Manual star-delta step-down starter of motor

Abstract

The utility model relates to the technical field of starters, in particular to a manual star-delta step-down starter of a motor, which comprises a step-down starter and a motor junction box, a wiring point A1, a wiring point A2, a wiring point A3, a wiring point B1, a wiring point B2 and a wiring point B3 are arranged on the step-down starter, a wrench L is connected with a middle rotating shaft LZ, three sliding contact pieces D1, D2 and D3 are fixed at the positions B1, B2 and B3 on the shaft, and the middle rotating shaft LZ is connected with the motor junction box. The three contact sheets D1, D2 and D3 are insulated from the shaft; compared with the prior art, the utility model has the advantages of reasonable and novel structural design, simple circuit and low cost, is not only suitable for rural farms and individual farmers, but also can be used as a tail end starting switch for all three motors which work independently within 5-50 kilowatts, so that the service life of the motor is prolonged. The step-down starter can prevent large impact current from damaging line equipment, and is simple to install. Use is safe and reliable, and good popularization prospects and economic values are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of starters, in particular to a manual star-delta step-down starter for an electric motor. Background Art

[0002] In the existing auto-coupling step-down starter for large motors, the three-phase lines A, B, and C first enter the auto-coupling step-down starter. When starting, after the voltage is reduced by the step-down device in the auto-coupling step-down starter, they are correspondingly connected to the connectors 1, 2, and 3 of the large motor. At the same time, the connector 1 on the large motor is connected to the connector 6, the connector 2 is connected to the connector 4, and the connector 3 is connected to the connector 5 with a copper sheet. The auto-coupling step-down starter includes a box body, a start-up handle and a stop button are provided outside the box body, an insulating shaft connected to the start-up handle is provided inside the box body, and three contacts are provided on the insulating shaft; transformer oil is installed inside the box body; there are three operating contacts and three starting contacts in the transformer oil; three incoming wire connectors, three outgoing wire connectors, and a thermal relay are provided on the upper part of the box body; there is an electromagnetic valve mechanism inside the box body; an incoming wire hole and an outgoing wire hole are provided on the upper wall of the box body, and the auto-coupling step-down starter is also provided with a step-down device inside the box body. Although the autocoupler step-down starter of the large motor is commonly used, it has the disadvantages of high power consumption, difficult heat dissipation, short one-time working time, short service life, complex structure, large consumables, high price, and difficult maintenance. Therefore, it needs to be improved. Utility Model Content

[0003] The purpose of the utility model is to solve the problems existing in the background technology, reduce the impact current generated when the motor starts, protect the safety of circuit facilities, and low-speed starting can also have extremely high safety for some machines and equipment, such as band saws, reduce installation technology, reduce installation costs, and provide a manual star-delta step-down starter for an electric motor.

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is as follows: a manual star-delta step-down starter for an electric motor, comprising a step-down starter and a motor junction box, the step-down starter is provided with a wiring point A1, a wiring point A2, a wiring point A3, a wiring point B1, a wiring point B2, a wiring point B3, a wrench L, an intermediate shaft LZ, and contact pieces D1, D2, and D3, when the wrench L is moved, the contact pieces D1, D2, and D3 on the intermediate shaft LZ will respectively produce clutch on the three-wire common contact and the wiring point A1, the wiring point A2, and the wiring point A3 contact, the motor junction box is provided with a wiring point a1, a wiring point a2, a wiring point a3, a wiring point b1, a wiring point b2, and a wiring point b3, and the wrench L controls the star connection and delta connection of the internal coil of the motor;

[0005] Wiring point A1 is electrically connected to wiring point a3, and both are connected to air switch conductor V1; wiring point A2 is electrically connected to wiring point a2, and both are connected to air switch conductor V2; wiring point A3 is electrically connected to wiring point a1, and both are connected to air switch conductor V3;

[0006] The wiring point B1 is electrically connected to the wiring point b3, the wiring point B2 is electrically connected to the wiring point b2, and the wiring point B3 is electrically connected to the wiring point b1.

[0007] Preferably, when the wrench L is turned, the three contacts D1, D2, and D3 on the intermediate shaft LZ are in contact with the wiring point A1, the wiring point A2, and the wiring point A3 respectively, which is the running gear N2 and the running state.

[0008] Preferably, when the wrench L is turned and the three contacts D1 , D2 , and D3 on the intermediate shaft LZ contact the three-wire common contact 3 , it is the start gear N1 , which is the start state.

[0009] Preferably, when the wrench L is turned, the three contacts D1, D2, D3 on the intermediate shaft LZ are not in contact with the wiring point A1, the wiring point A2, the wiring point A3, and the three-wire common contact 3, which is the neutral position O.

[0010] Features of the utility model: 1. This starter has few contacts and simple circuits. Users with a little knowledge of electricity can install it by themselves without the help of professionals, saving or reducing labor costs. 2. The total cost of purchasing or assembling various step-down starting devices from the market is at least three to five hundred yuan, or even several thousand yuan, while this starter only costs a few dozen yuan, which allows users to spend less money to achieve the same purpose and prevent impact current from damaging line equipment. This is the purpose of my invention. 3. Equipment use conditions: Suitable for rural farms, individual breeders, and mechanical equipment that must be slowed down for starting. Of course, three-phase motors that work independently within 5 kW to 50 kW can be used as end starting switches. Note: Try to start with a light load.

