Motor driving circuit with Hall detection and encoder speed measurement functions

Abstract

The utility model discloses a motor drive circuit with Hall detection and encoder speed measurement functions, comprising an MCU chip, a motor drive chip, a CAN communication chip, a Hall sensor, an encoder, a power supply chip and an LDO power supply chip, the motor drive chip, the CAN communication chip, the Hall sensor, the encoder and the LDO power supply chip are respectively connected with the MCU chip; the power supply chip is connected with the LDO power supply chip; the motor driving chip is externally connected with a motor; and the MCU chip realizes a CAN communication function through the CAN communication chip. According to the motor drive circuit with the Hall detection and encoder speed measurement functions, a closed-loop control mode formed by control signals and feedback signals can better control the operation of a motor and master the operation state of the motor, and a modular design is adopted, so that the whole system architecture is clearer and the system performance is better under the condition that a control system is numerous and jumbled. And the later maintenance is more convenient.

Description

Technical Field

[0001] The utility model relates to a motor driving circuit with Hall detection and encoder speed measurement functions. Background Art

[0002] The common control method for brushed DC motors is to use four MOS tubes to work alternately to control the running direction of the motor. This control method has the problem of poor matching of discrete device parameter selection in application, which leads to burning of MOS tubes. At the same time, the use of discrete devices will also occupy the circuit board area, which is not very practical in occasions with high integration requirements. Moreover, in large-scale equipment, multiple components are controlled by motors. There are many components and modules. The actions of each part need to be controlled during operation. At the same time, the working status of each part must also be uploaded to the host computer. The conventional control method of using MOS tubes to control the operation of motors cannot meet the complex control requirements of large-scale equipment. Utility Model Content

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a motor drive circuit with Hall detection and encoder speed measurement functions. The closed-loop control method formed by the control signal plus the feedback signal can better control the operation of the motor and grasp the operating status of the motor. In addition, the modular design can make the entire system architecture clearer and the later maintenance more convenient when the control system is complex.

[0004] The technical solution to achieve the above purpose is: a motor drive circuit with Hall detection and encoder speed measurement functions, including an MCU chip, a motor drive chip, a CAN communication chip, a Hall sensor, an encoder, a power chip and an LDO power chip, wherein:

[0005] The motor drive chip, CAN communication chip, Hall sensor, encoder and LDO power chip are respectively connected to the MCU chip;

[0006] The power chip is connected to the LDO power chip;

[0007] The motor driving chip is externally connected to a motor;

[0008] The MCU chip realizes the CAN communication function through the CAN communication chip;

[0009] The encoder is used to detect the motor speed and feed back the detected motor speed signal to the MCU chip;

[0010] The MCU chip determines the motor operating status according to the motor speed signal fed back by the encoder, and controls the motor through the motor driver chip;

[0011] The Hall sensor is used to detect whether the motor is in place, and when the Hall sensor detects a motor in place signal, it feeds back to the MCU chip;

[0012] The MCU chip outputs a stop instruction to the motor driver chip according to the motor arrival signal received from the Hall sensor, and the motor driver chip stops the motor from running.

[0013] The above-mentioned motor drive circuit with Hall detection and encoder speed measurement functions, wherein the power chip is used to convert the DC24V voltage into a DC5V voltage to power the LDO power chip;

[0014] The LDO power chip is used to convert the DC5V voltage into a DC3.3V voltage to power the MCU chip.

[0015] The above-mentioned motor drive circuit with Hall detection and encoder speed measurement functions, wherein, during the rotation of the motor, the MCU chip reads the encoder reading once every 20MS to obtain the operation status of the motor. If the read motor speed is lower than the set stall threshold, it is determined that the motor is stalled, and the motor is stopped, and a stall error message is sent to the host computer; if the read motor speed is less than the speed threshold, the duty cycle is increased to increase the motor speed. Conversely, if the read motor speed is greater than the speed threshold, the duty cycle is reduced to reduce the motor speed, thereby ensuring the normal operation of the motor.

[0016] The motor drive circuit with Hall detection and encoder speed measurement functions of the utility model uses a closed-loop control method formed by a control signal plus a feedback signal, which can better control the operation of the motor and grasp the operating status of the motor. It also adopts a modular design, which can make the entire system architecture clearer and more convenient for later maintenance when the control system is complex. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a circuit diagram of a motor drive circuit with Hall detection and encoder speed measurement functions. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the utility model, the specific implementation method thereof is described in detail below in conjunction with the accompanying drawings:

[0019] See also Figure 1 The best embodiment of the utility model is a motor drive circuit with Hall detection and encoder speed measurement functions, including an MCU chip 11, a motor drive chip 12, a CAN communication chip 13, a Hall sensor 14, an encoder 15, a power chip 16 and an LDO power chip 17.

