A built-in outer rotor permanent magnet motor direct drive mine hoist

Abstract

Disclosed is a built-in outer rotor permanent-magnet motor direct-drive mine hoist. A stator of a permanent-magnet motor is sleeved onto a spindle of the hoist through a stator support structure, a rotor support structure and an inner bearing are sleeved on the spindle of the hoist along two sides of the stator of the permanent-magnet motor, an outer rotor of the permanent-magnet motor is installed on the upper portion of the rotor support structure, an outer bearing and a reel support structure are sleeved on two sides of the spindle of the hoist, a steel wire reel is installed on the upper portion of the reel support structure and outside the outer rotor of the permanent-magnet motor, the outer rotor of the permanent-magnet motor is connected to the inner side of the steel wire reel through a flexible connecting mechanism, and a left support base and a right support base are installed at two ends of the spindle of the hoist. The advantages of compact structure and uniform stress of the built-in hoist are sufficiently used, the outer rotor permanent-magnet motor is simple in structure, excellent in control characteristics, efficient and reliable, system installation and connection of the rotor and the reel of the hoist are facilitated by the outer rotor structure of the motor.

Description

technical field [0001] The invention relates to the field of mining machinery, in particular to a direct drive system of a large mine hoist. Background technique [0002] The mine hoist is an important delivery tool in the process of coal mining. It usually plays the role of transporting coal and other resources at the bottom of the mine to the ground. The reliability and stability of its operation directly affects the smooth progress of mine operations, and its lifting capacity also directly determines mine production. The traditional mine hoist system mainly includes connecting equipment such as drive motor, reducer and coupling, wire rope reel, control equipment, etc. Located at the wellhead or underground. After decades of development, the drive system and automation control of mine hoists have been continuously improved. From the winding type to the multi-rope friction type, from the variable speed drive through the reducer to the direct-coupled structure, and then t...

AI Technical Summary

Problems solved by technology

However, under the action of various forces inside the motor, it is difficult to ensure the uniformity of the air gap

Once the air gap is eccentric due to factors such as unilateral magnetic pull, it will seriously affect the performance of the motor and pose a threat to the safe operation of the system

Therefore, in order to ensure the safety of the system, the hoist of the two-bearing shaft system should have sufficient rigidity. Causes additional forces acting on the foundation, inaccuracies in ground assembly, etc.

The advantages of the generator set-DC motor drive system are: strong overload capacity, all required equipment are conventional products, easy supply, reliable operation, low technical requirements, and will not cause harmful effects on the power grid outside the system; The disadvantages are: low efficiency, only about 75% on average; the range of speed regulation cannot be too large due to the influence of residual magnetism; the equipment is complex, huge, and occupies a large area, etc.

[0024] (1) Since the rotor excitation still depends on the DC power supply, there is inevitably a slip ring and brush structure, which increases the complexity of the system structure

[0025] (2) Most industrial power grids provide AC power. In order to realize DC excitation, a separate rectifier device is required to provide DC power for excitation, which increases the complexity of the control system

[0026] (3) Due to the friction of the slip ring and the brush, the mechanical loss is increased; due to the existence of the DC excitation system, the electrical loss is increased, which reduces the overall efficiency of the system and increases the failure points and maintenance workload

[0027] (4) The magnetic poles of the rotor of the electric excitation motor and the inner side of the reel are hard-connected with a T-shaped mechanical structure. When the reel needs to be swung during field installation or the reel is deformed under the action of the wire rope, the air gap of the motor will be affected. And then threaten the safe and stable operation of the motor

This structure makes full use of the low-speed direct drive characteristics and high-efficiency operation characteristics of the permanent magnet motor, and at the same time avoids the static instability problem of the multi-support bearing system, but it still cannot avoid the uneven force of the suspended rotor structure and the difficult control of the motor air gap problem

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