Motor starting device

Abstract

The invention discloses a motor starting device which comprises an arc extinguishing cover, a static core and a moving core arranged in the arc extinguishing cover, and a contact plate arranged above the arc extinguishing cover. Two ends of the bottom of the contact plate are provided with moving contact points. The top of the arc extinguishing cover is provided with static contacts which are corresponding to the moving contact points one to one. The static cores are in the shape of a hollow cylinder. An insulation sheath goes through the center of the static core and is internally provided with multiple parallel conductive wires. A conductive wire at the same side of the static core goes through the insulation sheath and then is split into two wire harnesses. Two sides of the static core are provided with two mounting grooves which are internally provided with wire connection bodies. The wire harnesses are connected to the wire connection bodies through a metal connection plate. The motor starting device provided by the invention has reasonable space utilization and can adapt to large impact current.

Description

technical field [0001] The present invention relates to the technical field of motors, and more specifically relates to a motor starting device. Background technique [0002] In the prior art, the motor starting device uses a static iron core and a moving iron core to directly drive the closing and opening of the contacts. The closing and opening are not fast enough to respond to the large inrush current in time, and it is easy to cause damage to the line. It is easy to burn under the impact of the impact current; the static iron core and the moving iron core used in the existing motor starting device are E-shaped or U-shaped, occupying a large space of the starter, and the space utilization is unreasonable. In addition, the E-shaped or U-shaped static iron core A spiral coil is wound on top to achieve the purpose of on-off contacts. Due to the performance limitations of the wire itself and the space limitation of the starter, the cross-sectional area of ​​the wire is limite...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the motor starting device uses a static iron core and a moving iron core to directly drive the closing and opening of the contacts. The closing and opening are not fast enough to respond to the large inrush current in time, and it is easy to cause damage to the line. It is easy to burn under the impact of the impact current; the static iron core and the moving iron core used in the existing motor starting device are E-shaped or U-shaped, occupying a large space of the starter, and the space utilization is unreasonable. In addition, the E-shaped or U-shaped static iron core A spiral coil is wound on top to achieve the purpose of on-off contacts. Due to the performance limitations of the wire itself and the space limitation of the starter, the cross-sectional area of ​​the wire is limited within a certain range and cannot be too large. Therefore, the current that the coil can withstand It cannot be too large. When the current passing through is relatively large, a longer wire needs to be wound to meet the requirements, but the longer the wire is wound, the larger the E-shaped or U-shaped static iron core and the moving iron core are required. It cannot match the actual size of the launcher, and there is insufficient space

[0003] When a large current is disconnected, a strong arc will be generated between the moving and static contacts. The arc is the discharge phenomenon of the gas between the contacts under the action of a strong electric field. In a circuit with contacts, the arc will It is inevitable that the arc will ablate the contacts on the one hand, shorten the service life and reduce the reliability of work. , the arc between the contacts needs to be extinguished quickly

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