CN203491931U - Squirrel-cage motor soft starter - Google Patents

Abstract

The utility model discloses a squirrel-cage motor soft starter, which comprises a motor main switch, a fault switch connected with the motor main switch, a control bypass contactor passive contact switch, and a control bypass contactor passive contact The reset switch connected with the switch, the quick stop switch connected with the reset switch, the soft stop switch connected with the quick stop switch, the soft start switch connected with the soft stop switch, and the common terminal connected with the soft start switch, and The running signal switch connected to the fault switch, and the power interface connected to the running signal switch; the new squirrel cage motor soft starter not only has overload, overcurrent and phase loss protection functions, but also has reset, soft stop and quick stop functions , more comprehensive protection of the use of the motor.

Description

Soft starter for squirrel cage motor

technical field

The utility model relates to a soft starter for a squirrel cage motor.

Background technique

Squirrel-cage three-phase asynchronous motors are the most widely used electrical equipment. The traditional starting methods include star-delta starting, auto-coupling decompression starting, reactor decompression starting, and Yanbian delta decompression starting. Stage decompression starts. Their common feature is that the control circuit is simple, but the starting torque is not adjustable, and there is a large inrush current during the starting process, which makes the dragged load suffer a large mechanical impact, and is easily affected by the grid voltage fluctuation. Once the grid voltage Fluctuation will cause difficulty in starting and even stall the motor. Several start-up methods during shutdown are instantaneous power failures, which will also cause severe grid voltage fluctuations and mechanical shocks. Therefore, a soft starter device is needed to slowly load the motor. Most soft starters on the market only have overcurrent, overload, and phase loss protection functions, which cannot meet the needs of industrial development.

Utility model content

The technical problem to be solved by the utility model is to provide a squirrel-cage motor soft starter not only with overload, overcurrent and phase loss protection functions, but also with reset, soft stop and quick stop functions.

In order to solve the above problems, the utility model adopts the following technical scheme: a squirrel-cage motor soft starter, including a motor master switch and a fault switch connected to the motor master switch and a control bypass contactor passive contact switch, the described The passive contact switch of the control bypass contactor is connected to the reset switch, the reset switch is connected to the quick stop switch, the quick stop switch is connected to the soft stop switch, the soft stop switch is connected to the soft start switch, the soft start switch is connected to the common terminal, and the fault switch is connected to The running signal switch is connected to the power interface, and the power interface is connected to the common terminal.

Preferably, an ammeter is connected in parallel on the line between the power supply interface and the common terminal.

Preferably, a grounding device is connected to the power interface.

The beneficial effects of the utility model are: the new squirrel cage motor soft starter not only has overload, overcurrent and phase loss protection functions, but also has reset, soft stop and quick stop functions, which more comprehensively protects the use of the motor.

Description of drawings

Fig. 1 is a schematic diagram of a soft starter for a squirrel-cage motor of the present invention.

In the figure: 1. Motor main switch; 2. Control bypass contactor passive contact switch; 3. Reset switch; 4. Quick stop switch; 5. Soft quick stop switch; 6. Soft start switch; 7. Common terminal; 8. Fault switch; 9. Running signal switch; 10. Power interface; 11. Grounding device.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, but should not be construed as limiting the present utility model.

In the description of the present utility model, unless otherwise stipulated and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be The internal communication between two elements may be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.

Referring to Fig. 1, a soft starter for a squirrel-cage motor includes a motor main switch 1 and a fault switch 8 connected to the motor main switch 1 and a control bypass contactor passive contact switch 2, the control bypass The contactor passive contact switch 2 is connected to the reset switch 3, the reset switch 3 is connected to the quick stop switch 4, the quick stop switch 4 is connected to the soft stop switch 5, the soft stop switch 5 is connected to the soft start switch 6, and the soft start switch 6 is connected to the common terminal 7. The fault switch 8 is connected to the operation signal switch 9 , the operation signal switch 9 is connected to the power interface 10 , and the power interface 10 is connected to the common terminal 7 .

An ammeter is connected in parallel on the line between the power interface 10 and the common terminal 7 . A grounding device 11 is connected to the power interface 10 .

When the motor is working, the running signal switch 9 is closed. When the quick stop switch 4 is turned off, the motor can stop quickly. When the soft stop switch 5 is opened, the soft start starts, the motor stops slowly, the soft start switch 6 is connected, and the soft start is opened. The motor starts slowly, and when the motor breaks down, closing the fault switch 8 can remove the fault state.

The beneficial effects of the utility model are: the new squirrel cage motor soft starter not only has overload, overcurrent and phase loss protection functions, but also has reset, soft stop and quick stop functions, which more comprehensively protects the use of the motor.

In the description of this specification, descriptions referring to the terms "one embodiment", "example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or examples are included in the present invention. In at least one embodiment or example of . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications, the scope of the present invention is defined by the claims and their equivalents.

Claims (3)

1. a squirrel-cage motor soft initiator, it is characterized in that, the breakdown switch that comprises motor master switch and be connected with motor master switch and the passive contact switch of control bypass contactor, the passive contact switch of described control bypass contactor connects reset switch, reset switch connects fast guard's valve, described fast guard's valve connects soft shutdown switch, soft shutdown switch connects soft start switch, soft start switch connects public end, described breakdown switch connects run signal switch, run signal switch connects power interface, and described power interface is connected with public end.

2. squirrel-cage motor soft initiator according to claim 1, is characterized in that, an ammeter in parallel on the circuit between described power interface and public end.

3. squirrel-cage motor soft initiator according to claim 1, is characterized in that, on described power interface, is connected with earthing device.

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