WO2019037524A1

WO2019037524A1 - Vacuum cleaner motor and vacuum cleaner

Info

Publication number: WO2019037524A1
Application number: PCT/CN2018/091616
Authority: WO
Inventors: 倪祖根
Original assignee: 莱克电气股份有限公司
Priority date: 2017-08-24
Filing date: 2018-06-15
Publication date: 2019-02-28
Also published as: CN107370321A; CN107370321B

Abstract

The present invention relates to the technical field of vacuum cleaners, and provides a high-speed brushless vacuum cleaner motor using a magnetic bearing and a vacuum cleaner. The vacuum cleaner motor comprises a stator (5) and a rotor (6). The vacuum cleaner motor is provided with the magnetic bearing capable of suspending the rotor (6) in the stator (5). The rotor (6) comprises a rotor shaft (11), the magnetic bearing comprises a lower axial magnetic bearing (9) provided at one end of the rotor shaft (11) for axially adjusting the position of the rotor shaft (11), and the other end of the rotor shaft (11) is provided with an axial fixing plate (2) for axially adjusting the position of the rotor shaft (11). The vacuum cleaner is provided with the vacuum cleaner motor. The vacuum cleaner motor comprises a controller. The controller actively adjusts the speed of the rotor of the vacuum cleaner motor according to the load size in the vacuum cleaner. The vacuum cleaner motor and the vacuum cleaner can overcome the problem that the existing motor is limited by the bearing and the rotation speed cannot be improved, and therefore, the operation is reliable, the service life is greatly prolonged, and the working efficiency is improved.

Description

Vacuum cleaner motor and vacuum cleaner

Technical field

The invention relates to the technical field of vacuum cleaners, in particular to a high speed brushless vacuum cleaner motor and a vacuum cleaner using a magnetic suspension bearing.

Background technique

Vacuum cleaner motors are required to have a small volume and a high speed. At present, most of the major vacuum cleaner products at home and abroad use series-excited motors or brushed DC motors. In order to achieve miniaturization and weight reduction of volume, and to meet greater suction effects, it is often necessary to increase the rotational speed. However, such motors are generally composed of a casing, a permanent magnet, a carbon brush, a rotor, and a rotor winding. During operation, high-speed friction occurs between the carbon brush and the commutator, and the rotor winding continuously switches current. This causes a spark between the carbon brush and the commutator. If the speed is too high, it will cause serious wear between the carbon brush and the commutator, which will affect the life of the product and even burn out quickly. If a conventional brushless motor is used as the vacuum cleaner motor, at high speeds, the bearing loses energy due to mechanical friction and the temperature rises, resulting in bearing damage, making maintenance and replacement more frequent, resulting in the existing brushless motor being unable to withstand. Excessive speed, so that the maximum speed can only be about 80000RPM, can not achieve high performance of ultra-high speed 150,000RPM.

Summary of the invention

The object of the present invention is to provide a vacuum cleaner motor and a vacuum cleaner, which can overcome the problem that the existing motor can not be increased in speed by bearing limitation, and the operation is reliable, the service life is greatly prolonged, and the working efficiency is improved.

To this end, the present invention employs the following technical solutions:

In one aspect, the present invention provides a vacuum cleaner motor including a stator and a rotor, the vacuum cleaner motor being provided with a magnetic suspension bearing that suspends the rotor in the stator, the rotor including a rotor shaft, the magnetic suspension bearing including at least one a lower axial magnetic bearing disposed at one end of the rotor shaft for axially adjusting the position of the rotor shaft, the other end end of the rotor shaft being provided with an axial fixing for axially adjusting the position of the rotor shaft board.

As a preferred mode of the above vacuum cleaner motor, the axial driving force generated by the lower axial magnetic bearing drives the rotor shaft against the axial fixing plate.

As a preferred mode of the vacuum cleaner motor, the lower axial magnetic bearing is mounted with an end of the impeller adjacent to the rotor shaft, and the axial fixed plate is located at an end of the end of the rotor shaft where the impeller is not mounted.

As a preferred mode of the vacuum cleaner motor, an end portion of the rotor shaft corresponding to the axial fixing plate has an arc-shaped curved surface, and the curved curved surface is a hemispherical curved surface or an elliptical curved surface.

As a preferred mode of the vacuum cleaner motor, the rotor further includes a permanent magnet fixed to the rotor shaft, and the magnetic suspension bearing further includes a plurality of rotor shafts disposed on opposite sides of the permanent magnet for radially adjusting the rotor shaft The position of the radial magnetic bearing.

