CN1106960A

CN1106960A - Magnetohydrodynamic electric machine

Info

Publication number: CN1106960A
Application number: CN 94103170
Authority: CN
Inventors: 胡世耕; 周天宝
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-02-08
Filing date: 1994-03-23
Publication date: 1995-08-16

Abstract

The present invention belongs to electrical machines, power generator or electric motor, and especially is magnetohydrodymic electric machine comprising stator, rotor, coil and permanent magnet. It features the magnetic fluid filled into the gap between stator and rotor and the sealing part at the two ends of gap. Because the magnetic fluid has magnetic conductivity greatly higher than that of air and no effect on the relative motion of the rotor to the stator, the said electric machine is small, low in temp raise and saving in energy.

Description

Magnetohydrodynamic electric machine

The invention belongs to a kind of motor, specifically a kind of magnetohydrodynamic electric machine of doing the air gap medium with magnetic fluid.

At present when the design motor, comprise generator or motor, the magnetic flux density B δ of air gap should get high as far as possible, but the raising of B δ is limited by the saturated of used silicon steel sheet unshakable in one's determination, the B δ value (motor engineering handbook language) in 6000～9500 Gauss's scopes that silicon steel sheet adopts usually, B δ is actually the magnetic flux density of air air gap, yet the magnetic permeability of air is very low, the magnetic flux density of Here it is air air gap does not reach 6000～9500 Gausses' immediate cause, when design generator or motor, the volume of silicon steel sheet will be increased like this, the rotating speed of motor be increased, also to strengthen the exciting curent of magnetizing coil, consumption iron, consumption copper, power consumption.

The objective of the invention is to, provide the magnetic flux density height of medium in a kind of air gap, the magnetohydrodynamic electric machine energy-conservation, that volume is little.

Following mode can realize purpose of the present invention:

Comprise the magnetohydrodynamic electric machine of stator, rotor, coil and permanent magnet, it is characterized in that: inject the magnetic fluid medium in the air gap of stator and rotor, the two ends of air gap is provided with seal.

Aforesaid seal is an annular ring.

Aforesaid seal is to inject magnetic fluid in the gap of the pointed pole piece at permanent magnet two ends and rotor, and the magnetic field of permanent magnet remains in the gap magnetic fluid.

Good effect of the present invention:

The permeability of magnetic fluid is very high, does medium with magnetic fluid, and silicon steel sheet can be got near saturated flux density value, has reduced the volume of silicon steel sheet greatly, receives the effect of economize on electricity, reduction iron loss, copper loss; Adopt magnetic fluid to do self-service seal, when the axle high speed rotary,, just can bring into play high air-tightness if in some pressure differential ranges, do not leak, this is a kind of sealing of on-mechanical contact, the revolution friction loss of axle only is 1/10 of mechanical seal, the no frictionally damage of axle, the life-span of prolongation axle, both made the more coarse or axle in the surface of axle that vibration arranged slightly, also can stably work, no frictional noise, electric machine temperature rise is minimum; Can both bear pressure about seal (magnetic fluid), non-directional, the withstand voltage 10～40KPa that reaches of single-stage sealing, the multi-stage sealed 200KPa that reaches; In air gap, inject magnetic fluid its coil of electromagnetic slip clutches (on electromagnetic varispeed motor) with power excitatory power-saving 64.5%, economize on copper 74.5%, save iron and steel 72%, motor volume narrows down to the 4th support of former machine the order, the temperature rise reduction reaches 50～70 ℃, and the cost of raw material reduces by 20～25%.

Fig. 1 is the magnetohydrodynamic electric machine schematic diagram;

Fig. 2 is the self-service sealed structural representation of magnetic fluid.

The present invention will be further described in conjunction with the accompanying drawings:

Fig. 1, Fig. 2 are the embodiment that does the electromagnetic varispeed motor of medium in the air gap with magnetic fluid, 1 is stator among the figure, the 2nd, magnetizing coil, the 3rd, rotor, the 4th, magnetic fluid medium, the 5th, the sealing ring of air gap, the 6th, permanent magnet, the 7th, pole piece, the 8th, magnet fluid sealing body, magnetic fluid are that (average diameter is 10 for solid phase particle ^-6Rice) colloidal liquid that mixes with liquid phase, particulate will be done special processing before mixing, make it after mixing not because of interparticle magnetic attraction, van der waals force and condensing, do not precipitate because of gravity yet, in liquid, become stable dispersity, particle is as being inclusive in " in the lifebuoy ", magnetic fluid has hard magnetization, the flowability that general liquid is arranged again, magnetization curve does not show the magnetic hysteresis state, also be difficult for reaching magnetic saturation, high conductivity and dielectric is arranged, generally be black, select dielectric among we embodiment, basal liquid is the magnetic fluid of lubricating oil, and such magnetic fluid is injected the air gap of motor, and seals with O-ring seal 5, magnetic fluid medium 4 is when machine operation, because its hard magnetization can distribute according to the magnetic line of force, and intensive the strongest in magnetic field, the place of magnetic resistance minimum, promptly remain in the air gap, and when motor is not worked, though there is not the action of a magnetic field, because sealing ring 5 is arranged, magnetic fluid medium 4 can not overflow from air gap, and when motor is worked once more, under the effect of centrifugal force and magnetic force, be full of motor gas-gap again.Can also adopt the magnet fluid sealing body to seal magnetic fluid medium 4 in the air gap as seal, this is called the self-service sealing of magnetic current, can do like this on its structure, with the motor is example, in the gap of the pointed pole piece 7 at permanent magnet 6 two ends and rotor 2, inject magnet fluid sealing body 8, the magnetic field of permanent magnet 6 remains in the gap magnet fluid sealing, both made magnet fluid sealing body 8 be subjected to the time spent of doing of inside and outside differential pressure, because of magnet fluid sealing body 8 moves in non-uniform magnetic-field, produced the magnetic force (body force) of antagonism pressure reduction, thereby reach balance, stably be enclosed in the gap, play sealing function.

Also available magnetic fluid is done the air gap medium or is done self-service seal on the generator.

Claims

1, a kind of magnetohydrodynamic electric machine comprises stator, rotor, coil and permanent magnet, it is characterized in that: inject the magnetic fluid medium in the air gap of stator and rotor, the two ends of air gap is provided with seal.

2, magnetohydrodynamic electric machine as claimed in claim 1 is characterized in that: described seal is an annular ring.

3, magnetohydrodynamic electric machine as claimed in claim 1 is characterized in that: described seal is to inject the magnet fluid sealing body in the gap of the pointed pole piece at permanent magnet two ends and rotor, and the magnetic field of permanent magnet remains in the gap magnet fluid sealing body.