CN2275299Y

CN2275299Y - Micro permanent DC double side bearing motor

Info

Publication number: CN2275299Y
Application number: CN 96219000
Authority: CN
Inventors: 马岩
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-09-17
Filing date: 1996-09-17
Publication date: 1998-02-25
Anticipated expiration: 2006-09-17

Abstract

The utility model relates to a miniature permanent magnetism direct current double face bearing motor, which can be used for miniature equipment or toys or electric miniature cars. The both ends of an electric machine rotor are respectively provided with a miniature bearing; three groups of bare windings whose length and number of turns are same and brush contacts are wound on a rotor core. A permanent magnetism stator is composed of a positive rare earth permanent magnet and a negative rare earth permanent magnet whose sizes are same. When adopted, the utility model can overcome the shortcomings of the existing motor with dead starting point, unstable rotation speed, poor durability, big resistance, etc. The utility model can enhance the sensitivity of the motor, having the advantages of heat radiation performance and durability.

Description

The two-sided bearing electric motor of miniature DC

The utility model relates to a kind of direct current machine, mainly is a kind of DC micromotor.

There are a lot of shortcomings in the at present general magneto that uses, as starting the dead point, and rotary speed unstabilization, poor durability, phenomenon such as resistance is big, so motor cisco unity malfunction, the line bag that also can burn out motor sometimes causes certain loss.The main cause that motor damages is because the rotor rotational resistance is big, rotary speed unstabilization and the body heat dispersion is relatively poor causes.

The purpose of this utility model is just for fear of the deficiency of above-mentioned prior art and a kind of permanent magnet direct current motor that designs, and this scheme does not have the startup dead point, and the rotor resistance is little, and working stability is reliable, the rotating speed height.

The purpose of this utility model is realized by following concrete measure: the miniature magnetic DC motor that is made of center rotor, permanent-magnet stator, brush and shell, miniature bearing is equipped with at the two ends of rotor shaft, it is identical to be wound with three group length on the rotor core, the bare wire circle that the number of turns equates, and brush contact is housed.Permanent-magnet stator is identical by two block sizes, and the rare-earth permanent magnet of radial magnetizing constitutes.The overall diameter of miniature bearing is 6mm, and thickness is 2mm.

Below in conjunction with accompanying drawing the utility model is elaborated:

Fig. 1 is a center rotor

Fig. 2 is a casing

Fig. 3 is a bonnet

Fig. 4 is a brush

Fig. 5 is a permanent-magnet stator

Miniature bearing 2 and 7 are equipped with in rotating shaft 1 two ends of center rotor, can reduce the resistance of start of motor like this.The external diameter of bearing is 6mm, and thickness is 2mm.It is identical to be wound with three group length on the rotor core, the bare wire circle 4 that the number of turns equates, and brush contact is housed.Permanent-magnet stator is identical by two block sizes, and the positive and negative rare-earth permanent magnet 11,12 of radial magnetizing constitutes.Center rotor is packed in the groove of permanent-magnet stator, and center rotor, permanent-magnet stator, brush 10 are all packed in the heat-dissipating casing 8 that alumel makes like this, with bonnet 9 sealings.Because design makes the side surface of iron core increase covering like this, unit interval flux change amount increases when making the rotor running, has reduced the startup operating current of motor.

Operation principle of the present utility model is after the DC power supply of 3V is opened, and this motor can start, and reaches the rotation of high-speed smooth very soon.Just the 3V direct current is connected, and rotor produces bigger magnetic force and permanent-magnet stator interacts, and rotor is rotated rapidly.Miniature bearing is equipped with at the rotating shaft two ends, and can to make the fast reason of rotor startup be because other miniature motor rotor axle two ends free from ball bearing, and frictional force is big.

Adopt the utility model can overcome in the existing motor and start the dead point, rotary speed unstabilization, poor durability, resistance is big Etc. shortcoming, improved simultaneously the sensitiveness of motor, good thermal diffusivity has strengthened durability. But extensive use In tiny device such as toy, electric motor car etc.

Claims

1. two-sided bearing electric motor of miniature DC, center rotor is arranged in the groove of permanent-magnet stator, and is cased with brush, by the bonnet sealing, it is characterized in that:

A) miniature bearing 2 and 7 are equipped with in the rotating shaft two ends of center rotor, and it is identical to be wound with three group length on the iron core of rotor, the bare wire circle 4 that the number of turns equates, and brush contact 6 is housed;

B) permanent-magnet stator rare-earth permanent magnet 11,12 identical by two block sizes, radial magnetizing constitutes.

2. motor as claimed in claim 1, the overall diameter that it is characterized in that miniature bearing is 6mm, thickness is 2mm.