Driving control system of direct current motor

Abstract

The utility model discloses a drive control system of a direct current motor, and relates to the field of drive control of direct current motors. The drive control system of the direct current motor comprises an alternating current input end, an AC / DC conversion module, an adjusting circuit, a discharging circuit and the direct current motor. Alternating current input by the alternating current input end is rectified into direct current through the AC / DC conversion module and then drives the direct current motor to work, and the adjusting module can periodically control the power-on time of the direct current motor. According to the utility model, an expensive MCU (Microprogrammed Control Unit) or a special chip does not need to be used, so that the design, debugging and testing of software are avoided, the development period is shortened, the research and development cost is saved, the abnormity caused by the software is avoided, and the system reliability is improved. And a complicated circuit does not need to be designed, a large number of components are saved, the production process is simple and easy to control, the production cost is reduced, and the probability that the reliability is influenced by hardware abnormity is reduced.

Description

Technical Field

[0001] The present application relates to drive control of a DC motor, and in particular to a drive control system of a DC motor. Background Art

[0002] There are usually two driving control methods for existing DC motors. One is to control the speed of the DC motor by controlling the conduction angle of the thyristor rectifier element. The other is to use PWM to control the MOSFET or triode to adjust the speed of the DC motor by the duty cycle. These two methods usually require the use of MCU or dedicated chips, and the circuits are complicated and require a large number of components. The use of MCU or dedicated chips requires complex software design, debugging and testing, resulting in high R&D costs. The use of a large number of components leads to high manufacturing costs. Complex software and a large number of components not only lead to a significant increase in costs, but also greatly reduce the reliability of the product. Utility Model Content

[0003] In order to solve the problem of high cost and low reliability of the driving system of the DC motor in the prior art, the present application provides a driving control system of the DC motor, and the specific scheme is as follows:

[0004] The drive control system of the DC motor includes: an AC input terminal, an AC / DC conversion module, an adjustment module and a DC motor; the AC power input from the AC input terminal is rectified into DC power by the AC / DC conversion module to drive the DC motor to work; the adjustment module is used to control the power-on time and speed of the DC motor.

[0005] Preferably, the adjustment module includes a regulating circuit and a discharging circuit connected in parallel; the regulating circuit is used to control the power-on time of the DC motor and to periodically discharge the discharging circuit; and the discharging circuit is used to adjust the rotation speed of the DC motor.

[0006] Preferably, the AC / DC conversion module is a rectifier bridge, which includes a first AC pin, a second AC pin, a positive pin and a negative pin, the first AC pin is connected to the live wire end of the AC input end, the positive pin is connected to the positive pole of the DC motor, the negative pin is connected to the negative pole of the DC motor, and the regulation circuit and the discharge circuit are respectively connected between the second AC pin and the neutral wire end of the AC input end.

[0007] Preferably, a switch is further included, which is connected between the first AC pin and the live wire end of the AC input end.

[0008] Preferably, the regulating circuit is a first capacitor connected between the second AC pin and the neutral terminal of the AC input terminal.

[0009] Preferably, the discharge circuit is connected between the second AC pin and the neutral terminal of the AC input terminal, and the discharge circuit includes at least one resistive load.

[0010] Preferably, the discharge circuit comprises a first resistor.

[0011] Preferably, the discharge circuit further includes a second resistor, and the first resistor and the second resistor are connected in series.

[0012] Preferably, a second capacitor is also included, which is connected between the positive pin and the negative pin of the rectifier bridge.

[0013] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0014] 1. No need to use expensive MCU or dedicated chips, thus avoiding software design, debugging and testing, which not only shortens the development cycle and saves R&D costs, but also avoids software-induced anomalies and improves system reliability;

[0015] 2. No need to design complex circuits, saving a lot of components, the production process is simple and easy to control, which not only reduces production costs, but also reduces the probability of hardware abnormalities affecting reliability;

[0016] 3. By setting the first resistor and designing its resistance value, the speed index of the motor can be basically met;

[0017] 4. By further setting the second resistor and designing its resistance value, the motor speed can be further fine-tuned conveniently and the motor speed can be controlled more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a circuit diagram of Example 1 of the utility model.

[0019] Figure 2 It is a circuit principle diagram of embodiment 1 of the utility model.

[0020] Figure 3 It is a circuit diagram of comparative example 1 of the utility model.

[0021] In the figure: 1-AC input terminal; 2-AC / DC conversion module; 21-rectifier bridge; 211-first AC pin, 212-second AC pin, 213-positive pin; 214-negative pin; 3-adjustment module; 31-regulation circuit; C1-first capacitor; 32-discharge circuit; R1-first resistor; R2-second resistor; 4-DC motor; S1-switch. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described in the present application are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0023] Comparative Example 1:

[0024] The existing DC motor drive control method usually relies on MUC, and the use of MUC requires the design of complex peripheral circuits. Common DC motor drive control circuit design solutions, such as Figure 3 As shown, it includes: MCU control circuit, metal oxide semiconductor field effect tube M1. MCU usually has built-in PWM function. By programming the MCU, PWM can be configured and the duty cycle can be adjusted. Thus, MOSFET can be controlled by PWM. Finally, the speed adjustment effect is achieved. This method obviously consumes high costs in software and hardware. At the same time, the circuit structure is relatively complex, such as Figure 3 As shown, sometimes peripheral circuits such as voltage sampling circuits, current sampling circuits and reference circuits are also needed for assistance.

