CN107332389B

CN107332389B - Blower motor and blower

Info

Publication number: CN107332389B
Application number: CN201710734183.3A
Authority: CN
Inventors: 倪祖根
Original assignee: Kingclean Electric Co Ltd
Current assignee: Kingclean Electric Co Ltd
Priority date: 2017-08-24
Filing date: 2017-08-24
Publication date: 2021-09-14
Anticipated expiration: 2037-08-24
Also published as: WO2019037266A1; CN107332389A

Abstract

The invention relates to the technical field of hair dryers, in particular to a hair dryer motor adopting a magnetic suspension bearing. The invention discloses a blower motor, which comprises a stator and a rotor, wherein the rotor comprises a rotor permanent magnet and a rotor shaft, at least one radial magnetic bearing and at least one axial magnetic bearing are sleeved on the rotor shaft, the rotor permanent magnet is arranged at the end part close to the rotor shaft, the radial magnetic bearing and the axial magnetic bearing are arranged at one end of the rotor shaft, which extends outwards from the rotor permanent magnet, a groove is formed in the axial magnetic bearing, a bulge accommodated in the groove is arranged on the rotor shaft, and the bulge is matched with the groove to limit the axial deviation of the rotor shaft. The hair dryer of the invention comprises the hair dryer motor. This hair-dryer motor and hair-dryer has solved current motor and has received the unable problem that improves the rotational speed of bearing restriction, and it not only operates reliably, but also has greatly prolonged life, has improved work efficiency.

Description

Blower motor and blower

Technical Field

The invention relates to the technical field of hair dryers, in particular to a hair dryer motor adopting a magnetic suspension bearing and a hair dryer with the hair dryer motor.

Background

The hair drier is mainly used for drying and shaping hair, but also can be used for local drying, heating and physical therapy in laboratories, physical therapy rooms, industrial production, art designing and the like, and is formed by combining a group of electric heating wires and a high-rotating-speed small fan. When the fan is electrified, the heating wire can generate heat, and the air blown out by the fan passes through the heating wire and is changed into hot air.

It can be classified into an ac series excitation type, an ac shaded pole type and a dc permanent magnet type according to the type of motor used. The series-excited hair drier has the advantages of large starting torque and high rotating speed, and is suitable for manufacturing high-power hair dryers; the disadvantage is that the noise is high and the commutator has a certain interference to the telecommunication equipment. The shaded pole type hair drier has the advantages of low noise, long service life and no interference to telecommunication equipment; the disadvantages are low rotation speed, poor starting performance and heavy weight.

In the prior art, in order to realize the miniaturization and the light weight of the volume, the higher rotating speed effect is simultaneously satisfied. However, such a motor generally comprises a casing, permanent magnetic steel, a carbon brush, a rotor and a rotor winding, and during operation, high-speed friction is generated between the carbon brush and a commutator while the rotor winding continuously switches current, which easily causes sparks to be generated between the carbon brush and the commutator, and if the rotating speed is too high, the carbon brush and the commutator are seriously worn, thereby affecting the service life of the product, or even being quickly burned out. If adopt conventional brushless motor as the dust catcher motor, under high rotational speed, its bearing leads to the temperature to rise because of mechanical friction to cause the bearing to damage, make overhaul and change more frequently, lead to its unable high rotational speed that can bear of current brushless motor, make the rotational speed can only accomplish about 80000RPM to the maximum.

Disclosure of Invention

The invention aims to provide a blower motor and a blower, which solve the problem that the rotating speed of the existing motor cannot be increased due to the limitation of a bearing, so that the maximum rotating speed of the motor can reach 150000RPM, the blower motor not only runs reliably, but also greatly prolongs the service life and improves the working efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme:

in one aspect, the present invention provides a blower motor, including a stator, a rotor rotatably disposed in the stator, the rotor including a rotor permanent magnet and a rotor shaft disposed along an axial direction, the rotor shaft being sleeved with at least one radial magnetic bearing for radially adjusting a position of the rotor shaft and at least one axial magnetic bearing for axially adjusting a position of the rotor shaft, wherein the rotor permanent magnet is disposed at an end portion close to the rotor shaft, the radial magnetic bearing and the axial magnetic bearing are disposed at an end of the rotor shaft extending outward from the rotor permanent magnet, the axial magnetic bearing is provided with a groove, the rotor shaft is provided with a protrusion received in the groove, and the groove and the protrusion are matched to limit an axial deviation of the rotor shaft.

The rotor shaft is further provided with an impeller, the impeller is arranged at the other end, far away from the rotor permanent magnet, of the rotor shaft, and the radial magnetic bearing and the axial magnetic bearing are located between the impeller and the rotor permanent magnet.

The number of the radial magnetic bearings is two, and the axial magnetic bearing is arranged between the two radial magnetic bearings.

The protrusion is an annular shaft shoulder or shaft sleeve, and the groove is an annular groove.

And the axial magnetic bearing is integrally provided with an axial position sensor for monitoring the position of the rotor shaft in the axial direction.

