KR20060097263A - Damping device of sr motor - Google Patents

Abstract

The present invention relates to a braking device for an SR motor, and more particularly, to a stator wound with a coil; A rotor that rotates by electromagnetic force generated between the stator; A ring magnet coupled to the rotor to rotate together and magnetized alternately with the north pole and the south pole along the rotating direction; A braking member including an electromagnet installed in a state spaced apart from the magnetized surface of the ring magnet; It is composed of a Hall sensor for detecting the position and speed of the rotor by detecting a change in the magnetic field according to the rotation of the ring-shaped magnet.

According to the present invention as described above, when the electromagnet of the braking member is activated only when braking is applied to the rotor, the braking force is applied to the ring magnet by magnetic force, and the braking member is not operated when the rotor is rotated. The operating speed is improved by increasing the rotation speed of electrons.

SR motor, electromagnet, ring magnet, rotor

Description

DAMPING DEVICE OF SR MOTOR

1 is a circuit diagram of a conventional SR motor.

2 is a perspective view of a conventional SR motor 2.

3 is a cross-sectional view of a conventional SR motor 2.

4 is a cross-sectional view showing a braking device of an SR motor according to an embodiment of the present invention.

5 is a cross-sectional view showing a braking device of an SR motor according to another embodiment of the present invention.

FIG. 6 is a view illustrating a main configuration of an installation state of a ring magnet and a braking member in FIG. 4.

FIG. 7 is a view illustrating a main configuration of an installation state of a ring magnet and a braking member in FIG. 5.

FIG. 8 is a view showing a main configuration of an installation state of a ring magnet and a braking member according to another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

20: stator 30: rotor

32: rotating shaft 34: bearing

40,45: Ring magnet 42: Side

44: upper surface 50: braking member

52: coil 54: rigid body

60: bracket 70: Hall sensor

75: fixing part 80: braking member

82: rigid body 84: coil

90: bracket

The present invention relates to a braking device of an SR motor, and by installing a braking member operated by an electromagnet on one side of a ring-shaped magnet rotated together with the rotor, the electromagnet of the braking member does not operate during rotation of the rotor. The present invention relates to a braking device for an SR motor, in which the rotational speed of the rotor is increased to improve operating efficiency.

1 is a circuit diagram of a conventional SR motor.

According to the related art, a single-phase switch reluctance motor (SRM) includes a stator 2 wound around a driving unit 10, a field coil 2a receiving current from the driving unit 10, and the fixed field ( It is made of a rotor (4) and the like rotated in one direction by the reluctance torque generated between the stator (2) when the current flows in the field coil (2a) is inserted into the inside of 2).

The stator 2 includes a yoke 2b formed in a cylindrical shape having an open top and bottom, a protrusion 2c formed at a predetermined interval in the circumferential direction toward the rotor from the inner wall of the yoke 2b, and the protrusion It consists of the field coil 2a wound by (2c).

The rotor 4 is formed by stacking cores 4b having protrusions 4a protruding at predetermined intervals in a circumferential direction, and a rotation shaft for transmitting a driving force of a motor to the outside in the center of the rotor 4 ( 6) is built up and rotates with the rotor 4. The driving unit 10 receives a signal from an optical sensor or a hall sensor that detects the position or speed of the rotor 4 to change the strength of the current flowing through the field coil.

As described above, in the single-phase switched reluctance motor, when a current flows through the field coil 2a by the driving unit 10, reluctance torque is generated between the stator 2 and the rotor 4 so that the resistance of the magnetic circuit is increased. Rotate in the direction of minimum.

The single-phase switch reluctance motor winds an auxiliary coil (not shown) on the stator pole 2c of the stator or uses a magnetic force to activate the rotor pole 4a of the rotor with respect to the stator pole 2c of the stator. Since it is located in the generating area, the rotary shaft 6 is always rotated in one direction.

However, the single-phase switch reluctance motor has a disadvantage in that manufacturing costs are increased due to the complexity of additional devices for starting and operating.

In order to solve such a disadvantage, the single-phase switched reluctance motor (hereinafter, referred to as 'SR motor 2') described in patent application 2002-599927 has been proposed.

2 is a perspective view of a conventional SR motor 2, Figure 3 is a cross-sectional view of a conventional SL motor 2.

The conventional SR motor 2 has a rotor (12) in which a field coil is wound, a rotor (12) rotated by an electromagnetic force generated between the stator (11), and the rotor (12) to be integrally rotated. The rotor 12 is braked to the effective torque generating region by using a coupled ring magnet 13 and a magnetic force generated between the ring magnet 13 and the brake magnet disposed on one side of the ring magnet 13. It is disposed on the other side of the parking magnet 14 and the ring-shaped magnet 13 to detect the change in the magnetic field generated between the ring-shaped magnet 13 when the rotor 12 rotates the rotor 12 It is configured to include a Hall sensor 15 for detecting the position and speed of the).

