry out a series of actions such as turn left, turn right, relative movement, absolute movement, return the original point, spacing through the instruction, just need not reuse pulse generator through the bus, and a direct bus can drive a lot of step motor controller.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides a high performance step motor driver based on RS485/422, includes control circuit board, last master control MCU, power supply unit, the drive unit, the step motor interface and the communication interface unit of being provided with of control circuit board, power supply unit and master control MCU electric connection, step motor interface and drive unit electric connection, drive unit and communication interface unit all with master control MCU electric connection, the communication interface unit adopts RS485 or RS422 interface.

Preferably, the power supply unit includes an input voltage, a DC-DC step-down module and an LDO module, the input voltage adopts a 24V driving voltage, the input unit is electrically connected to the DC-DC step-down module, the DC-DC step-down module is electrically connected to the LDO module, and the LDO module is in signal connection with the main control MCU.

Preferably, the driving unit comprises a driving chip and a driving circuit, the driving chip adopts a chip of TMC5160 model, the stepping motor interface comprises a connector J2, four pins of the connector J2 are respectively connected with

pins

40, 37, 48 and 45 of the driving chip, two zener diodes in series reverse are further connected at the junction of the connector J2 and the driving chip, pins BMA1 and BMA2, pins SRAH and SRAL, and pins HA2 and LA2 of the driving circuit are respectively connected with

pins

40 and 37,

pins

8 and 7, and pins 36 and 38 of the driving chip, and the driving chip is connected with the main control MCU in an SPI mode.

Preferably, the communication interface unit comprises a communication circuit and a communication interface, the communication interface adopts a connector J4,

pins

1 and 2 of the communication interface are connected with a pin RX + of the communication circuit,

pins

3 and 4 of the communication interface are connected with a pin RX-of the communication circuit,

pins

7 and 8 of the communication interface are connected with a pin TX-of the communication circuit,

pins

9 and 10 of the communication interface are connected with a pin TX + of the communication circuit, and

pins

5 and 6 of the communication interface are grounded.

Preferably, the driving unit is electrically connected with two sensors, the two sensors are respectively an origin sensor and an in-place sensor, and the origin sensor and the in-place sensor both adopt photoelectric sensors.

Preferably, two 24V output ports and two 24V sensor input ports are reserved on the main control MCU.

To sum up, the utility model discloses a beneficial technological effect does:

the communication interface unit adopts an RS485 or RS422 interface and adopts a bus mode, so that a plurality of stepping motor drivers can be mounted below an RS485/RS422 host, the connection mode is simpler, other redundant connection is not needed, and the interference of unnecessary wires is filtered. And because RS485/RS422 is based on a differential voltage form, the transmission distance is longer. In addition, the motor is convenient to use, and only the function represented by the corresponding register needs to be known, and then the industrial personal computer sends a command. And the maintainability in the later period is higher.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is an overall schematic diagram of the present invention;

FIG. 2 is a circuit schematic of a master MCU;

FIG. 3 is a circuit schematic of a communication circuit;

FIG. 4 is a circuit schematic of the communication interface;

FIG. 5 is a circuit schematic of the driver chip;

FIG. 6 is a circuit schematic of a driver circuit;

fig. 7 is a circuit schematic of a stepper motor interface.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1-7, for the utility model discloses a high performance step motor driver based on RS485/422, including control circuit board, last master control MCU, the power supply unit, drive unit, step motor interface and the communication interface unit of being provided with of control circuit board, power supply unit and master control MCU electric connection, step motor interface and drive unit electric connection, drive unit and communication interface unit all with master control MCU electric connection. The main control MCU adopts an STM32 type single chip microcomputer, a Modbus protocol is stored in the main control MCU, and a series of actions of turning left, turning right, relative movement, absolute movement, returning to the original point, limiting and the like of the stepping motor are all encapsulated in the Modbus protocol. The communication interface unit adopts an RS485 or RS422 interface and adopts a bus mode, so that a plurality of stepping motor drivers can be mounted below an RS485/RS422 host, the connection mode is simpler, other redundant connection is not needed, and the interference of unnecessary wires is filtered. And because RS485/RS422 is based on a differential voltage form, the transmission distance is longer. In addition, the motor is convenient to use, and only the function represented by the corresponding register needs to be known, and then the industrial personal computer sends a command. And the maintainability in the later period is higher.