The magnetic bearing device also comprises at least one radial position sensor for monitoring the position of the rotor shaft in the radial direction, wherein one radial position sensor is arranged corresponding to one radial magnetic bearing, and the radial position sensor is connected with a motor control board.

The two radial position sensors and the two corresponding radial position sensors are respectively and symmetrically arranged on two sides of the axial magnetic bearing.

The two radial magnetic bearings are an upper radial magnetic bearing and a lower radial magnetic bearing respectively, the two radial position sensors are an upper radial position sensor and a lower radial position sensor respectively, the upper radial position sensor corresponds to the upper radial magnetic bearing, and the lower radial position sensor corresponds to the lower radial magnetic bearing.

And a fixing plate for fixing the radial position sensor is arranged on the periphery of the radial position sensor.

Wherein the blower motor is provided with a power supply for separately controlling the axial magnetic bearing and the radial magnetic bearing.

In another aspect, the present invention provides a blower having the blower motor.

The invention has the beneficial effects that:

the blower motor adopts the magnetic suspension principle, realizes the suspension of the radial direction in the air by utilizing the two radial magnetic bearings, and realizes the limitation of the axial direction by utilizing the axial magnetic bearing, thereby accurately and reliably realizing the position control of the rotor shaft, and in the rotating process of the rotor shaft, the blower motor does not contact with the radial magnetic bearing and the axial magnetic bearing to avoid abrasion, thereby being well adapted to the high rotating speed requirement of a blower, overcoming the problem that the rotating speed of the existing motor cannot be increased due to the limitation of the bearing, having reliable operation, greatly prolonging the service life and improving the working efficiency.

Drawings

Figure 1 is a schematic cross-sectional view of a blower motor of the present invention.

Figure 2 is an enlarged partial schematic view of the blower motor of figure 1 at I.

In the figure: 1-motor control board; 2-a rotor; 3-a stator; 4-an upper radial position sensor; 5-upper radial magnetic bearing; 6-axial magnetic bearing; 7-lower radial magnetic bearing; 8-lower radial position sensor; 9-an impeller; 10-rotor shaft.

Detailed Description

The traditional motor is composed of a stator and a rotor, wherein the stator and the rotor are connected through a mechanical bearing or have mechanical contact, so that mechanical friction exists in the movement process of the rotor. Mechanical friction causes component abrasion, mechanical vibration and noise are generated, heating of the component can be caused, the performance of a lubricant is poor, the air gap of the motor is seriously uneven, a winding generates heat, and temperature rise is increased, so that the efficiency of the motor is reduced, and the service life of the motor is shortened.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1, a blower motor according to an embodiment of the present invention includes a stator 3, and a rotor 2 rotatably disposed in the stator 3, where the rotor 2 includes a rotor permanent magnet and a rotor shaft 10 extending along an axial direction, the rotor permanent magnet is disposed near one end of the rotor shaft 10, at least one radial magnetic bearing for radially adjusting a position of the rotor shaft 10 and at least one axial magnetic bearing for axially adjusting a position of the rotor shaft 10 are sleeved on a portion of the rotor shaft 10 extending out of the stator 3, and the number of the radial magnetic bearings and the number of the axial magnetic bearings may be selected according to different requirements of the motor. The rotor is suspended under the action of magnetic force, so that no mechanical contact exists between the rotor and any other component, the motor has no mechanical wear, the rotor can run to the rotating speed of 150000RPM, and the motor has the advantages of no mechanical wear, low energy consumption, low noise, long service life, no lubrication, no oil pollution and the like.

Specifically, the rotor shaft 10 is further provided with an impeller 9, the impeller 9 is arranged on the other end of the rotor shaft 10 far away from the rotor permanent magnet, and the radial magnetic bearing and the axial magnetic bearing are located between the impeller 9 and the rotor permanent magnet. The axial magnetic bearing is integrally provided with an axial position sensor for monitoring the position of the rotor shaft in the axial direction. In the present embodiment, there are two radial magnetic bearings, and the axial magnetic bearing 6 is disposed between the two radial magnetic bearings.

Preferably, the axial magnetic bearing 6 is provided with a groove, the rotor shaft 10 is provided with a protrusion accommodated in the groove, and the groove and the protrusion are matched to limit the axial deviation of the rotor shaft 10. In this embodiment, the protrusion is an annular shoulder or sleeve, and the recess is an annular groove. At the same time, the grooves can also limit the movement of the rotor shaft in the radial direction to a certain extent.

The blower further comprises at least one radial position sensor for monitoring the position of the rotor shaft 10 in the radial direction, and a fixing plate for fixing the radial position sensor is arranged on the periphery of the radial position sensor. One radial position sensor is arranged corresponding to one radial magnetic bearing and is connected with the motor control board 1. Specifically, the number of the radial position sensors is two, the two radial magnetic bearings are an upper radial magnetic bearing 5 and a lower radial magnetic bearing 7, the two radial position sensors are an upper radial position sensor 4 and a lower radial position sensor 8, the upper radial position sensor 4 corresponds to the upper radial magnetic bearing 5, and the lower radial position sensor 8 corresponds to the lower radial magnetic bearing 7. The two radial magnetic bearings and the two corresponding radial position sensors are respectively and symmetrically arranged at two sides of the axial magnetic bearing.