As a preferred mode of the above vacuum cleaner motor, the two radial magnetic bearings are respectively symmetrically disposed centering on the permanent magnets of the rotor.

As a preferred mode of the above vacuum cleaner motor, the lower axial magnetic bearing and the axial fixed plate are respectively disposed outside the two radial magnetic bearings.

As a preferred mode of the vacuum cleaner motor, there are further provided two radial position sensors for monitoring the position of the rotor shaft in a radial direction, and one of the radial position sensors corresponds to one of the radial magnetic bearing arrangements. The radial position sensor is coupled to the motor control board.

As a preferred mode of the above vacuum cleaner motor, two of the radial position sensors are disposed between the two radial magnetic bearings and are located on both sides of the permanent magnet.

As a preferred mode of the vacuum cleaner motor, the two radial magnetic bearings are respectively an upper radial magnetic bearing and a lower radial magnetic bearing disposed on two sides of the permanent magnet, and the two radial position sensors The upper radial position sensor and the lower radial position sensor, respectively, the upper radial position sensor corresponding to the upper radial magnetic bearing, and the lower radial position sensor corresponding to the lower radial magnetic bearing.

As a preferred mode of the above vacuum cleaner motor, the axial fixing plate is connected to the motor control board and integrated with the motor control board.

As a preferred mode of the above vacuum cleaner motor, the cleaner motor is provided with a separate power source for controlling the magnetic suspension bearing.

In another aspect, the present invention also provides a vacuum cleaner having the vacuum cleaner motor, the vacuum cleaner motor including a controller that actively adjusts a speed of a rotor of the cleaner motor in accordance with a load within the cleaner.

The beneficial effects of the invention are:

The vacuum cleaner motor of the present invention is proposed for the problem that the motor for the vacuum cleaner in the prior art cannot increase the rotational speed due to the limitation of the bearing, and the conventional mechanical contact structure is changed into non-mechanical contact by using the principle of magnetic levitation. The two radial magnetic bearings realize the positional adjustment in the radial direction, and the axial direction limitation is realized by the axial magnetic bearing and the axial fixed plate, so that the position control of the rotor shaft can be accurately and reliably realized, and the rotor shaft is rotated. In the middle, it does not contact with the radial magnetic bearing and the axial magnetic bearing to avoid wear, so that it can be well adapted to the high speed demand of the vacuum cleaner, and can overcome the problem that the existing motor can not be increased by the bearing limitation, and the operation is reliable. The earth extends its service life and increases work efficiency.

DRAWINGS

1 is a schematic cross-sectional structural view of a vacuum cleaner motor of the present invention;

Figure 2 is a partially enlarged schematic view of the vacuum cleaner motor of Figure 1 at 1.

In the figure: 1-motor control board; 2-axial fixed plate; 3-upper radial magnetic bearing; 4-upper radial position sensor; 5--stator; 6-rotor; 7-lower radial position sensor; Lower radial magnetic bearing; 9-lower axial magnetic bearing; 10-impeller; 11-rotor shaft.

Detailed ways

The conventional motor is composed of a stator and a rotor. The stator and the rotor are coupled by mechanical bearings or have mechanical contact, so there is mechanical friction during the movement of the rotor. Mechanical friction does not cause parts to wear, causing mechanical vibration and noise, and it will cause heat generation of the parts, which will deteriorate the performance of the lubricant. Seriously, the air gap of the motor will be uneven, the winding will heat up, and the temperature rise will increase, thus reducing the efficiency of the motor and shortening. Motor life.

The technical solution of the present invention will be further described below with reference to the accompanying drawings 1-2 and by specific embodiments.

As shown in FIG. 1 and FIG. 2, a vacuum cleaner motor according to an embodiment of the present invention includes a stator 5 coaxial with a stator 5 and rotatably disposed in a rotor 6 in the stator 5. The rotor 6 includes a permanent A magnet and a rotor shaft 11 penetrating the stator 5 in an axial direction of the permanent magnet are provided, and the cleaner motor is provided with a magnetic suspension bearing that suspends the rotor 6 in the stator 5.

The magnetic suspension bearing includes at least one lower axial magnetic bearing 9 disposed at one end of the rotor shaft 11 for axially adjusting the position of the rotor shaft 11, and the other end of the rotor shaft 11 is provided with a shaft To the axial fixing plate 2 which adjusts the position of the rotor shaft 11, the axial driving force generated by the lower axial magnetic bearing 9 drives the rotor shaft 11 against the axial fixing plate 2. Specifically, the lower axial magnetic bearing 9 generates an axial magnetic force after the vacuum cleaner motor is energized, and drives the rotor shaft 11 in the direction of the axial fixing plate 2 such that the rotor shaft 11 abuts against the shaft. It is directed to the fixed plate 2 to adjust the rotor in the axial direction.

