110V 120V 240V Single Capacitor 1 HP 0.75kw 1 Phase AC Electric Motor
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Product Description
| Model |
HP |
KW |
Currnet |
Speed |
Eff |
Power Factor |
Tn |
Tmax/In |
Tst/Tn |
| ML-802-4 |
1 |
0.75 |
4.75A |
1410 |
73% |
0.94 |
5.08 |
1.7 |
2.5 |
Company Profile
FAQ
Why should grooves be opened on the collector rings of large motors?
The slip ring is a key component of the wound rotor motor. Today, we will use the slip ring of the three-phase wound rotor motor as the material to explain.
The collector ring of the motor consists of three copper or steel rings insulated from each other, and the rings are separated by an insulator; the surface of the collector ring of a small-sized motor is a complete cylindrical surface, while the collector ring of a large motor , it is necessary to machine a spiral groove on the ring surface, the purpose is to collect the carbon powder generated by the friction between the carbon brush and the collector ring during the operation of the motor. Because the groove on the surface is spiral, it can ensure the carbon brush during the operation of the motor. The surface force and contact are uniform to ensure the reliability of the motor operation.
In the actual production and processing process, in order to ensure the coaxiality of the collector ring and the rotor, many motor manufacturers process the surface of the collector ring in the rotor surface turning process, and ensure that the surface roughness of the collector ring meets the requirements; The slip ring of the groove is directly installed and used by most motor manufacturers, so the machining accuracy of the slip ring itself, as well as the dimensional conformity of the slip ring hole and the coaxiality conformity of the inner hole and the ring surface are particularly important. Motor manufacturers and collector ring manufacturers must pay attention to the problem.
Brief introduction of slip ring application
Slip ring series synchronous motors, asynchronous motors and other motors using slip rings are widely used in industrial sectors, and most of them operate under various harsh conditions. Although these motors do not have the same commutation effect as DC motors, but like commutators, they also suffer from abnormal wear of collector rings or brushes, brush vibrations, and sparks.
Especially in terms of brush material, not only graphite brushes are used for collector ring brushes, but also metal graphite brushes are sometimes used in order to increase the current density of the brushes. Therefore, factors such as abnormal residual expansion must also be considered. Even for high-speed motors such as turbo-generators or motors operating in fully enclosed gaseous and hydrogen media, there are many problems.
The material of the collector ring requires high mechanical strength, good conductor of electricity, and corrosion resistance. When sliding in contact with the brush, it must have wear resistance and stable sliding contact characteristics. In general, steel collector rings have good wear resistance and high mechanical strength, so they are mostly used in synchronous motors with a large difference in collector ring wear caused by polarity.
In general, steel collector rings have good wear resistance and high mechanical strength, so they are mostly used in synchronous motors with a large difference in collector ring wear caused by polarity. Steel can be machined into complex structures, and it is a readily available and inexpensive material, and is therefore widely used in synchronous motors including hydroelectric generators with low peripheral speeds.
For the slip ring, which mainly emphasizes mechanical strength and wear resistance at high peripheral speeds, like the turbogenerator, forged steel is sometimes used. In addition, when corrosion resistance is required, stainless steel can be used, but the sliding characteristics of stainless steel are unstable, and the improper combination with the brush will cause the brush to jump, which is likely to cause excessive temperature rise or abnormal wear of the brush, so it must be doubled when used. Notice. Compared with steel collector rings, copper collector rings such as bronze castings have better sliding properties, so they are widely used. The collector rings are worn or the brushes are worn abnormally.
In the cooperation between the collector ring and the brush, when the abrasiveness of the brush is too strong and the material of the collector ring is too soft, step wear equivalent to the width of the brush often occurs on the collector ring. Especially for fully enclosed motors with high temperature and low humidity, it is more likely to cause excessive wear of brushes or collector rings. The ghost scars are formed in this way. There are only very small scars at the beginning, and the brushes have poor current collection in these parts and sparks are generated. Once a spark is generated, the scar will gradually deteriorate and expand, and finally a scar with the same size as the sliding contact surface of the brush is formed. Therefore, even if the brushes for the slip rings generate very small sparks, care must be taken.
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