CN210958206U

CN210958206U - Associated power supply of direct current motor with protection device

Info

Publication number: CN210958206U
Application number: CN201922185696.0U
Authority: CN
Inventors: 句希源; 孙昊; 杜文霞; 杜海莲; 辛涛; 吕锋
Original assignee: Hebei Normal University
Current assignee: Hebei Normal University
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-07-07
Anticipated expiration: 2029-12-09

Abstract

The utility model relates to a DC motor associated power supply with a protection device, which consists of an armature power supply circuit, an excitation power supply circuit, a linkage circuit and a control circuit; the armature power supply circuit is connected with the excitation power supply circuit in parallel; the armature power supply circuit consists of a normally open contact of a cascaded armature power switch and a direct current adjustable current module, and the excitation power supply circuit consists of a normally open contact of a cascaded excitation power switch and a fixed direct current rectification module; the linkage circuit comprises a coil of a voltage relay, a solid-state relay, a linkage duplex potentiometer and a normally closed contact of an armature power switch; the utility model discloses a voltage relay detects excitation power supply voltage signal and accomplishes the output control to armature power, utilizes the coaxial linkage of duplex potentiometre and voltage relay, armature switch KM 2's normally open contact interlocking simultaneously, realizes the low-voltage zero-bit start to avoided motor power supply equipment operational failure, improved the reliability of direct current motor electrical power generating system operation.

Description

Associated power supply of direct current motor with protection device

Technical Field

The utility model relates to a DC motor is related to the power, especially relates to a take protection device's DC motor is related to the power, belongs to motor DC power protection technical field.

Background

The DC motor has larger starting torque and wider speed regulation range. Therefore, production machinery with high requirements on starting and speed regulation performance is widely driven by a direct current motor. The direct current associated power supply is a power supply for an excitation branch and a driving armature branch of the direct current motor. Due to the rapid development of the dc electric vehicle, the dc motor has an excessive current impact caused by the misoperation during the starting process, which causes the failure of the control system and the dc motor, resulting in the reduction of the service life, so it is important to design a reasonable protection device to avoid the occurrence of the failure. At present, the known protection methods mainly comprise an armature string resistor and an armature voltage reduction starting method, wherein the armature string resistor can switch resistors in a grading way in the starting process, but certain electric power needs to be consumed, and the impact current is still large, so that the damage of a power supply system is caused; the voltage reduction starting is to adjust the output voltage value of the speed regulator by changing the trigger angle of the silicon controlled rectifier, and the low voltage starting and the fault-free operation can not be ensured.

The optimal starting condition of the associated power supply is that the given potentiometer is at the zero position of the output voltage, and the excitation is electrified to generate a magnetic field. In order to meet the requirement, the excitation power supply branch is powered first, and the potentiometer is set to return to the initial position. And under the condition that the direct current power supply and the armature power supply meet the requirement at the same time, the direct current power supply is allowed to be associated to supply power for the driving armature branch, and the direct current motor is started and operated along with the gradual rise of the voltage. Typically, the above process is performed manually. If improper operation occurs, the motor power supply has an overcurrent fault. It is therefore necessary to design the associated power supply with protection means not allowing the supply of the associated power supply when the excitation branch is later than the supply of the driving armature branch or when a given potentiometer is not activated in the initial position.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a take protection device's associated power of DC motor.

In order to solve the technical problem, the utility model discloses a technical scheme is:

a DC motor associated power supply with a protection device comprises a main power supply circuit and a control circuit; the main power supply circuit comprises an armature power supply circuit, an excitation power supply circuit and a linkage circuit; the armature power supply circuit is connected with the excitation power supply circuit in parallel; the armature power supply circuit consists of a normally open contact of a cascaded armature power switch KM2 and a direct current adjustable current module, and the excitation power supply circuit consists of a normally open contact of a cascaded excitation power switch KM3 and a fixed direct current rectification module; the linkage circuit comprises a coil of a voltage relay KV1, a solid-state relay KV2, a duplex potentiometer RP1 and a normally closed contact of an armature power switch KM 2; two potentiometers of the duplex potentiometer RP1 are coaxially linked; a coil of the voltage relay KV1 is connected between the positive output end F1 and the negative output end F2 of the fixed direct-current rectifying module; the normally closed contact of the armature power switch KM2 is connected in series with the resistor body of the second potentiometer RP1-2 of the duplex potentiometer RP 1; two input ends of the solid-state relay KV2 are respectively connected with a second movable arm of the double potentiometer RP1 and a negative electrode output end F2 of the fixed direct current rectification module; a first potentiometer RP1-1 of the duplex potentiometer RP1 is connected with a given potential control input end of the direct current adjustable current module; the control circuit comprises a first branch, a second branch and a third branch which are connected in parallel; the first branch circuit comprises a coil of an armature power switch KM2, a normally closed contact of an intermediate relay KA, a control button SA1 of a fixed power rectification circuit, a normally open contact of an armature power switch KM2 and a normally open contact of a voltage relay KV 1; a coil of the armature power switch KM2, a normally closed contact of the intermediate relay KA, a control button SA1 of the fixed power rectification circuit and a normally open contact of the voltage relay KV1 are connected in series, and the normally open contact of the armature power switch KM2 is connected in parallel with the normally closed contact of the intermediate relay KA; the second branch circuit comprises a coil of the intermediate relay KA, one end of the coil of the intermediate relay KA is connected with a neutral point N pole of the alternating current power supply, the other end of the coil of the intermediate relay KA is connected with an output end OT2 of the solid-state relay KV2, and an output end OT1 of the solid-state relay KV2 is connected with a phase line L pole of the alternating current power supply; the third branch comprises a coil of a series excitation armature power switch KM3 and a governor rectifier circuit control button SA 2.

