Direct current motor

Abstract

The DC motor includes the front end cover, the rotating shaft, the chassis, the rotor, the rear end cover, the carbon brush box and the back cover shell. The magnet steels are the stator are adhibited on the internal walls of the front end cover and the rear end cover. The splitting structure with the dovetail slot in the middle is adopted in the rotating shaft. The rotor composed of N pieces of lambdoidal sheet copper and a batch of the silicon steel plate is embedded in the dovetail slot. There is the groove on two sides of the outer end of each sheet copper. The slice of short-circuit with clips on two ends locks each sheet copper. The fan blade is installed in the back cover shell. The DC motor possesses the advantages of large power, lightweight, small volume, high efficiency and long service life.

Description

Technical field [0001] The invention relates to a motor, especially a rare-earth disk type DC motor. Background technique [0002] Chinese patent CN1052584C announced a special DC motor. This special DC motor is mainly composed of a casing, a front end cover, a shaft roller, and a rear end cover. The inner walls of the front end cover and the rear end cover are all pasted with magnetic steel. It has a wedge-shaped groove and is inlaid with a number of copper sheets of N. A stack of silicon steel sheets is installed between the above-mentioned copper sheets. The inner hole is equipped with a commutation seat, a brush and two terminal blocks. This kind of motor, first of all, the two terminal blocks are very easy to heat, because the contact surface is too small, and the copper sleeve used is installed on the M8 bolt, when the contact resistance is large, the bolt will be blown, and the speed is very high, 24 volts It is 2291r.p.m. If you use 72 volts, the speed is at least ...

AI Technical Summary

Problems solved by technology

This kind of motor, first of all, the two terminal blocks are very easy to heat, because the contact surface is too small, and the copper sleeve used is installed on the M8 bolt, when the contact resistance is large, the bolt will be blown, and the speed is very high, 24 volts It is 2291r.p.m. If you use 72 volts, the speed is at least 7000r.p.m., a little unbalanced, it will cause vibration and noise, and it will also bring difficulties to the manufacture of the reducer; when the load is too large or the start-up time is slightly For a long time (this is the case when the battery car climbs a slope), at this time, when the current flows through the rotor, the temperature will be too high, which will cause the solder on the breaker ring to melt, and cause the U-shaped breaker ring to fall off, causing the motor to break and fail to work. or burn out; and the brush and the brush braid are riveted by rivets, the contact resistance is very large, which makes the temperature rise of the brush very high, and the riveting is not reliable, and the riveting points are easy to loosen during friction, thereby further increasing the contact resistance Large, the large current flowing at this time causes the brush to loosen and generate an arc at the riveted joint to burn the brush

Embodiment 2 disclosed in this patent is a wrong scheme and cannot be realized

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