[0011] The utility model has the following advantages: reasonable and novel structural design, simple circuit, low cost, suitable for rural farms and individual breeders, and three-phase motors working independently within 5 kW to 50 kW can be used as terminal starting switches. This step-down starter can avoid damage to line equipment caused by large impact currents, protect the safety of line equipment, and is safe, reliable, and has good promotion prospects and economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0013] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0014] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0015] In the description of the embodiments of the present utility model, if a feature is referred to as being "set", "fixed", "connected", or "installed" on another feature, it may be directly set, fixed, or connected on the other feature, or it may be indirectly set, fixed, connected, or installed on the other feature. In the description of the embodiments of the present utility model, if "several" is involved, it means more than one, if "multiple" is involved, it means more than two, if "greater than", "less than", or "exceeds" is involved, it should be understood as not including the number itself, and if "above", "below", or "within" is involved, it should be understood as including the number itself. If "first" or "second" is involved, it should be understood as being used to distinguish technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0016] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0017] The preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0018] Example

[0019] In conjunction with the accompanying drawings, a manual star-delta step-down starter for an electric motor comprises a step-down starter 1 and a motor junction box 2. The step-down starter is provided with a wiring point A1, a wiring point A2, a wiring point A3, a wiring point B1, a wiring point B2, a wiring point B3, a wrench L, an intermediate shaft LZ, contact pieces D1, D2, D3, and a three-wire common contact 3. The motor junction box is provided with a wiring point a1, a wiring point a2, a wiring point a3, a wiring point b1, a wiring point b2, and a wiring point b3. The wrench L controls the reverse clutch of the three contact pieces D1, D2, and D3 on the intermediate shaft.

[0020] Wiring point A1 is electrically connected to wiring point a3, and both are connected to air switch conductor V1; wiring point A2 is electrically connected to wiring point a2, and both are connected to air switch conductor V2; wiring point A3 is electrically connected to wiring point a1, and both are connected to air switch conductor V3;

[0021] The wiring point B1 is electrically connected to the wiring point b3, the wiring point B2 is electrically connected to the wiring point b2, and the wiring point B3 is electrically connected to the wiring point b1.

[0022] As a preferred implementation scheme of this embodiment, when the wrench L is turned, the three contacts D1, D2, and D3 on the intermediate shaft LZ are in contact with the wiring point A1, the wiring point A2, and the wiring point A3 respectively, which is the running gear N2 and the running state.

[0023] As a preferred implementation scheme of this embodiment, when the wrench L is turned, when the three contacts D1, D2, and D3 on the intermediate shaft LZ are in contact with the three-wire common contact 3 at the same time, it is the starting gear N1, which is the starting state.

[0024] As a preferred implementation scheme of this embodiment, when the wrench L is turned, the three contacts D1, D2, and D3 on the intermediate shaft LZ are not in contact with the wiring point A1, the wiring point A2, the wiring point A3, and the three-wire common contact 3 respectively, which is the neutral position O.

[0025] Working principle of the utility model: working principle of xy-△ type step-down starter, V1*V2*V3, is the three-phase alternating current input through the air switch or the main switch, directly enters the connection points of A1*A2*A3 in N2 and a1*a2*a3 in the motor junction box, when the wrench L is moved from the neutral position 0 to the N1 starting position, the three-wire common contact short-circuits the starter B1*B2*B3, and at the same time, b1*b2*b3 in the motor junction box also becomes a short-circuit state, then the three groups of coils in the motor form a star connection, each group of coils obtains a voltage of 220 volts, then the motor starts to start and accelerates, according to the load size, about ten seconds, the motor speed is increased to close to the normal operating speed, then the handle L is quickly moved from N1 to N2 position, the three groups of coils in the motor become a triangle connection, at the same time, each group of coils obtains a voltage of 380 volts, and the motor operates normally.

[0026] The technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. The above-described embodiments only express several implementation methods of the utility model, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the utility model, several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A manual star-delta step-down starter for an electric motor, characterized in that: It includes a step-down starter and a motor junction box. The step-down starter is provided with a junction point A1, a junction point A2, a junction point A3, a junction point B1, a junction point B2, a junction point B3, a wrench L, an intermediate shaft LZ, contact pieces D1, D2, D3, and a three-wire common contact. The motor junction box is provided with a junction point a1, a junction point a2, a junction point a3, a junction point b1, a junction point b2, and a junction point b3. The wrench L controls the junction points B1, B2, and B3 on the intermediate shaft LZ. The junction points B1, B2, and B3 are respectively connected to the three contact pieces D1, D2, and D3, and are insulated from the intermediate shaft LZ. Wiring point A1 is electrically connected to wiring point a3, and both are connected to air switch conductor V1; wiring point A2 is electrically connected to wiring point a2, and both are connected to air switch conductor V2; wiring point A3 is electrically connected to wiring point a1, and both are connected to air switch conductor V3; The wiring point B1 is electrically connected to the wiring point b3, the wiring point B2 is electrically connected to the wiring point b2, and the wiring point B3 is electrically connected to the wiring point b1.

2. A manual star-delta step-down starter for an electric motor according to claim 1, characterized in that: When the three contact pieces D1, D2, and D3 on the intermediate shaft LZ of the wrench L are connected to the three contacts A1, A2, and A3 respectively, it is the operating gear N2, and it is in the operating state.

3. A manual star-delta step-down starter for an electric motor according to claim 2, characterized in that: When the three contact pieces D1, D2, and D3 on the intermediate shaft LZ of the wrench L are connected to the common contact 3 at the same time, it is the starting gear N1, and it is in the starting state.

4. The manual star-delta step-down starter for an electric motor according to claim 3, characterized in that: When the three contact pieces D1, D2, and D3 on the intermediate shaft LZ of the wrench L are not in contact with the wiring point A1, the wiring point A2, the wiring point A3, and the three-wire common contact, it is in the neutral position O.

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