In the embodiment of the present invention, one end of the rotor shaft 11 is mounted with an impeller 10, and the lower axial magnetic bearing 9 is mounted with one end of the impeller 10 near the rotor shaft 11, and the axial fixing plate 2 is located at the rotor shaft. The end of one end of the impeller 10 is not mounted. The end portion of the rotor shaft 11 corresponding to the axial fixing plate 2 has a curved curved surface. Preferably, the curved curved surface is a hemispherical curved surface or an elliptical curved surface.

The magnetic suspension bearing further includes a radial magnetic bearing disposed on both sides of the permanent magnet for radially adjusting the position of the rotor shaft 11. The vacuum cleaner motor further includes two radial position sensors for monitoring the radial position of the rotor shaft 11, one of the radial position sensors corresponding to one of the radial magnetic bearing arrangements, the radial position sensor Connect the motor control board 1.

In the embodiment of the present invention, two of the radial magnetic bearings are respectively symmetrically disposed with the permanent magnets of the rotor 6, and the two radial position sensors are disposed between the two radial magnetic bearings. And located on both sides of the permanent magnet, the lower axial magnetic bearing 9 and the axial fixed plate 2 are respectively disposed outside the two radial magnetic bearings. Among them, the radial position sensor is used to fit the radial magnetic bearing to adjust the position of the rotor shaft in the radial direction.

Specifically, the two radial magnetic bearings are respectively an upper radial magnetic bearing 3 and a lower radial magnetic bearing 8 disposed on two sides of the permanent magnet, and the two radial position sensors are respectively upper radial A position sensor 4 and a lower radial position sensor 7, the upper radial position sensor 4 corresponding to the upper radial magnetic bearing 3, the lower radial position sensor 7 corresponding to the lower radial magnetic bearing 8.

In other embodiments, the axial fixing plate 2 can be connected to the motor control board 1 and integrated with the motor control board 1 .

The magnetic suspension bearing of the vacuum cleaner motor is controlled by the motor control board. When the motor is started, the position of the rotor shaft is detected by the radial position sensor and the axial position sensor, and the deviation signal of the rotating shaft is transmitted to the motor control board. The controller performs a moderate calculation on the position deviation signal detected by the radial position sensor and the axial position sensor. After the motor power amplifier, the calculated control signal is converted into a control current, and the control current generates a magnetic force in the magnetic suspension bearing. Therefore, the rotor shaft is corrected to the position, so that the rotor shaft can quickly return to the reference position, and after finally determining that the rotor shaft reaches the required position in the axial direction and the radial direction, respectively, the motor starts to operate.

When the vacuum cleaner motor is stopped, the rotor will remain rotated for a certain period of time due to the rotational inertia after the power is turned off. At this time, if the magnetic suspension bearing is de-energized, the rotor loses balance and the motor may be damaged. Thus, the motor needs to be set to be completely in the rotor. After the rotation is stopped, the power supply of the coil on the magnetic suspension bearing is disconnected. In a preferred embodiment, the motor is provided with a charging power source to supply power to the coil of the magnetic suspension bearing, so as to prevent the rotor from losing balance after the motor is powered off, thereby damaging the motor. Continue charging while the motor is starting.

The vacuum cleaner motor can adjust the electromagnetic parameters through the controller during use, so that the rotor has sufficient magnetic pulling force in the axial direction and the radial direction, and the position of the rotor does not change due to the change of the load, thereby ensuring the normal operation of the motor.

According to the dust storage in the vacuum cleaner, the load of the motor will change. When the dust in the vacuum cleaner is more and more, the load of the motor will become larger and larger, resulting in a decrease in the rotational speed of the motor, resulting in a lower vacuum of the vacuum cleaner. The suction force is gradually reduced, and when the vacuum cleaner motor of the present invention is in operation, the controller adjusts the rotation speed of the rotor according to the load of the vacuum cleaner, and when the load is increased, the rotation speed of the rotor is increased, and the vacuum degree of the vacuum cleaner does not occur due to the change of the load. Change to ensure the suction of the vacuum cleaner.

In this process, the axial cooperation between the axial magnetic bearing and the axial fixing plate ensures that the position of the rotor shaft in the axial direction is accurate. At the same time, because the axial fixing plate abuts against the end of the rotor shaft, the impulse applied to the axial fixing plate at the moment of starting the impeller is stopped by the axial fixing plate, thereby avoiding a large displacement of the rotor shaft, and thus the operation is stable. Good sex.