[0025] Embodiment 1:

[0026] like Figure 1 and Figure 2 The drive control system of the DC motor of the utility model comprises: an AC input terminal 1, an AC / DC conversion module 2, an adjustment module 3 and a DC motor 4; the AC power inputted from the AC input terminal 1 is rectified into DC power by the AC / DC conversion module 2 to drive the DC motor 4 to work; the adjustment module 3 is used to control the power-on time and the rotation speed of the DC motor 4.

[0027] Specifically, the adjustment module 3 includes a regulating circuit 31 and a discharging circuit 32 connected in parallel; the regulating circuit 31 is used to control the power-on time of the DC motor 4 and to periodically discharge the discharging circuit 32; the discharging circuit 32 is used to adjust the speed of the DC motor 4.

[0028] Specifically, the AC / DC conversion module 2 is a rectifier bridge 21, which includes a first AC pin 211, a second AC pin 212, a positive pin 213 and a negative pin 214. The first AC pin 211 is connected to the live wire end of the AC input terminal 1, the positive pin 213 is connected to the positive pole of the DC motor 4, and the negative pin 214 is connected to the negative pole of the DC motor 4. The regulation circuit 31 and the discharge circuit 32 are respectively connected between the second AC pin 212 and the neutral wire end of the AC input terminal 1.

[0029] Optionally, a switch S1 is further included, which is connected between the first AC pin 211 and the live wire terminal of the AC input terminal 1 .

[0030] Specifically, the regulating circuit 31 is a first capacitor C1 , and the first capacitor C1 is connected between the second AC pin 212 and the neutral line terminal of the AC input terminal 1 .

[0031] Specifically, the discharge circuit 32 is connected between the second AC pin 212 and the neutral terminal of the AC input terminal 1 , and the discharge circuit 32 includes at least one resistive load.

[0032] Optionally, the discharge circuit 32 includes a first resistor R1.

[0033] Optionally, the discharge circuit 32 includes a first resistor R1 and a second resistor R2, and the first resistor R1 and the second resistor R2 are connected in series.

[0034] Optionally, a second capacitor is further included, which is connected between the positive pin 213 and the negative pin 214 of the rectifier bridge 21. The voltage directly rectified by the rectifier bridge 21 is not smooth enough, and the second capacitor can correct it.

[0035] Working principle: When the switch S1 is turned on, the rectifier bridge 21 converts AC into DC and supplies power to the DC motor 4. The power-on time of the DC motor 4 is adjusted by the first capacitor C1 according to the power of the motor. The power-on time of the DC motor 4 is equivalent to intercepting the AC power of the corresponding time period. In actual use, when the actual operating voltage of the DC motor 4 is 55v-60v, the first capacitor C1 can select a capacitor with a capacitance of 6.8 microfarads.

[0036] The first capacitor C1 discharges the first resistor R1 and the second resistor R2 periodically. Setting the second resistor R2 can facilitate fine-tuning the overall resistance of the discharge circuit 32. The discharge speed of the first capacitor C1 is inversely proportional to the speed of the DC motor 4. The resistance of the discharge circuit 32 affects the discharge time of the first capacitor C1, and thus can affect the speed of the DC motor 4. In actual use, the resistance needs to be calculated and verified according to the motor speed index.

Claims

1. A drive control system for a DC motor, characterized in that: It comprises an AC input terminal (1), an AC / DC conversion module (2), an adjustment module (3) and a DC motor (4); The alternating current inputted from the alternating current input terminal (1) is rectified into direct current by the AC / DC conversion module (2) and then drives the direct current motor (4) to operate; The adjustment module (3) is used to control the power-on time and rotation speed of the DC motor (4).

2. A drive control system for a DC motor according to claim 1, characterized in that: The adjustment module (3) comprises a regulating circuit (31) and a discharge circuit (32) connected in parallel; The regulating circuit (31) is used to control the power-on time of the DC motor (4) and to periodically discharge the discharge circuit (32); The discharge circuit (32) is used to adjust the rotation speed of the DC motor (4).

3. A drive control system for a DC motor according to claim 2, characterized in that: The AC / DC conversion module (2) is a rectifier bridge (21), the rectifier bridge (21) comprising a first AC pin (211), a second AC pin (212), a positive pin (213) and a negative pin (214), the first AC pin (211) being connected to a live wire terminal of an AC input terminal (1), the positive pin (213) being connected to a positive pole of a DC motor (4), the negative pin (214) being connected to a negative pole of the DC motor (4), and the regulating circuit (31) and the discharging circuit (32) being respectively connected between the second AC pin (212) and a neutral wire terminal of the AC input terminal (1).

4. A drive control system for a DC motor according to claim 2 or 3, characterized in that: It also includes a switch (S1) connected between the first AC pin (211) and the live wire end of the AC input end (1).

5. A drive control system for a DC motor according to claim 2 or 3, characterized in that: The regulating circuit (31) is a first capacitor (C1), and the first capacitor (C1) is connected between the second AC pin (212) and the neutral line terminal of the AC input terminal (1).

6. A drive control system for a DC motor according to claim 5, characterized in that: The discharge circuit (32) is connected between the second AC pin (212) and the neutral line terminal of the AC input terminal (1), and the discharge circuit (32) includes at least one resistive load.

7. A drive control system for a DC motor according to claim 6, characterized in that: The discharge circuit (32) comprises a first resistor (R1).

8. A drive control system for a DC motor according to claim 7, characterized in that: The discharge circuit (32) further comprises a second resistor (R2), and the first resistor (R1) and the second resistor (R2) are connected in series.

9. A drive control system for a DC motor according to claim 8, characterized in that: It also includes a second capacitor, which is connected between the positive pin (213) and the negative pin (214) of the rectifier bridge (21).

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