CN201198527Y - A DC brushless control system for sewing machine - Google Patents

Abstract

The utility model discloses a DC brushless control system for a sewing machine, which comprises a control panel, a communication circuit, an up and down needle stop sensor, a pedal sensor, an electromagnet drive, a controller, a pulse control circuit, a photoelectric isolation circuit, a power drive circuit, and an isolation protection circuit, current detection circuit, position feedback circuit, drive circuit, rectification filter circuit and switching power supply circuit. The utility model utilizes a DC brushless drive circuit and a single CPU control circuit. This drive control method reduces noise, reduces power consumption, and has good speed control. The system does not have excessive requirements on the technical level of operators. , greatly reducing the cost.

Description

A DC brushless control system for sewing machine

【Technical field】

The utility model relates to a motor control system, in particular to a DC brushless control system for a sewing machine.

【Background technique】

The drive control motors of existing industrial sewing machines generally use clutch motors. This clutch motor is an asynchronous motor that runs continuously after power-on, and relies on the clutch to drive the operation of the sewing machine head. Disadvantages such as poor control; some use dual microprocessor CPU control circuits, and the cost of this control system is relatively high.

【Content of invention】

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a DC brushless control system for sewing machines with simple operation and low cost.

The technical solution adopted by the present invention to solve its technical problems is: a DC brushless control system for sewing machines, including a control panel, a communication circuit, a needle stop sensor up and down, a pedal sensor, an electromagnet drive, a controller, a pulse control circuit, a photoelectric isolation circuit, power drive circuit, isolation protection circuit, current detection circuit, position feedback circuit, drive circuit, rectification and filtering circuit and switching power supply circuit, the control circuit, the communication circuit and the controller are connected in sequence; The controller, the pulse control circuit, the photoelectric isolation circuit, the power drive circuit, the current detection circuit, and the isolation protection circuit are connected in sequence, and the isolation protection circuit The output end of the circuit is connected to the input end of the controller; the upper and lower needle stop sensors and the pedal sensor are respectively connected to the controller; the rectification and filtering circuit is respectively connected to the power drive circuit It is connected with the switching power supply circuit; the current detection circuit, the driving circuit, the position feedback circuit and the controller in sequence; the controller is connected with the electromagnet drive.

The drive circuit is a DC brushless drive circuit.

The controller is controlled by a single microprocessor CPU.

The current feedback circuit uses a linear isolation chip.

The control panel is bidirectionally coupled to the communication circuit; the communication circuit is bidirectionally coupled to the controller.

The communication circuit and the controller are connected by RS232 interface.

The output end of the up and down needle stop sensor and the output end of the pedal sensor are respectively connected to the input end of the controller.

The output terminals of the rectification and filtering circuit are respectively connected to the input terminals of the power drive circuit and the input terminals of the switching power supply circuit.

The current detection circuit, the drive circuit, the position feedback circuit and the controller are connected in sequence, and the output end of the position feedback circuit is connected to the input end of the controller.

The input end of the controller is connected to the input end of the electromagnet drive.

The beneficial effect of the present invention is: the present invention utilizes DC brushless drive circuit, single CPU control circuit, this drive control mode reduces noise, reduces power consumption, also has good speed control, and the technical level of this system is relatively high for operators. There are no excessive requirements, which greatly reduces the cost.

【Description of drawings】

Fig. 1 is a circuit block diagram of a DC brushless control system for a sewing machine of the present invention.

【Detailed ways】

As shown in Figure 1, the utility model is a DC brushless control system for a sewing machine, including a control panel 1, a communication circuit 2, a needle stop sensor 3, a pedal sensor 4, an electromagnet drive 5, a controller 6, and a pulse control circuit 7 , Photoelectric isolation circuit 8, power drive circuit 9, isolation protection circuit 10, current detection circuit 11, position feedback circuit 12, drive circuit 13, rectification filter circuit 14 and switching power supply circuit 15.

The function of the photoelectric isolation circuit is to transmit signals with light as a medium under the condition of electrical isolation, and to isolate the input and output circuits. Therefore, it can effectively suppress system noise, eliminate ground loop interference, and have a faster response speed and longer life. The advantages of length, small size, and impact resistance make it widely used in strong-weak current interfaces, especially in the forward and backward channels of microcomputer systems.

The power drive circuit is suitable for applications such as three-phase power conversion, and has fault current protection functions and undervoltage protection functions.

The switching power supply circuit provides low-voltage power supply to circuits such as the operation panel, the main control board and the driving circuit.

The drive circuit is composed of an isolation amplifier circuit, a drive amplifier circuit and a drive circuit power supply. The three upper bridge arm drive circuits are three independent drive power supply circuits, and the three lower bridge arm drive circuits are a common drive power supply circuit.

The communication circuit is to transmit signals to each other through the communication interface when the frequency converter is controlled by a programmable (PLC) or upper computer, man-machine interface, etc., using the RS232 interface.

Switching power supply mainly has the following characteristics:

1. Small size and light weight; 2. Low power consumption and high efficiency.

Feedback circuits are widely used in various electronic circuits. Feedback is to feed back part or all of the output signal of the amplifier to the input terminal of the amplifier for comparison with the input signal, and use the effective input signal obtained from the comparison to control the output.

The function of the rectifier circuit is to convert the alternating current into direct current, and the function of the filter circuit is to process the large pulsating direct current into a smooth and small pulsating direct current.

Drive circuit: A circuit that drives the main circuit device, which is isolated from the control circuit to turn the main circuit device on and off.

