CN1707127A - A low power consumption permanent magnet bias hybrid radial magnetic bearing - Google Patents

Abstract

The permanent magnetic offset mixed radial magnetic bearing with low power consumption features that it consists of stator and rotor with air gap in between. The stator includes 8 stator magnetic poles and they forms 4 pairs in both right and left ends and separately for positive and negative directions in X and Y directions. Each stator magnetic pole consists of stator magnetic pole core and stator winding on the core, and 4 stator core yokes are connected across between two stator cores each to constitute the 8 stator magnetic poles, with magnetic isolators being set between the stator core yoke for X direction and that for Y direction. The rotor includes rotation shaft, permanent magnet, magnetizing sleeve and rotor core. The present invention has separated permanent magnetic path and electromagnetic part, lowered control current and control power consumption, small volume and light weight.

Description

A low power consumption permanent magnet bias hybrid radial magnetic bearing

Technical field

The invention relates to a non-contact magnetic suspension bearing, in particular to a low-power permanent magnet bias hybrid radial magnetic bearing, which can be used as a non-contact support for rotating parts in mechanical equipment such as motors and machine tools.

Background technique

The key to low power consumption of the permanent magnet electromagnetic hybrid magnetic bearing is to ensure that the magnetic flux generated by the electromagnetic coil does not pass through the permanent magnet, but the existing permanent magnet bias hybrid magnetic bearing structure is based on the ordinary radial electromagnetic bearing, along the A permanent magnet is placed axially in the stator, and the magnetic flux generated by the control coil must pass through the permanent magnet. Due to the large reluctance of the permanent magnet, a large excitation current is required for the control coil to generate a certain electromagnetic flux density. Therefore, the existing permanent magnet Biased hybrid magnetic bearings consume a lot of power, are bulky and heavy.

Contents of the invention

The technical problem of the present invention is to overcome the deficiencies of the prior art and provide a low power consumption permanent magnet bias hybrid radial magnetic bearing with low power consumption, small size and light weight.

The technical solution of the present invention is: low power consumption permanent magnet bias hybrid radial magnetic bearing, characterized in that: it is composed of a stator and a rotor, and there is an air gap between the stator and the rotor. The stator has 8 stator poles in total. They form 4 pairs of magnetic poles at the left and right ends, which respectively form the magnetic poles in the positive and negative directions of the X and Y axes. Each stator pole is composed of a stator pole core and a stator coil wound on it, and the 4 stator core yokes are respectively connected to the two ends. The stator poles of the ±X axis and ±Y axis are formed, and the stator poles in the X-axis direction and the Y-axis direction are separated by stator poles; the rotor includes a rotating shaft, a permanent magnet, a magnetic sleeve, a rotor core, and There are two magnetically conductive magnetic sleeves and permanent magnets on the outside, the two magnetic sleeves sandwich the permanent magnets, and the rotor core is on the outside of the two magnetic sleeves.

The principle of the present invention is: in the present invention, the permanent magnet is placed in the rotor, and the electromagnetic coil is placed in the stator core. The rotor core and the magnetic sleeve return to the permanent magnet to form the main magnetic circuit of the magnetic suspension bearing. The magnetic flux path generated by the electromagnetic coil is: taking the magnetic flux generated by the electromagnetic coil current in the positive direction of the Y axis at a certain end as an example, it passes through the stator core yoke in the positive direction of Y, the air gap, a pole in the positive direction of Y in the rotor core, and the rotor core The other three poles to the other three poles of the rotor core at the other end, one pole in the positive direction of Y in the rotor core, the air gap, the stator pole core in the positive direction of Y, and the stator axial guide magnet core yoke form the adjustment magnetic field of the magnetic suspension bearing. The circuit separates the permanent magnet circuit from the electromagnetic circuit.