The direct-current motor associated power supply with the protection device further comprises a single-phase alternating-current power supply main switch KM1, a starting button SB1 and a stopping button SB 2; the normally open contact of the single-phase AC power main switch KM1 is connected in parallel with the start button SB1, and then connected in series between the L pole of the live wire and the N pole of the center point with the coil of the stop button SB2 and the single-phase AC power main switch KM 1.

The utility model discloses the beneficial effect who gains lies in:

1. the utility model discloses guarantee that the order control and the zero-bit start control that DC motor started have been realized in excitation power supply normal power supply and armature power supply when the zero-bit with the pair potentiometre.

The utility model discloses control simple structure, it is economical and practical, the debugging is convenient, easily operation realization.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments.

Example 1

The direct-current motor associated power supply with the protection device further comprises a single-phase alternating-current power supply main switch KM1, a starting button SB1 and a stopping button SB 2; the normally open contact of the single-phase alternating current power main switch KM1 is connected in parallel with the start button SB1, and then connected in series with the coils of the stop button SB2 and the single-phase alternating current power main switch KM1 between the phase line L pole and the neutral point N pole.

In order to guarantee that the associated power supply of DC motor moves safely and stably, the utility model discloses can be in the same place direct current adjustable current power module and the pair potentiometre of fixed direct current rectifier module through coaxial linkage are related, because misoperation overcurrent appears when avoiding the motor to start. When the direct current motor is started, the armature power supply is allowed to work after power is supplied to the excitation power supply loop, and meanwhile, the armature power supply is controlled to be adjusted from the minimum voltage, so that the current of the rectifying circuit is ensured to be within a safety range.

The starting button SB1, the stopping button SB2, the fixed power supply rectification circuit control button SA1 and the speed regulator rectification circuit control button SA2 are all manual switches, and the single-phase alternating-current power supply main switch KM1, the armature power supply switch KM2 and the excitation power supply switch KM3 are all alternating-current contactors which respectively control the power supply of the single-phase alternating-current power supply, the direct-current adjustable current module and the fixed direct-current rectification module. The voltage relay KV1 is used for monitoring the output voltage of the fixed direct current rectification module, and when no output voltage exists, the adjustable current module is not allowed to be electrified; and the voltage solid-state relay KV2 is used for completing zero starting control.

The control circuit functions as follows:

1. the AC power supply stops supplying power. The starting button SB1 makes the coil of the single-phase AC power main switch KM1 electrified and self-locked, the normally open contact is closed, and the AC power is connected. The stop button SB2 is actuated to turn off the power supply.

2. And controlling armature power supply.

Firstly, a duplex potentiometer RP1 is at a zero position, the input voltage of a solid-state relay KV2 is the minimum value, the output ends OT1 and OT2 are in an off state, a coil of an intermediate relay KA cannot be electrified, and a normally closed contact of the intermediate relay KA is closed; and meanwhile, the excitation power supply is switched on, the coil of the voltage relay KV1 is in an electrified state, and the normally open contact is closed to prepare for the operation of the armature power supply. The rotary switch of the starting button SA1 is closed, the coil of the armature power switch KM2 is electrified, the normally open contact of the armature power switch KM is closed, and the direct current adjustable current module is communicated with the alternating current power supply. If the movable arm of the double potentiometer RP1 is not at the minimum position, the input voltage of the solid-state relay KV2 exceeds the minimum control voltage, the output end of the solid-state relay KV2 is connected, the coil of the intermediate relay KA is electrified, the normally closed contact of the intermediate relay KA is disconnected, the armature power switch KM2 cannot be electrified for attraction, the direct-current adjustable current module cannot output direct-current voltage, and the normally open contact of the voltage relay KV1 completes the demagnetization protection.

