A brushless automatic control electric machine liquid resistance starter

Abstract

The invention discloses a brushless automatic control motor liquid resistance starter which belongs to the liquid starter, and aims at providing a brushless automatic control motor liquid resistance starter which not only can continuously and steadily basic constant torque soft starting, but also can repair conveniently. The technical proposal of the invention is a brushless automatic control motor liquid resistance starter comprises a movable electrode plate and a static electrode plate; wherein, the movable electrode plate which is connected with a sealing star of a ring liquid resistance box cavity which is fixedly arranged in a rotating shaft is a circular plate, and a central hole is slippingly arranged on the rotating shaft; a movable contact arranged on one surface of the end of the movable electrode plate is opposite to a static contact on a cover plate of a liquid resistance box which is electrically connected with the post head on the cover plate, and a groove is arranged on the other side of the end of the movable electrode plate; wherein, the groove bottom is a slope which is deep inside and shallow outside, and a slippingly-arranged ball is arranged in the groove; the axially convex bars which are evenly distributed on the circumference of the moving are slippingly arranged in the groove of the inner wall of the liquid resistance box, and a spring is arranged between the end surface of the moving electrode plate provided with the moving contact and the liquid resistance box cover plate. The invention is mainly used for the overloading starting motors.

Description

Technical field: [0001] The invention relates to a liquid starter, in particular to a brushless automatic control motor hydraulic resistance starter. Background technique: [0002] In order to reduce the starting current of the wound three-phase asynchronous motor, and maintain a basically constant starting torque and starting power factor. For a long time, in order to solve this problem, fixed resistors or frequency-sensitive rheostats have been installed on the rotor, but these technologies have inrush current or reduce the starter torque, which cannot meet the requirements of heavy load starting. The invention patent of 03112809.2 solves the problem of brushless continuous and stable constant torque soft start of the existing winding three-phase asynchronous motor. The fixed sleeve of this patent is installed in the ring-shaped resistance liquid tank on the motor shaft, and a guide rod is set in the radial direction , the moving contact is slidingly fitted on the guide r...

AI Technical Summary

Problems solved by technology

However, since the structure of the relative movement of the moving and static contacts is arranged radially, and the two ends of the guide rod are fixedly connected with the inner and outer walls of the resistance liquid tank, when the electrodes and the resistance mechanism break down, this structure cannot be repaired and can only be repaired. The machine is scrapped, because of this deficiency, it is easy to cause users to suffer losses

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