Alternating current motor starter

Abstract

The utility model relates to the technical field of alternating current motors, in particular to an alternating current motor starter, which comprises a three-phase motor circuit, a starter circuit and a transformer circuit which are connected with the three-phase motor circuit, and a fuse FU connected with a protection circuit between the three-phase motor circuit and the starter circuit. The starter circuit is used for protecting stable starting of the three-phase motor; the transformer circuit is used for converting voltage and current output by a power supply and providing drive for a three-phase motor; the indicator lamp circuit is connected with the starter circuit and used for prompting the running state of the three-phase motor, and the starter switch circuit is connected with the transformer circuit and used for controlling the starting and stopping states of the starter. According to the utility model, input voltage is converted through the transformer circuit, stable driving voltage is provided for the three-phase motor circuit, the starter circuit and the indicating lamp circuit, the operating state of the three-phase motor is provided through the indicating lamp circuit, and the starting and stopping of the three-phase motor are controlled through the starter circuit.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of alternating current motor, concretely is an alternating current motor starter. BACKGROUND

[0002] The alternating current motor is a machine for realizing the mutual conversion of mechanical energy and alternating current energy. Due to the great development of alternating current power system, the alternating current motor has become the most commonly used motor.

[0003] The motor starter is a device for assisting the starting of the motor, and the motor starter can make the starting of the motor stable, the impact on the power grid is small, and the motor starter can also realize the soft parking, braking, overload and open-phase protection of the motor. The motor starter is mainly used in large motors, asynchronous motors and alternating current motors.

[0004] In the prior art, the control circuit of a soft starter with the publication number CN204244113U, the application includes a motor main circuit and a motor control circuit, wherein the motor main circuit includes a motor connected to a three-phase alternating current power supply, a soft starter connected between the three-phase alternating current power supply and the motor, and a bypass contactor connected between the three-phase alternating current power supply and the motor. One end of the normally open main contact of the bypass contactor is connected to the three-phase alternating current power supply, and the other end of the normally open main contact of the bypass contactor is connected to the motor. The motor control circuit is a control circuit composed of a motor starting switch, a motor stopping switch, an intermediate relay and a time relay. The control circuit of the soft starter can effectively prevent the motor from stopping due to the failure of the soft starter during normal operation, and can also obtain the running state parameters of the motor at any time.

[0005] In combination with the above application, the existing starter still has the following problems:

[0006] The general starter is prone to short circuit of the starter circuit under abnormal running state, which damages the normal operation of the starter and cannot provide safety protection for the three-phase motor. Therefore, the utility model provides an alternating current motor starter. UTILITY MODEL CONTENTS

[0007] The utility model aims at providing an alternating current motor starter to solve the problems in the above background technology.

[0008] To achieve the above purpose, the utility model provides the following technical scheme:

[0009] An alternating current motor starter, comprising:

[0010] A three-phase motor circuit, a starter circuit and a transformer circuit connected to the three-phase motor circuit, a fuse FU of a protection circuit connected between the three-phase motor circuit and the starter circuit;

[0011] The starter circuit is used for protecting the three-phase motor to start smoothly.

[0012] The transformer circuit is used for transforming the voltage and current of the power output and providing the driving of the three-phase motor.

[0013] The indicator lamp circuit connected with the starter circuit is used for prompting the running state of the three-phase motor, and the starter switch circuit connected with the transformer circuit is used for controlling the on-off state of the starter.

[0014] Preferably, the three-phase motor circuit comprises:

[0015] The three-phase AC motor D1 and the three-phase AC motor D2 are connected with the three-phase input power through the R terminal, the S terminal and the T terminal.

[0016] Preferably, the three connection lines of the three-phase AC motor D1 are connected with the capacitor C2, and the three connection lines of the three-phase AC motor D2 are connected with the capacitor C3.

[0017] Preferably, the starter circuit comprises:

[0018] The AC contactor CJ1, the AC contactor CJ2 and the AC contactor CJ3, one end of the AC contactor CJ1 is connected with the motor starting switch QA, and one end of the motor starting switch QA is connected with the fuse FU.