3. And controlling a fixed rectification power supply. A speed regulator rectification circuit control button SA2 rotary switch is closed, an excitation power switch KM3 coil is electrified, a normally open contact of the speed regulator rectification circuit control button is closed, and a fixed direct current rectification module is electrified to work. Fuse FU is control short circuit protection.

The utility model discloses a voltage relay KV1 detects excitation power supply voltage signal and accomplishes the output control to armature power supply, utilizes the coaxial linkage of duplex potentiometre RP1 and voltage relay KV1, armature switch KM 2's normally open contact interlocking simultaneously, realizes the low-voltage zero-bit start to avoided motor power supply equipment operational failure, improved the reliability of system operation. When the voltage relay KV1 detects that there is an excitation output, the armature power switch KM2 is controlled to energize the dc adjustable current module. One-link potentiometer of the duplex potentiometer is connected with the direct current adjustable current module to serve as a given potentiometer for voltage and speed regulation. The other potentiometer is connected with the input end of the solid-state relay KV2 in parallel, the mechanical position of the given potentiometer is directly reflected by the coaxial and same-position characteristics of the double-potentiometer RP1, and when the sliding point of the potentiometer is not at a zero position or the voltage exceeds the minimum value, namely 10% of rated value, the direct-current adjustable current module does not allow starting and supplying power. The utility model discloses a protection mode of associated power controls fixed excitation rectifier module and direct current adjustable flow module, has reached the improvement reliability purpose.

Claims

1. A DC motor associated power supply with a protection device is characterized in that: the power supply circuit consists of a main power supply circuit and a control circuit; the main power supply circuit comprises an armature power supply circuit, an excitation power supply circuit and a linkage circuit; the armature power supply circuit is connected with the excitation power supply circuit in parallel; the armature power supply circuit consists of a normally open contact of a cascaded armature power switch KM2 and a direct current adjustable current module, and the excitation power supply circuit consists of a normally open contact of a cascaded excitation power switch KM3 and a fixed direct current rectification module; the linkage circuit comprises a coil of a voltage relay KV1, a solid-state relay KV2, a duplex potentiometer RP1 and a normally closed contact and a normally open contact of an armature power switch KM 2; two potentiometer copper shafts of the duplex potentiometer RP1 are linked; a coil of the voltage relay KV1 is connected between the positive output end F1 and the negative output end F2 of the fixed direct-current rectifying module; the normally closed contact of the armature power switch KM2 is connected in series with the resistor body of the second potentiometer RP1-2 of the duplex potentiometer RP 1; two input ends of the solid-state relay KV2 are respectively connected with a second movable arm of the double potentiometer RP1 and a negative electrode output end F2 of the fixed direct current rectification module; a first potentiometer RP1-1 of the duplex potentiometer RP1 is connected with a given potential control input end of the direct current adjustable current module; the control circuit comprises a first branch, a second branch and a third branch which are connected in parallel; the first branch circuit comprises a coil of an armature power switch KM2, a normally closed contact of an intermediate relay KA, a control button SA1 of a fixed power rectification circuit, a normally open contact of an armature power switch KM2 and a normally open contact of a voltage relay KV1 which are connected in series, and a coil of an armature power switch KM2, a normally closed contact of the intermediate relay KA, a control button SA1 of the fixed power rectification circuit and a normally open contact of the voltage relay KV 1; a normally open contact of the armature power switch KM2 is connected in parallel with a normally closed contact of the intermediate relay KA; the second branch circuit comprises a coil of the intermediate relay KA, one end of the coil of the intermediate relay KA is connected with a neutral point N pole of the alternating current power supply, the other end of the coil of the intermediate relay KA is connected with an output end OT2 of the solid-state relay KV2, and an output end OT1 of the solid-state relay KV2 is connected with a phase line L pole of the alternating current power supply; the third branch comprises a coil of a series excitation armature power switch KM3 and a governor rectifier circuit control button SA 2.

2. The dc motor-related power supply with protection device according to claim 1, characterized in that: the direct-current motor associated power supply with the protection device further comprises a single-phase alternating-current power supply main switch KM1, a starting button SB1 and a stopping button SB 2; the normally open contact of the single-phase alternating current power main switch KM1 is connected in parallel with the start button SB1, and then connected in series with the coils of the stop button SB2 and the single-phase alternating current power main switch KM1 between the phase line L pole and the neutral point N pole.