Motor system capable of regulating speed and rotating forwards and backwards

Abstract

The utility model belongs to the field of motors, and particularly relates to a speed-adjustable and positive and negative rotation motor system, which comprises a PWM (Pulse Width Modulation) motor, a power supply, a first intermediate relay, a second intermediate relay and a PLC (Programmable Logic Controller), the first intermediate relay is provided with a double-contact normally-open switch and a first coil for controlling the double-contact normally-open switch, two contacts at one end of the double-contact normally-open switch are connected with the positive electrode and the negative electrode of the power supply respectively, and two contacts at the other end of the double-contact normally-open switch are connected with the positive electrode and the negative electrode of the PWM motor respectively; the second intermediate relay is provided with a three-contact normally-open switch and a second coil for controlling the three-contact normally-open switch, one contact at one end of the three-contact normally-open switch is connected with the positive electrode of the power supply, and a contact at the other end opposite to the contact is connected with the positive electrode of the PWM motor; the PLC is connected with the first coil and the second coil. When the PWM motor regulates the speed or regulates the positive and negative rotation, the signal output by the PLC firstly controls the coil of the intermediate relay, and then the power supply of the PWM motor is switched by the contact, so that the IO interface is prevented from being damaged by the start-stop surge of the motor.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the motor field, concretely relates to a kind of motor system of speed regulation and positive and negative rotation. BACKGROUND

[0002] PWM motor is the motor system of speed, torque precision control by pulse width modulation (PWM) technology.Its core is to control motor output by adjusting the duty cycle (high level time / period) of electrical signal, analog equivalent voltage.

[0003] PWM motor usually includes motor and PWM drive module, motor is accessed PWM drive module, PWM drive module is equipped with power terminal, positive and negative rotation terminal and speed regulation knob, power terminal is accessed power supply, and PWM drive module can start motor, the positive and negative rotation of motor can be adjusted by giving positive and negative rotation terminal signal, and the speed of motor can be adjusted by speed regulation knob.

[0004] If PWM motor is directly connected with PLC, then when PWM motor starts or adjusts positive and negative rotation, motor start-stop surge is easy to damage the IO interface of PLC. INVENTION CONTENTS

[0005] The motor system of speed regulation and positive and negative rotation provided by the utility model can effectively solve the problems in the background art.

[0006] The motor system of speed regulation and positive and negative rotation provided by the utility model, including PWM motor, power supply, first intermediate relay, second intermediate relay and PLC;

[0007] First intermediate relay is equipped with double-contact normally open switch and the first coil for controlling double-contact normally open switch, and the two contacts of one end of double-contact normally open switch are connected with the positive and negative poles of power supply respectively, and the two contacts of the other end of double-contact normally open switch are connected with the positive and negative poles of PWM motor respectively;

[0008] Second intermediate relay is equipped with three-contact normally open switch and the second coil for controlling three-contact normally open switch, and one of the contacts of one end of three-contact normally open switch is connected with the positive pole of power supply, and the other end contact opposite to the contact is connected with the positive pole of PWM motor;The other two contacts of one end of three-contact normally open switch are connected with the negative pole of power supply respectively, and the other two contacts of the other end opposite to the two contacts are connected with the negative pole of motor and the positive and negative rotation control end of PWM motor respectively;

[0009] Power supply supplies power to PLC;PLC is connected with the first coil and the second coil.

[0010] As further optimization of the utility model, fuse is further provided on the loop where first intermediate relay, second intermediate relay and PWM motor are connected.

[0011] As further optimization of the utility model, still include touch screen computer, touch screen computer connects PLC.

[0012] As further optimization of the utility model, still include touch screen computer, touch screen computer connects PLC.

[0013] As further optimization of the utility model, PLC adopts singlechip instead.

[0014] The utility model provides a kind of motor system of speed regulation and positive and negative rotation, PWM motor speed regulation or adjust positive and negative rotation, the signal of PLC output is controlled first middle relay coil, then PWM motor power supply is switched by contact, avoid motor start-stop surge damage IO interface. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the wiring principle diagram of this embodiment;

[0016] Figure 2 It is the PLC wiring principle diagram of this embodiment;

[0017] Among them, PWM motor 1, double-contact normally open switch 2, first coil 3, three-contact normally open switch 4, second coil 5, PLC 6, fuse 7, speed regulation knob 8. CONCRETE EMBODIMENT

[0018] Utilize PWM drive module to drive direct current motor, can realize the positive and negative rotation and speed regulation of motor, PWM drive module is low in price, very common.

[0019] This embodiment is just based on the improvement of PWM drive module, the output end of common PWM drive module is connected motor, the power supply end of PWM drive module is connected the positive and negative pole of power supply, the control end of PWM drive module is realized to the positive and negative rotation control of motor by power-on and power-off, PWM drive module is usually also equipped with speed regulation knob 8, realizes the function of adjusting speed by speed regulation knob 8.

[0020] This embodiment includes PWM motor 1, power supply, first intermediate relay, second intermediate relay and PLC 6.

[0021] PWM motor 1 is just by PWM drive module and motor.