Compared with the prior art, the present invention has the advantages that: because the present invention adopts the permanent magnet magnetic field as the bias magnetic field, compared with the traditional electromagnetic bearing, the excitation current which accounts for the main component in the coil current is eliminated, and the copper loss of the winding and the control Power amplifier losses, so power consumption is very low. At the same time, compared with the traditional electromagnetic bearing, the electromagnetic field produced by the permanent magnet electromagnetic hybrid magnetic bearing only changes in size and has no polarity change, which makes the hybrid magnetic bearing have very low iron loss, which further reduces the power consumption. consumption. Compared with the existing permanent magnet bias hybrid magnetic bearing, the permanent magnet magnetic circuit of the low power consumption permanent magnet bias hybrid radial magnetic bearing of the present invention is separated from the electromagnetic magnetic circuit, because the reluctance of the electric excitation magnetic circuit is very small. Low, small excitation current can generate large magnetic flux, thus saving power consumption.

Description of drawings

Fig. 1 is an axial sectional view of the present invention;

Fig. 2 is an end view of the present invention.

Detailed ways

As shown in Fig. 1 and Fig. 2, the present invention generally consists of two sets of stators and rotors on the left and right sides. There is an air gap 6 between the stators and the rotors. Each stator core yoke 7 spans the left and right ends and forms a magnetic pole at each end. , 4 stator core yokes 7 are placed orthogonally, and are respectively connected in two sections to form 4 magnetic poles of ±X axis and ±Y axis. Such a magnetic bearing has 8 magnetic poles in total, and the left and right groups are respectively 4 magnetic poles. Between the stator core yoke 7 in the X-axis direction and the Y-axis direction is the stator pole spacing magnet 9, and the stator coil 8 is wound on the stator core yoke 7; the rotor includes a rotating shaft 1, a permanent magnet 3, a magnetic sleeve 4, and a rotor core 5. On the outside of the rotating shaft 1 are two magnetically conductive magnetic sleeves 4 and permanent magnets 3. The two magnetically conductive sleeves 4 sandwich the permanent magnet 3. On the outside of the two magnetically conductive sleeves 4 is the rotor core. 5. When the rotating shaft 1 is made of magnetically permeable material, a non-magnetically permeable sleeve 2 will be added outside it. The permanent magnet 3 is an integral ring, which is magnetized in the axial direction; the material of the permanent magnet 3 is a rare earth permanent magnet or a ferrite permanent magnet. The stator pole spacer magnet 9 is air or a non-magnetic material, such as stainless steel, copper, aluminum, titanium alloy, plastic bakelite, air and the like. The nonmagnetic sleeve 2 is made of nonmagnetic materials such as stainless steel, copper, aluminum, titanium alloy, plastic bakelite, and the like.

Claims (4)

1. The low power consumption permanent magnet bias hybrid radial magnetic bearing is characterized in that: it consists of a stator and a rotor, and there is an air gap (6) between the stator and the rotor. The stator has 8 stator poles in total, and they consist of 4 For the magnetic poles, the magnetic poles in the positive and negative directions of the X and Y axes are respectively formed. Each stator magnetic pole is composed of a stator core yoke (7) and a stator coil (8) wound on it. Each stator core yoke 7 spans the left and right sides. end, and form a magnetic pole at each end, four stator core yokes 7 are placed orthogonally, respectively connect the left and right ends to form ±X-axis and ±Y-axis magnetic poles, and the stator pole cores (7) are stator pole interval magnets (9 ); the rotor includes a rotating shaft (1), a permanent magnet (3), a magnetically conducting sleeve (4), a rotor core (5), and the outside of the rotating shaft (1) is two magnetically conducting magnetically conducting sleeves (4 ) and a permanent magnet (3), two magnetic conducting sleeves (4) clamp the permanent magnet (3) in the middle, and the rotor core (5) is outside the two magnetic conducting sleeves (4). 2. The low power consumption permanent magnet bias hybrid radial magnetic bearing according to claim 1, characterized in that: said permanent magnet (3) is an integral ring, which is magnetized along the axial direction. 3. The low power consumption permanent magnet bias hybrid radial magnetic bearing according to claim 1, characterized in that: the stator pole spacing magnet (9) is made of stainless steel, copper, aluminum, titanium alloy, plastic bakelite, air and other non-magnetic materials. 4. The low power consumption permanent magnet bias hybrid radial magnetic bearing according to claim 1, characterized in that: said permanent magnets are rare earth permanent magnets or ferrite permanent magnets.

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