[0019] Preferably, one end of the AC contactor CJ2 is connected with the relay J, and one end of the relay J is connected between the fuse FU and the motor starting switch QA.

[0020] One end of the AC contactor CJ3 is connected between the relay J and the AC contactor CJ2.

[0021] Preferably, the indicator lamp circuit comprises:

[0022] The indicator lamp HL1 and the indicator lamp HL2, one end of the indicator lamp HL1 and the indicator lamp HL2 is connected with the intermediate relay CJ2.

[0023] Preferably, the transformer circuit comprises:

[0024] The transformer, the model of the transformer is BKZ-3000VA, and one end of the transformer is connected with the C phase of the three-phase motor.

[0025] Preferably, the starter switch circuit comprises:

[0026] Relays XJ1-1 and XJ2-2 are provided. One end of relay XJ1-1 is connected to intermediate relay CJ1. One end of relay XJ2-2 is connected to contact point XJ2. One end of contact point XJ2 is connected to contact point XJ1. One end of contact point XJ1 is connected to relay J.

[0027] Preferably, one end of relay J is connected to intermediate relay CJ1.

[0028] Compared with the prior art, the beneficial effects of this utility model are:

[0029] This invention converts the input voltage through a transformer circuit and provides a stable driving voltage for the three-phase motor circuit, starter circuit, and indicator light circuit. The indicator light circuit provides the operating status of the three-phase motor, and the starter circuit controls the starting and stopping of the three-phase motor.

[0030] This invention can protect the circuit using a fuse. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this utility model;

[0032] Figure 2 This is a schematic diagram of the three-phase motor circuit of this utility model;

[0033] Figure 3 This is a schematic diagram of the starter circuit of this utility model;

[0034] Figure 4 This is a schematic diagram of the indicator light circuit of this utility model;

[0035] Figure 5 This is a schematic diagram of the starter switch circuit of this utility model;

[0036] Figure 6 This is a schematic diagram of the transformer circuit of this utility model. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] Example 1:

[0039] Please see Figures 1-6 An AC motor starter, comprising:

[0040] Three-phase motor circuit, and starter circuit and transformer circuit connected with the three-phase motor circuit, the fuse FU of the protection circuit is connected between the three-phase motor circuit and the starter circuit;

[0041] The starter circuit is used for protecting the three-phase motor to start smoothly.

[0042] The transformer circuit is used for transforming the voltage and current output by the power supply, and providing the driving of the three-phase motor.

[0043] The indicator lamp circuit connected with the starter circuit is used for prompting the running state of the three-phase motor, and the starter switch circuit connected with the transformer circuit is used for controlling the on-off state of the starter.

[0044] Embodiment 2:

[0045] On the basis of embodiment 1, the three-phase motor is further disclosed.

[0046] As shown in Figure 2 , the three-phase motor circuit comprises:

[0047] The three-phase alternating current motor D1 and the three-phase alternating current motor D2 are connected with the three-phase input power supply through the R terminal, the S terminal and the T terminal.

[0048] The three access lines of the three-phase alternating current motor D1 are connected with the capacitor C2, and the three access lines of the three-phase alternating current motor D2 are connected with the capacitor C3.

[0049] Embodiment 3:

[0050] On the basis of embodiment 1, the starter circuit is further disclosed.

[0051] As shown in Figure 3 , the starter circuit comprises:

[0052] The alternating current contactor CJ1, the alternating current contactor CJ2 and the alternating current contactor CJ3, one end of the alternating current contactor CJ1 is connected with the motor starting switch QA, one end of the motor starting switch QA is connected with the fuse FU;

[0053] One end of the alternating current contactor CJ2 is connected with the relay J, one end of the relay J is connected between the fuse FU and the motor starting switch QA;

[0054] One end of the alternating current contactor CJ3 is connected between the relay J and the alternating current contactor CJ2.

