CN210669933U

CN210669933U - Direct current motor drive circuit

Info

Publication number: CN210669933U
Application number: CN201921512037.7U
Authority: CN
Inventors: 宋银新
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2020-06-02
Anticipated expiration: 2029-09-11

Abstract

The utility model provides a DC motor drive circuit, main electronic component have 1 motor, 1 potentiometre, 2 diodes, 2 relays, 2 reset switch, 2 limit switch, 1 rocker switch, 1 pair rocker switch. The beneficial effects of the utility model are that there are four kinds of drive modes: automatic continuous forward rotation, automatic continuous reverse rotation, manual forward rotation and manual reverse rotation; there are three protection modes: after the set stroke is reached, the motor automatically stops running, and short circuit and emergency power-off shutdown caused by simultaneous starting of forward rotation and reverse rotation are prevented.

Description

Direct current motor drive circuit

Technical Field

The utility model relates to a DC motor drive circuit, mainly used drive DC motor work.

Background

The front section time is designed into linear cutting equipment for reducing the fault rate and the injury rate of the mobile phone in the screen splitting process, the structure and the driving circuit of the linear cutting equipment are relatively simple, and the equipment needs to be pushed by hands to work.

Disclosure of Invention

To free both hands and enable the device to operate automatically, a motor and its corresponding drive circuitry are required. The utility model provides a DC motor drive circuit, main electronic component have 1 motor, 1 potentiometre, 2 diodes, 2 relays, 2 reset switch, 2 limit switch, 1 rocker switch, 1 pair rocker switch.

The beneficial effects of the utility model are that there are four kinds of drive modes: automatic continuous forward rotation, automatic continuous reverse rotation, manual forward rotation and manual reverse rotation; there are three protection modes: after the set stroke is reached, the motor automatically stops running, and short circuit and emergency power-off shutdown caused by simultaneous starting of forward rotation and reverse rotation are prevented.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a complete circuit diagram of the present invention in the power-off state.

Fig. 2 is a schematic diagram of the circuit state of the automatic forward rotation device of the present invention.

Fig. 3 is a schematic diagram of the circuit state of the manual forward rotation device of the present invention.

Fig. 4 is a schematic diagram of the circuit state during the automatic reverse operation of the present invention.

Fig. 5 is a schematic diagram of the circuit state during the manual reverse operation of the present invention.

In the figure, M is a motor, RP. is a potentiometer, VD1 is a first diode, VD2 is a second diode, SQ1 is a forward limit switch, SQ2 is a reverse limit switch, K1. is a forward relay, K2. is a reverse relay, SR1 is a forward switch, SR2 is a reverse switch, SH. is a selector switch, and SBE is a main switch.

Detailed Description

The potentiometer (RP) is required to be arranged on a common forward rotation circuit and a common reverse rotation circuit and is directly connected with the motor (M) in series, so that the rotating speed and the torsion of the motor (M) can be controlled by the same potentiometer (RP) no matter the motor rotates forward or reversely, and the operation of other circuit elements is not influenced.

In the figure, a first diode (VD 1) is firstly connected in series with the tail end of the positive pole in forward rotation and then connected in parallel with the negative pole in reverse rotation; the second diode (VD 2) is connected in series with the tail end of the positive pole of the reverse rotation operation and then connected in parallel with the negative pole of the forward rotation operation, so that the situation that the positive pole of one end of the motor (M) enables the relay of the other end to be attracted through the motor (M) to cause the short circuit of the whole circuit is prevented.

In the figure, a normal rotation limit switch (SQ 1) and a reverse rotation limit switch (SQ 2) adopt normally closed, duplex and reset micro switches, two parallel circuits can be simultaneously disconnected when the micro switches are pressed, and the two parallel circuits are simultaneously connected when the micro switches are reset, so that the motor runs in a limited stroke.

In the figure, the contact 1 and the contact 2 of the forward relay (K1) and the reverse relay (K2) are normally open contacts, the contact 3 is normally closed contacts, and the contact 3 is connected with the electromagnetic coil of the other relay in series, so that the forward relay (K1) and the reverse relay (K2) cannot act simultaneously to cause short circuit.

In the figure, a normally open reset type micro switch is adopted as the forward rotation switch (SR 1) and the reverse rotation switch (SR 2) and is used for starting a circuit.

The selection Switch (SH) in the figure adopts a double rocker switch which can simultaneously disconnect two parallel circuits or simultaneously connect two parallel circuits for selecting whether the motor automatically runs or not.

In the figure, a rocker switch or a button switch is adopted as a main Switch (SBE), the whole circuit can normally operate when the main Switch (SBE) is switched on, and meanwhile, the main Switch (SBE) is also an emergency stop switch, and the whole circuit is powered off and stops operating when the main Switch (SBE) is switched off.