The conventional SR motor 2 has a structure that is relatively simpler than that of the conventional motor, and a bar magnet shaped parking magnet 14 for braking the rotor 12 and setting an initial starting position of the rotor 12 is provided. It is spaced apart from the ring magnet 13.

However, the parking magnet 14 is a permanent magnet, and the magnetic force of the parking magnet 14 affects the ring magnet 13 even when the rotor 12 is not a braking operation. There is a problem that the rotation speed of the rotor 12 is lowered.

And, because the magnetized length of the parking magnet 14 acting on the ring magnet 13 is relatively short, braking of the rotor 12 is not performed quickly and accurately in the high speed rotation of the SR motor. This causes a problem of deterioration of operation reliability.

SUMMARY OF THE INVENTION An object of the present invention for solving the above-mentioned conventional problems is that the braking of a rotor having a relatively high rotation speed is not performed quickly, thereby deteriorating operation reliability, and by the magnetic force of the parking magnet in the driving mode of the motor. It is to provide a braking device of an SR motor for solving the problem that the rotation speed of the rotor is lowered.

The present invention for achieving the above object, the coil is wound around the stator; A rotor that rotates by electromagnetic force generated between the stator; A ring magnet coupled to the rotor to rotate together and magnetized alternately with the north pole and the south pole along the rotating direction; A braking member including an electromagnet installed in a state spaced apart from the magnetized surface of the ring magnet; It is composed of a Hall sensor for detecting the position and speed of the rotor by detecting a change in the magnetic field according to the rotation of the ring-shaped magnet.

Preferably, the ring magnet is magnetized alternately with the north pole and the south pole in the circumferential direction along the side, and the braking member is provided at a position spaced apart from the side of the ring magnet.

The N-pole and S-poles are alternately magnetized in the circumferential direction along the upper surface of the ring magnet, and the braking member is installed on an upper side of the ring magnet that is spaced apart from the upper surface of the ring magnet.

In addition, the braking member is installed at an equal angle along the circumferential direction while being spaced apart from the ring magnet.

 According to the present invention as described above, when the electromagnet of the braking member is activated only when braking is applied to the rotor, the braking force is applied to the ring magnet by magnetic force, and the braking member is not operated when the rotor is rotated. The operating speed is improved by increasing the rotation speed of electrons.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

 4 is a cross-sectional view showing a braking device of an SR motor according to an embodiment of the present invention, Figure 5 is a cross-sectional view showing a braking device of an SR motor according to another embodiment of the present invention, Figure 6 Fig. 7 is a view showing the main configuration of the installation state of the ring magnet and the braking member, Figure 7 is a view showing the main configuration of the installation state of the ring magnet and the braking member in Figure 5, Figure 8 is another embodiment of the present invention Fig. 1 shows the main part structure of the installation state of the ring magnet and the braking member.

The SR motor according to an embodiment of the present invention is a single-phase switched reluctance motor (SRM), the basic operation structure of which is described in the related art.

The SR motor includes a cylindrical stator having a coil wound thereon and having a hollow; A rotor 30 which rotates by an electromagnetic force generated between the stator 20; Ring magnets (40, 45) coupled to the rotor (30) and rotated together, wherein the N pole and the S pole are alternately magnetized along the rotating direction; It is fixedly spaced apart from the magnetized surfaces of the ring magnets 40 and 45 to brake the rotor 30 to the effective torque generating area during braking, and is provided with an electromagnet having magnetism only by application of power. Member 50; Hall sensor 70 for detecting the position and speed of the rotor by detecting a change in the magnetic field according to the rotation of the ring-shaped magnet (40, 45).

The stator 20 is formed of a hollow donut-shaped yoke, a salient pole protruding circumferentially toward the inner rotor 30 from an inner wall of the yoke, and a coil wound around each salient pole.

The rotor 30 is formed in the center of the stator 20, the rotor 30 is formed by stacking cores protruding protrusions at a predetermined interval along the circumferential direction, and rotates through the rotating shaft 32 To transmit power.

In addition, a rotating shaft 32 which transmits a driving force of the motor to the outside of the rotor 30 is rotatably installed in a motor housing forming an exterior of the motor, and bearings 34 are disposed on upper and lower portions of the rotating shaft 32. ) Is installed to minimize the friction generated during the rotation operation of the rotary shaft (32).

Ring-shaped magnets 40 and 50 having a ring shape are fixed to the rotating shaft 32 located above the rotor 30.

As shown in Figure 4 and 6, the ring-shaped magnet 40 according to an embodiment of the present invention is formed with a side surface 42 and the upper surface 44, respectively, the circumferential direction on the side 42 Accordingly, the N pole and the S pole are alternately magnetized to form.

In addition, a braking member 50 having an electromagnet is fixedly installed at a side spaced apart from the side surface of the ring magnet 40.

The braking member 50 is mounted to the bracket 60 extending from the housing (not shown) of the motor, and is installed in a state in which a coil 52 to which power is supplied is wound on the rigid body 54.