[0055] Embodiment 4:

[0056] On the basis of embodiment 1, the indicator lamp circuit is further disclosed.

[0057] As shown in Figure 4As shown in the figure, the indicator lamp circuit comprises:

[0058] The indicator lamp HL1 and the indicator lamp HL2 are both connected to the intermediate relay CJ2 at one end.

[0059] Embodiment 5:

[0060] On the basis of embodiment 1, the transformer circuit is further disclosed.

[0061] As shown in the figure, the transformer circuit comprises: Figure 5

[0062] The transformer is a BKZ-3000VA transformer, and one end of the transformer is connected to the C phase of the three-phase motor.

[0063] Embodiment 6:

[0064] On the basis of embodiment 1, the starter switch circuit is further disclosed.

[0065] As shown in the figure, the starter switch circuit comprises: Figure 6

[0066] The relay XJ1-1 is connected to the intermediate relay CJ1 at one end, and the relay XJ2-2 is connected to the contact XJ2 at one end, the contact XJ2 is connected to the contact XJ1 at one end, the contact XJ1 is connected to the relay J at one end, and the relay J is connected to the intermediate relay CJ1 at one end.

[0067] In summary, the above embodiments 1-6 are shown, the starter switch circuit is opened, 24V power is input, the input voltage is converted through the transformer circuit, the driving voltage is provided for the three-phase motor circuit, the starter circuit and the indicator lamp circuit, the running state of the three-phase motor is provided through the indicator lamp circuit, and the start and stop of the three-phase motor is controlled through the starter circuit.

[0068] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.​​

Claims

1. An alternating current motor starter, characterized by, It includes: Three-phase motor circuit, and starter circuit and transformer circuit connected with three-phase motor circuit, the fuse FU of protection circuit is connected between three-phase motor circuit and starter circuit; The starter circuit is used for protecting three-phase motor smooth start; The transformer circuit is used for transforming voltage and current of power supply output, and providing driving for three-phase motor; The indicator lamp circuit connected with the starter circuit is used for prompting running state of three-phase motor, and the starter switch circuit connected with the transformer circuit is used for controlling on-off state of starter.

2. An AC motor starter according to claim 1, characterized in that The three-phase motor circuit includes: Three-phase AC motor D1 and three-phase AC motor D2, which are connected with three-phase input power supply through R end, S end and T end.

3. An AC motor starter according to claim 2, wherein The three access lines of three-phase AC motor D1 are connected with capacitor C2, and the three access lines of three-phase AC motor D2 are connected with capacitor C3.

4. An AC motor starter according to claim 1, wherein The starter circuit includes: AC contactor CJ1, AC contactor CJ2 and AC contactor CJ3, one end of AC contactor CJ1 is connected with motor start switch QA, and one end of motor start switch QA is connected with fuse FU.

5. An AC motor starter according to claim 4 wherein, One end of AC contactor CJ2 is connected with relay J, and one end of relay J is connected between fuse FU and motor start switch QA; One end of AC contactor CJ3 is connected between relay J and AC contactor CJ2.

6. An AC motor starter according to claim 1, wherein The indicator lamp circuit includes: Indicator lamp HL1 and indicator lamp HL2, one end of indicator lamp HL1 and indicator lamp HL2 is connected with intermediate relay CJ2.

7. An AC motor starter according to claim 1, wherein The transformer circuit includes: Transformer, the model of transformer is BKZ-3000VA, and one end of transformer is connected with C phase of three-phase motor.

8. An AC motor starter according to claim 7 wherein, The starter switch circuit includes: Relay XJ1-1 and relay XJ2-2, one end of relay XJ1-1 is connected with intermediate relay CJ1, one end of relay XJ2-2 is connected with contact XJ2, one end of contact XJ2 is connected with contact XJ1, and one end of contact XJ1 is connected with relay J.

9. An AC motor starter according to claim 8 wherein, One end of relay J is connected with intermediate relay CJ1.

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