In fig. 2, when the forward rotation switch (SR 1) is pressed to be closed, the coil inside the forward rotation relay (K1) is energized to generate a magnetic field, the contact 1 and the contact 2 inside the forward rotation relay (K1) are closed, and the motor (M) is switched on to start to operate the positive electrode and the negative electrode; because the positive level passes through the contact 1 in the forward relay (K1) and then is directly connected with the coil in the forward relay (K1) in parallel, the coil in the forward relay (K1) is continuously supplied with power, the motor (M) also continuously supplies power to continuously operate, and even if the forward switch (SR 1) is disconnected due to resetting, the automatic continuous forward operation of the motor (M) is not influenced.

In fig. 2, when the forward rotation relay (K1) is engaged, the contact 3 inside it is in an open state, and therefore the reverse rotation switch (SR 2) cannot trigger any circuit element.

In fig. 2, when the predetermined stroke is reached, the forward rotation limit switch (SQ 1) is activated, the motor (M) and the coil inside the forward rotation relay (K1) are simultaneously turned off from the positive electrode to stop the operation, and the circuit automatically stops the operation.

In fig. 2, before the forward rotation limit switch (SQ 1) is reset, the forward rotation switch (SR 1) cannot control the motor (M) to operate any more, and the forward rotation relay (K1) cannot be operated continuously.

In fig. 3, when the selector Switch (SH) is in an off state and the forward switch (SR 1) is pressed to close, the coil inside the forward relay (K1) is energized to generate a magnetic field, the contact 1 and the contact 2 inside the forward relay (K1) are closed, and the motor (M) starts to operate by connecting the positive electrode and the negative electrode; because the contact 1 in the forward rotation relay (K1) is disconnected, the motor (M) and the coil in the forward rotation relay (K1) can only be powered by the forward rotation switch (SR 1) to operate, and therefore when the forward rotation switch (SR 1) is disconnected due to resetting, the whole circuit can also stop running.

In fig. 4, the operating principle is the same as that of fig. 2, but the positive and negative stages connected to the motor (M) are reversed.

In fig. 5, the operating principle is the same as that of fig. 3, but the positive and negative stages connected to the motor (M) are reversed.

Claims

1. A direct current motor driving circuit is characterized in that when a forward rotation switch (SR 1) is pressed to be closed, an internal coil of a forward rotation relay (K1) is electrified to generate a magnetic field, a contact 1 and a contact 2 in the forward rotation relay (K1) are closed, and a motor (M) is connected with a positive pole and a negative pole to start running; because the positive level passes through the contact 1 in the forward relay (K1) and then is directly connected with the coil in the forward relay (K1) in parallel, the coil in the forward relay (K1) is continuously supplied with power, the motor (M) also continuously supplies power to continuously operate, and even if the forward switch (SR 1) is disconnected due to resetting, the automatic continuous forward operation of the motor (M) is not influenced.

2. The circuit of claim 1, wherein when the forward relay (K1) is engaged, the internal contacts 3 are open, so that the reverse switch (SR 2) cannot trigger any circuit element.

3. The circuit of claim 1, wherein the forward rotation limit switch (SQ 1) is activated when the circuit reaches a predetermined stroke, the motor (M) and the coil inside the forward rotation relay (K1) are simultaneously turned off to stop the operation, and the circuit automatically stops the operation.

4. The circuit of claim 1, wherein the forward switch (SR 1) is no longer able to control the operation of the motor (M) and the forward relay (K1) is no longer able to continue to operate until the forward limit switch (SQ 1) is reset.

5. A circuit as claimed in claim 1, characterized in that the circuit operates on the same principle for forward and reverse rotation, but with opposite positive and negative stages connected to the motor (M).

6. A circuit as claimed in claim 1, characterized in that the forward limit switch (SQ 1) and the reverse limit switch (SQ 2) are normally closed, double-coupled, reset-type microswitches which, when stressed, simultaneously open the two parallel circuits and, when reset, simultaneously close the two parallel circuits, so that the motor operates within a limited stroke.

7. The circuit of claim 1, wherein when the circuit is operated in forward rotation, the first diode (VD 1) is turned on and does not affect the operation of the circuit, but the second diode (VD 2) is blocked to prevent current from passing through and prevent the whole circuit from short-circuiting; when the circuit is operated in the reverse direction, the second diode (VD 2) is conducted, the circuit operation is not influenced, but the first diode (VD 1) is blocked, so that current cannot pass through, and the whole circuit is prevented from being short-circuited.