Speed detection circuit: The signal of the speed detector installed on the asynchronous motor shaft machine is used as the speed signal, which is sent into the calculation circuit, and the motor can be operated at the command speed according to the command and calculation.

Protection circuit: Detect the voltage and current of the main circuit. When an abnormality such as overload or overvoltage occurs, in order to prevent the inverter and asynchronous motor from being damaged, the inverter will stop working or the voltage and current value will be suppressed.

The controller 6 adopts a single CPU processor, the drive circuit 13 is a brushless DC (BLDC) drive circuit, the control panel 1, the communication circuit 2 and the controller 6 are connected in sequence, the control panel 1 and the communication circuit 2 are bidirectionally coupled and connected, and the communication The circuit 2 and the controller 6 are bidirectionally coupled and connected.

The controller 6 , the pulse control circuit 7 , the photoelectric isolation circuit 8 , the power drive circuit 9 , the current detection circuit 11 , and the isolation protection circuit 10 are connected in sequence, and the output end of the isolation protection circuit 10 is connected to the input end of the controller 6 .

The output end of the up and down needle stop sensor 3 and the output end of the pedal sensor 4 are respectively connected to the input end of the controller 6 .

The output terminals of the rectifying and filtering circuit 14 are respectively connected to the input terminals of the power driving circuit 9 and the input terminals of the switching power supply circuit 15 .

The current detection circuit 11 , the drive circuit 13 , the position feedback circuit 12 and the controller 6 are connected in sequence; and the output end of the position feedback circuit 12 is connected to the input end of the controller 6 .

The output end of the controller 6 is connected to the input end of the electromagnet driver 5 .

The functional principle of the DC brushless control system of the sewing machine of the utility model is that the control panel 1 is bidirectionally coupled and connected with the communication circuit 2, and the communication circuit 2 inputs or receives signals fed back by the communication circuit. The communication circuit 2 is bidirectionally coupled with the controller 6 for receiving control commands and feedback signals.

The pulse control circuit 7 accepts the input signal of the controller 6, and the received signal is input to the power drive circuit 9 by the pulse control circuit 7, and the power drive circuit 9 inputs the received signal to the current detection circuit 11, and the current detection circuit 11 The received signal is input to the isolation protection circuit 10, and the signal is input to the controller by the isolation protection circuit 10.

The up and down needle stop sensor 3 is used to feed back the position of the sewing machine needle. The output ends of the up and down needle stop sensor 3 and the pedal sensor 4 are connected with the input end of the controller 6; the output end of the controller 6 is connected with the input end driven by the electromagnet. Complete various functions such as speed change, position control, and automatic sewing under the application program of the designed sewing machine.

The output end of the rectification and filtering circuit 14 is connected to the input end of the power drive circuit 9 , and the output end of the rectification and filtering circuit 14 is also connected to the input end of the switching power supply circuit.

The current detection circuit 11, the drive circuit 13, the position feedback circuit 12 and the controller 6 are connected in sequence; the drive circuit 13 is a DC brushless drive circuit; the output end of the current detection circuit 11 is connected to the output end of the drive circuit 13, and the drive circuit 13 The output terminal is connected to the input terminal of the position feedback circuit 12 , and the output terminal of the position feedback circuit 12 is connected to the input terminal of the controller 6 .

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (10)

1. Sewing machines brush DC control system, it is characterized in that: comprise control panel, telecommunication circuit, upper and lower needle stop sensor, pedal sensor, solenoid actuated, controller, pulse control circuit, photoelectric isolating circuit, power driving circuit, isolation protective circuit, current detection circuit, position feedback circuit, drive circuit, current rectifying and wave filtering circuit and switching power circuit, described control circuit, described telecommunication circuit and described controller are connected in turn; Described controller, described pulse control circuit, described photoelectric isolating circuit, described power driving circuit, described current detection circuit, described isolation protective circuit connect in turn, and the output of described isolation protective circuit is connected with the input of described controller; Described upper and lower needle stop sensor is connected described controller respectively with described pedal sensor; Described current rectifying and wave filtering circuit connects described power driving circuit and described switching power circuit respectively; Described current detection circuit, described drive circuit, described position feedback circuit are connected in turn with described controller; Described controller connects described solenoid actuated.

2. Sewing machines brush DC control system according to claim 1 is characterized in that: described drive circuit is the brush DC drive circuit.

3. Sewing machines brush DC control system according to claim 1 is characterized in that: described controller is to adopt single microprocessor CPU control.

4. Sewing machines brush DC control system according to claim 1 is characterized in that: described current feedback circuit is to utilize linear isolating chip.

5. Sewing machines brush DC control system according to claim 1 is characterized in that: described control panel is connected with described telecommunication circuit bidirectional couple; Described telecommunication circuit is connected with described controller bidirectional couple.

6. Sewing machines brush DC control system according to claim 5 is characterized in that: be to utilize the RS232 interface to connect between described telecommunication circuit and the described controller.

7. Sewing machines brush DC control system according to claim 1 is characterized in that: the output of described upper and lower needle stop sensor and the output of described pedal sensor are connected the input of described controller respectively.

8. Sewing machines brush DC control system according to claim 1 is characterized in that: the output of described current rectifying and wave filtering circuit connects the input of described power driving circuit and the input of described switching power circuit respectively.

9. Sewing machines brush DC control circuit according to claim 1, it is characterized in that: described current detection circuit, described drive circuit, described position feedback circuit are connected in turn with described controller, and the output of described position feedback circuit connects the input of described controller.

10. Sewing machines brush DC control circuit according to claim 1 is characterized in that: the input of described controller connects the input of described solenoid actuated.

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