[0020] The motor drive chip 12 , the CAN communication chip 13 , the Hall sensor 14 , the encoder 15 and the LDO power chip 17 are respectively connected to the MCU chip 11 ; the power chip 16 is connected to the LDO power chip 17 ; the motor drive chip 12 is connected to an external motor; and the MCU chip 11 realizes the CAN communication function through the CAN communication 13 .

[0021] The encoder 15 is used to detect the motor speed and feed back the detected motor speed signal to the MCU chip 11 . The MCU chip 11 determines the motor operating status according to the motor speed signal fed back by the encoder 15 and controls the motor through the motor driver chip 12 .

[0022] The Hall sensor 14 is used to detect whether the motor is in place. When the Hall sensor 14 detects the motor in place signal, it feeds back to the MCU chip 11; the MCU chip 11 outputs a stop command to the motor driver chip 12 based on the motor in place signal received from the Hall sensor 15, and the motor driver chip 12 stops the motor operation.

[0023] The power chip 16 is used to convert the DC24V voltage into a DC5V voltage to supply power to the LDO power chip 17 ; the LDO power chip 17 is used to convert the DC5V voltage into a DC3.3V voltage to supply power to the MCU chip 11 .

[0024] In the motor drive circuit with Hall detection and encoder speed measurement functions of the utility model, during the rotation of the motor, the MCU chip 11 reads the encoder reading once every 20MS to obtain the operation status of the motor. If the read motor speed is lower than the set stall threshold, it is determined that the motor is stalled, and the motor is stopped, and a stall error message is sent to the host computer; if the read motor speed is less than the speed threshold, the duty cycle is increased to increase the motor speed. Conversely, if the read motor speed is greater than the speed threshold, the duty cycle is reduced to reduce the motor speed, thereby ensuring the normal operation of the motor.

[0025] When the motor drive circuit with Hall detection and encoder speed measurement function of the utility model is used, the MCU chip 11 communicates with the host computer or upper control board through the CAN protocol, and the host computer or upper control board can accurately obtain the status data of each motor drive circuit. In this way, the closed-loop control method formed by the control signal plus the feedback signal can better control the operation of the motor and grasp the operation result of the motor.

[0026] The motor drive circuit with Hall detection and encoder speed measurement functions of the utility model adopts a modular design. When the control system is complex, the entire system architecture can be clearer and subsequent maintenance is more convenient. This modular motor control circuit is more suitable for the use needs of the electronic control part of large equipment.

[0027] To sum up, the motor drive circuit with Hall detection and encoder speed measurement functions of the utility model, and the closed-loop control method formed by the control signal plus the feedback signal, can better control the operation of the motor and grasp the operating status of the motor, and adopts a modular design. In the case of a complex control system, the entire system architecture can be clearer and later maintenance is more convenient.

[0028] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A motor drive circuit with Hall detection and encoder speed measurement functions, characterized in that: Including MCU chip, motor driver chip, CAN communication chip, Hall sensor, encoder, power chip and LDO power chip, among which: The motor drive chip, CAN communication chip, Hall sensor, encoder and LDO power chip are respectively connected to the MCU chip; The power chip is connected to the LDO power chip; The motor driving chip is externally connected to a motor; The MCU chip realizes the CAN communication function through the CAN communication chip; The encoder is used to detect the motor speed and feed back the detected motor speed signal to the MCU chip; The MCU chip determines the motor operating status according to the motor speed signal fed back by the encoder, and controls the motor through the motor driver chip; The Hall sensor is used to detect whether the motor is in place, and when the Hall sensor detects a motor in place signal, it feeds back to the MCU chip; The MCU chip outputs a stop instruction to the motor driver chip according to the motor arrival signal received from the Hall sensor, and the motor driver chip stops the motor from running.

2. A motor drive circuit with Hall detection and encoder speed measurement functions according to claim 1, characterized in that: The power chip is used to convert the DC24V voltage into a DC5V voltage to supply power to the LDO power chip; The LDO power chip is used to convert the DC5V voltage into a DC3.3V voltage to power the MCU chip.

3. The motor drive circuit with Hall detection and encoder speed measurement functions according to claim 1, characterized in that: During the rotation of the motor, the MCU chip reads the encoder reading once every 20MS to obtain the running status of the motor. If the read motor speed is lower than the set stall threshold, it is determined that the motor is stalled, and the motor is stopped, and a stall error message is sent to the host computer. If the read motor speed is less than the speed threshold, the duty cycle is increased to increase the motor speed. Conversely, if the read motor speed is greater than the speed threshold, the duty cycle is reduced to reduce the motor speed, thereby ensuring the normal operation of the motor.

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