The power supply unit comprises input voltage, a DC-DC voltage reduction module and an LDO module, the input voltage adopts 24V driving voltage, the input unit is electrically connected with the DC-DC voltage reduction module, the DC-DC voltage reduction module is electrically connected with the LDO module, and the LDO module is in signal connection with the main control MCU. The system adopts 24V driving voltage, then the voltage is converted into 5V through the DC-DC module, and then the 5V is converted into 3.3V through the LDO module to supply power for the single chip microcomputer.

The driving unit comprises a driving chip and a driving circuit, the driving chip adopts a TMC5160 model chip, and the stepping motor interface comprises a connector J2. Four pins of the connector J2 are respectively connected with the

pins

40, 37, 48 and 45 of the driving chip, two voltage stabilizing diodes which are connected in series in a reverse direction are further connected at the connection position of the connector J2 and the driving chip, and the two voltage stabilizing diodes play a role in overvoltage protection. Pins BMA1 and BMA2, pins SRAH and SRAL, and pins HA2 and LA2 of the driver circuit are connected to

pins

40 and 37,

pins

8 and 7, and pins 36 and 38 of the driver chip, respectively. The driving chip is connected with the main control MCU in an SPI mode, and the communication speed is high.

The communication interface unit comprises a communication circuit and a communication interface, wherein the communication interface adopts a connector J4,

pins

5 and 6 of the communication interface are grounded.

The driving unit is electrically connected with two sensors, the two sensors are respectively an origin sensor and an in-place sensor, and the origin sensor and the in-place sensor both adopt photoelectric sensors. The origin sensor is mainly used when the motor is initialized and reset, and the in-place sensor mainly has a limiting function and plays a role in protecting certain key positions. Two 24V output ports and two 24V sensor input ports are reserved on the main control MCU, and additional functions can be added according to previous application experience, so that the applicability is stronger.

It should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious variations or modifications which fall within the spirit of the invention are intended to be covered by the scope of the present invention.

Claims

1. The utility model provides a high performance step motor driver based on RS485/422, includes control circuit board, its characterized in that: the control circuit board is provided with a main control MCU, a power supply unit, a driving unit, a stepping motor interface and a communication interface unit, the power supply unit is electrically connected with the main control MCU, the stepping motor interface is electrically connected with the driving unit, the driving unit and the communication interface unit are both electrically connected with the main control MCU, and the communication interface unit adopts an RS485 or RS422 interface.

2. The RS 485/422-based high-performance stepper motor driver as claimed in claim 1, wherein: the power supply unit comprises input voltage, a DC-DC voltage reduction module and an LDO module, the input voltage adopts 24V driving voltage, the input unit is electrically connected with the DC-DC voltage reduction module, the DC-DC voltage reduction module is electrically connected with the LDO module, and the LDO module is in signal connection with the main control MCU.

3. The RS 485/422-based high-performance stepper motor driver as claimed in claim 2, wherein: the drive unit comprises a drive chip and a drive circuit, the drive chip adopts a chip of TMC5160 model, the interface of the stepping motor comprises a connector J2, four pins of the connector J2 are respectively connected with pins 40, 37, 48 and 45 of the drive chip, the connector J2 is also connected with two voltage stabilizing diodes which are reversely connected in series with the junction of the drive chip, pins BMA1 and BMA2 of the drive circuit, pins SRAH and SRAL, pins HA2 and LA2 are respectively connected with pins 40 and 37 of the drive chip, pins 8 and 7, pins 36 and 38 are connected, and the drive chip is connected with the main control MCU in an SPI mode.

4. The RS 485/422-based high-performance stepper motor driver as claimed in claim 3, wherein: the communication interface unit comprises a communication circuit and a communication interface, wherein the communication interface adopts a connector J4, pins 1 and 2 of the communication interface are connected with a pin RX + of the communication circuit, pins 3 and 4 of the communication interface are connected with a pin RX-of the communication circuit, pins 7 and 8 of the communication interface are connected with a pin TX-of the communication circuit, pins 9 and 10 of the communication interface are connected with a pin TX + of the communication circuit, and pins 5 and 6 of the communication interface are grounded.

5. The RS 485/422-based high-performance stepper motor driver as claimed in claim 4, wherein: the driving unit is electrically connected with two sensors, the two sensors are respectively an origin sensor and an in-place sensor, and the origin sensor and the in-place sensor both adopt photoelectric sensors.

6. The RS 485/422-based high-performance stepper motor driver as claimed in claim 5, wherein: two 24V output ports and two 24V sensor input ports are reserved on the main control MCU.