[0022] As Figure 1 As shown in the figure, first intermediate relay is equipped with double-contact normally open switch 2, the two contacts of double-contact normally open switch 2 one end are connected the positive and negative pole of power supply respectively, the two contacts of double-contact normally open switch 2 other end are connected the positive and negative pole of PWM motor 1 power supply end respectively, i.e. power supply is powered to PWM motor 1 after first intermediate relay.

[0023] The second intermediate relay is provided with a three-contact normally open switch 4, one end of one of the contacts of the three-contact normally open switch 4 is connected to the positive pole of the power supply, and the opposite end of the contact is connected to the positive pole of the PWM motor. The other two contacts of the three-contact normally open switch 4 are connected to the negative pole of the power supply, and the opposite ends of the two contacts are respectively connected to the negative pole of the PWM motor 1 and the control end of the PWM motor 1.

[0024] The first intermediate relay is further provided with a first coil 3, and the on-off of the first coil 3 controls the opening and closing of the double-contact normally open switch 2 of the first intermediate relay. The first coil 3 is connected to the PLC 6, and the PLC 6 controls the power-on and power-off of the first coil 3.

[0025] The second intermediate relay is further provided with a second coil 5, and the on-off of the second coil 5 controls the opening and closing of the three-contact normally open switch 4 of the second intermediate relay. The second coil 5 is also connected to the PLC 6, and the PLC 6 controls the power-on and power-off of the second coil 5.

[0026] Specifically, the two common terminals of the PLC 6 are connected to the positive pole of the power supply, one end of the first coil 3 is connected to one point of the PLC 6 output, one end of the second coil 5 is connected to another point of the PLC 6 output, and the other end of the first coil 3 and the second coil 5 is connected to the negative pole of the power supply.

[0027] In other embodiments, the PLC 6 can also be replaced by a single-chip microcomputer.

[0028] In this embodiment, the PLC 6 controls the power-on and power-off of the first coil 3 and the second coil 5, thereby controlling the opening and closing of the double-contact normally open switch 2 of the first intermediate relay and the three-contact normally open switch 4 of the second intermediate relay to realize the switching of the opening and closing. When the first intermediate relay is connected, the PWM motor 1 rotates, and when the first intermediate relay is switched to the second intermediate relay, the PWM motor 1 reverses.

[0029] Preferably, a fuse 7 is further arranged in the circuit of the first intermediate relay, the second intermediate relay and the PWM motor 1, and the fuse 7 is used for protecting the motor.

[0030] Preferably, a touch screen computer is further included, and the touch screen computer is connected to the PLC 6, so that the PLC 6 can be controlled through the touch screen computer, and the PWM motor 1 can be controlled through the PLC 6.

[0031] Preferably, a speed sensor, a position sensor and a load sensor are further arranged near the rotating shaft of the PWM motor 1, and are respectively used for detecting the rotating speed, the rotating angle and the load of the PWM motor 1. The speed sensor, the position sensor and the load sensor are all connected to the touch screen computer, and the detected speed, rotating angle and load are displayed on the touch screen computer.

[0032] It should be explained finally that the above embodiment is only used to illustrate the technical scheme of the utility model, and is not the limit of the protection scope of the utility model, although the utility model is explained in detail with reference to the preferred embodiment, the ordinary skilled in the art should understand that the technical scheme of the utility model can be modified or replaced equivalently, and does not deviate from the essence and scope of the technical scheme of the utility model.

Claims

1. A speed-adjustable and reversible motor system, characterized in that, The PWM motor, the power supply, the first intermediate relay, the second intermediate relay and the PLC are included. The first intermediate relay is provided with a double-contact normally open switch and a first coil for controlling the double-contact normally open switch. Two contacts at one end of the double-contact normally open switch are connected to the positive and negative poles of the power supply respectively. Two contacts at the other end of the double-contact normally open switch are connected to the positive and negative poles of the PWM motor respectively. The second intermediate relay is provided with a three-contact normally open switch and a second coil for controlling the three-contact normally open switch. One contact at one end of the three-contact normally open switch is connected to the positive pole of the power supply. The other contact at the other end of the three-contact normally open switch is connected to the positive pole of the PWM motor. The other two contacts at one end of the three-contact normally open switch are connected to the negative pole of the power supply. The other two contacts at the other end of the three-contact normally open switch are connected to the negative pole of the motor and the positive and negative reversal control end of the PWM motor respectively. The power supply supplies power to the PLC. The PLC is connected to the first coil and the second coil.

2. The adjustable speed and reversible motor system of claim 1, wherein, A fuse is further arranged on the circuit in which the first intermediate relay, the second intermediate relay and the PWM motor are connected.

3. The adjustable speed and reversible motor system of claim 1, wherein, A touch screen computer is further included. The touch screen computer is connected to the PLC.

4. The adjustable speed and reversible motor system of claim 3, wherein, A speed sensor, a position sensor and a load sensor are further arranged near the rotating shaft of the PWM motor. The speed sensor, the position sensor and the load sensor are all connected to the touch screen computer.

5. The adjustable speed and reversible motor system of claim 1, wherein, The PLC is replaced by a single-chip microcomputer.

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