Preferably, in the embodiment, the radial magnetic bearing and the axial magnetic bearing are both made of a metal material, preferably a high-performance metal material can be used to reduce the bearing volume, reduce noise, and improve the efficiency of the motor; In order to cool the air duct, the bearing 12 is cooled while rotating, thereby improving bearing life.

Preferably, in the embodiment, the radial position sensor is fixed on a dedicated fixing plate, and a high-precision positioning structure is arranged on the fixing plate, so that the radial position sensor detects the position deviation of the rotor is small and the precision is high.

The vacuum cleaner motor of the invention is used as a brand new brushless vacuum cleaner motor structure, which is applied to a vacuum cleaner to suspend the rotor by magnetic force, so that there is no mechanical contact between the rotor and the radial magnetic bearing and the axial magnetic bearing, so The motor does not have mechanical wear, and the rotor can run to 150,000 RPM. It has the advantages of no mechanical wear, low energy consumption, low noise, long life, no lubrication, no oil pollution.

The technical principles of the present invention have been described above in connection with specific embodiments. The descriptions are merely illustrative of the principles of the invention and are not to be construed as limiting the scope of the invention. Based on the explanation herein, those skilled in the art can devise various other embodiments of the present invention without departing from the scope of the invention.

Claims

A vacuum cleaner motor comprising a stator (5) and a rotor (6), characterized in that the vacuum cleaner motor is provided with a magnetic suspension bearing that suspends the rotor (6) in the stator (5), the rotor ( 6) comprising a rotor shaft (11), the magnetic suspension bearing comprising at least one lower axial magnetic bearing (9) disposed at one end of the rotor shaft (11) for axially adjusting the position of the rotor shaft (11) The other end end of the rotor shaft (11) is provided with an axial fixing plate (2) for axially adjusting the position of the rotor shaft (11).
A vacuum cleaner motor according to claim 1, wherein said axial driving force generated by said lower axial magnetic bearing (9) drives said rotor shaft (11) against said axial fixing plate (2) .
A vacuum cleaner motor according to claim 1, wherein said lower axial magnetic bearing (9) is mounted with an end of an impeller (10) adjacent to said rotor shaft (11), said axial fixing plate (2) An end portion of one end of the impeller (10) is not mounted on the rotor shaft (11).
A vacuum cleaner motor according to claim 1, wherein an end portion of said rotor shaft (11) corresponding to said axial fixing plate (2) has an arcuate curved surface, said curved curved surface being a hemispherical curved surface Or an elliptical surface.
A vacuum cleaner motor according to claim 1, wherein said rotor (6) further comprises a permanent magnet fixed to said rotor shaft (11), said magnetic suspension bearing further comprising a pair of said permanent magnets A radial magnetic bearing for radially adjusting the position of the rotor shaft (11).
A vacuum cleaner motor according to claim 5, characterized in that the two radial magnetic bearings are respectively symmetrically arranged centering on the permanent magnets of the rotor (6).
A vacuum cleaner motor according to claim 5, wherein said lower axial magnetic bearing (9) and said axial fixed plate (2) are respectively disposed outside of said two radial magnetic bearings.
A vacuum cleaner motor according to claim 5, further comprising two radial position sensors for monitoring the position of said rotor shaft (11) in a radial direction, one of said radial position sensors corresponding to a A radial magnetic bearing arrangement is described, which is connected to a motor control board (1).
A vacuum cleaner motor according to claim 8, wherein two of said radial position sensors are disposed between two of said radial magnetic bearings and on both sides of said permanent magnet.
A vacuum cleaner motor according to claim 8, wherein the two radial magnetic bearings are respectively an upper radial magnetic bearing (3) and a lower radial magnetic bearing (8) disposed on both sides of the permanent magnet The two radial position sensors are respectively an upper radial position sensor (4) and a lower radial position sensor (7), the upper radial position sensor (4) corresponding to the upper radial magnetic bearing ( 3) The lower radial position sensor (7) corresponds to the lower radial magnetic bearing (8).
A vacuum cleaner motor according to claim 1, characterized in that the axial fixing plate (2) is connected to the motor control board (1) and integrated with the motor control board (1).
A vacuum cleaner motor according to claim 1, wherein said cleaner motor is provided with a power source for individually controlling said magnetic suspension bearing.
A cleaner having the vacuum cleaner motor according to any one of claims 1 to 12, wherein the cleaner motor includes a controller that actively adjusts a speed of a rotor of the cleaner motor according to a load amount in the cleaner .