The magnetic suspension bearing of the blower motor is controlled by matching the motor control board, when the motor is started, the position of a rotor shaft is detected by an axial position sensor arranged in a radial position sensor and an axial magnetic bearing, a deviation signal of a rotating shaft is transmitted to a controller of the motor control board, the controller performs proper operation on the position deviation signals detected by the radial position sensor and the axial position sensor, the operated control signals are converted into control current through a motor power amplifier, the control current generates magnetic force in the magnetic suspension bearing, and the rotor shaft is driven to correct the position, so that the rotor shaft can quickly return to a reference position, and the motor starts to operate after the rotor shaft is finally determined to reach required positions in the axial direction and the radial direction respectively.

When this hair-dryer motor stall, the rotor still can keep rotatory certain time owing to rotatory inertia after the outage, if the magnetic suspension bearing outage this moment, the rotor loses balance, can lead to the motor to damage, so, the motor need set up to be after the complete stall of rotor, the power of disconnection magnetic suspension bearing coil on the magnetic suspension bearing again, preferred embodiment, the motor sets up a charging source in order to supply power for the coil of magnetic suspension bearing, avoids the motor outage back rotor to lose balance to damage the motor, this charging source lasts to charge when the motor starts.

When the blower motor is used, the electromagnetic parameters can be adjusted through the controller, so that the rotor has enough magnetic tension in the axial direction and the radial direction, the position of the rotor cannot be changed due to the change of load, and the normal operation of the motor is ensured.

Preferably, in this embodiment, both the radial magnetic bearing and the axial magnetic bearing are made of metal materials, and preferably, high-performance metal materials can be used to reduce the volume of the bearing, reduce noise and improve the efficiency of the motor; meanwhile, the air duct is designed as a cooling air duct, and the bearing is cooled when the impeller 12 rotates, so that the service life of the bearing is prolonged.

In this embodiment, the radial position sensor is fixed to a dedicated fixing plate, and a high-precision positioning structure is provided on the fixing plate, so that the radial position sensor detects a small positional deviation of the rotor with high precision.

The blower motor is a brand new blower motor structure and is applied to a blower, so that the blower has the advantages of high rotating speed, low noise and long service life, and the air output of the blower is greatly improved.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.

Claims

1. A blower motor comprises a stator (3) and a rotor (2) rotationally arranged in the stator (3), and is characterized in that the rotor (2) comprises a rotor permanent magnet and a rotor shaft (10) arranged along the axial direction, at least one radial magnetic bearing for radially adjusting the position of the rotor shaft (10) and at least one axial magnetic bearing (6) for axially adjusting the position of the rotor shaft (10) are sleeved on the rotor shaft (10), wherein the rotor permanent magnet is arranged at the end part close to the rotor shaft (10), the radial magnetic bearing and the axial magnetic bearing (6) are arranged at one end of the rotor shaft (10) extending outwards from the rotor permanent magnet, a groove is arranged on the axial magnetic bearing (6), a bulge accommodated in the groove is arranged on the rotor shaft (10) and is matched with the bulge through the groove, so as to limit the deviation of the rotor shaft (10) along the axial direction, an impeller (9) is also installed on the rotor shaft (10), the impeller (9) is arranged at the other end far away from the rotor permanent magnet on the rotor shaft (10), and the radial magnetic bearing and the axial magnetic bearing are positioned between the impeller (9) and the rotor permanent magnet;

the blower motor is provided with a power supply for independently controlling the axial magnetic bearing and the radial magnetic bearing so as to supply power to coils of the axial magnetic bearing and the radial magnetic bearing and continuously supply power after the motor is powered off;

the two radial magnetic bearings are an upper radial magnetic bearing (5) and a lower radial magnetic bearing (7), and the axial magnetic bearing (6) is arranged between the upper radial magnetic bearing (5) and the lower radial magnetic bearing (7);

and when the impeller (9) rotates, the axial magnetic bearing and the radial magnetic bearing are cooled through a cooling air duct.

2. The blower motor of claim 1, wherein the projection is an annular shoulder or boss and the recess is an annular groove.

3. Blower motor according to claim 1 or 2, characterised in that the axial magnetic bearing is provided integrally with an axial position sensor for monitoring the position of the rotor shaft in the axial direction.

4. The blower motor of claim 1, further comprising at least one radial position sensor for monitoring the position of the rotor shaft (10) in the radial direction, the radial position sensor being connected to the motor control board (1);

the number of the radial position sensors is two, the two radial position sensors are an upper radial position sensor (4) and a lower radial position sensor (8), the upper radial position sensor (4) corresponds to the upper radial magnetic bearing (5), and the lower radial position sensor (8) corresponds to the lower radial magnetic bearing (7);

the upper radial position sensor (4) and the lower radial position sensor (8) are symmetrically arranged on two sides of the axial magnetic bearing (6).

5. The blower motor of claim 4, wherein the radial position sensor is provided at its outer periphery with a fixing plate for fixing the radial position sensor.

6. A hair dryer having a hair dryer motor as claimed in any one of claims 1 to 5.