Since the braking member 50 is supplied with power only when the motor is braked, the electromagnet becomes magnetic, and thus the rotor 30 is braked to the effective torque generating region by using a magnetic force generated between the braking magnet 40. Let's do it.

On the other side of the ring magnet 40, the Hall sensor 70 is mounted on the fixing part 75 extending from the housing of the motor, and the magnetic sensor is changed by the rotation of the ring magnet 40. Thus, the rotational speed of the rotor 30 is measured.

In addition, according to another embodiment of the present invention, as shown in FIGS. 5 and 7, the north pole and the south pole are alternately magnetized along the upper surface 44 of the ring magnet 45 in the circumferential direction. A braking member 80 is installed on the upper side spaced apart from the upper surface 44 of the ring magnet 45.

The magnet 42 may also have magnetic properties on the side surface 42 of the ring magnet 45, but the magnet is mainly formed on the top surface 44, and the top surface 44 of the ring magnet 45 is maximized to maximize space utilization. The braking member 80 is installed on the spaced upper side.

The braking member 80 is mounted on the bracket 90 and is fixedly installed. The braking member 80 is installed in a state where the coil 84 is wound around the rigid body 82, and thus, the electromagnet is formed only by the coil 84. You will have strong magnetism.

According to another embodiment of the present invention, as shown in FIG. 8, two or more braking members 50 are installed along the circumferential direction while being spaced apart from the ring-shaped magnet 40, and the braking member 50 is provided. ) Are installed at a certain angle to each other.

The number of poles composed of the N poles and the S poles of the magnets formed on the ring magnets 40 and 45 is twice the number of the poles formed on the stator 20 or the rotor 30.

According to the present invention as described above, by using the electromagnet as compared to the use of the permanent magnet as the braking member 80, it is to minimize the generation of back EMF generated by the parking magnet when the conventional rotor 30 rotates It will increase the efficiency of the SR motor.

The operation of this embodiment configured as described above is as follows.

When current flows through the coil of the stator 20, reluctance torque is generated between the stator 20 and the rotor 30, so that the rotating shaft 32 and the ring magnets 40 and 45 together with the rotor 30 are formed. It will rotate in the effective direction of rotation.

In the operating state in which the rotor 30 is rotated, electricity is not applied to the coils 52 of the braking members 50 and 80, which causes the braking members 50 and 80 to have no magnetic force. The rotation of the ring magnet 40 is not affected.

That is, since the braking members 50 and 80 are not operated during the rotation operation of the rotor 30, the magnetic force for suppressing the rotation operation of the ring magnet 40 rotated together with the rotor 30 is reduced. It does not occur.

When power is applied to the coil of the braking member to brake the rotor 30, the rigid body is magnetized to have magnetism.

As described above, the braking members 50 and 80 stop the rotation of the ring magnet 40 by interaction with a magnet magnetized in the ring magnet 40, whereby the rotor 30 generates an effective torque generating region. To be located at

As shown in Figure 4 and 6, according to an embodiment of the present invention, the ring magnet 40 is magnetized on the side, by the braking member 50 spaced apart from the side of the ring magnet 40 The rotation of the ring-shaped magnet 40 is restrained.

And, according to another embodiment of the present invention, as shown in Figure 5 and 7, the upper surface 44 of the ring magnet 45 is magnetized, the upper surface 44 of the ring magnet 45 In order to restrain the rotation of the ring-shaped magnet 45 by the braking member 80 spaced upwardly.

Further, according to another embodiment of the present invention, by installing two or more braking members 50 spaced apart from the ring magnet 40, to provide a braking force by a stronger magnetic force during braking, the rotation of the motor Since it does not have magnetism in the middle, it provides the improved performance of the rotor 30.

In the ring-shaped magnet 40 and the braking member 50 used for braking the rotor 30, a section in which magnetic forces act on each other is formed relatively long along the circumferential direction, so that the rotor 30 The braking and initial starting state of the motor can be achieved quickly, improving the operation reliability of the SR motor.

On the other hand, the magnetic force generated between the N pole of the ring magnet (40, 45) and the S pole of the braking member (50, 80), the S pole and the braking member (50, 80) of the ring magnet (40, 45) By the magnetic force generated between the N poles of the ring magnets (40, 45) is stopped at the set position.

In addition, the hall sensors 70 are installed on the side surfaces of the ring magnets 40 and 45 to detect a change in the magnetic force caused by the rotation of the ring magnets 40 and 45, and thus the degree of rotation of the rotor 30. Will be measured.

According to the braking apparatus of the SR motor according to the present invention as described above, the power supply is not supplied to the braking members (50, 80) during the rotation operation of the rotor 30, the ring-shaped magnet 40 is rotated There is no unnecessary influence of the magnetic force is the rotational speed of the rotor 30 is further faster.

As described above, according to the braking apparatus of the SR motor according to the present invention, since the braking member formed of the electromagnet does not have magnetism in the driving mode of the motor, unnecessary braking force is not imparted to the ring-shaped magnet so that the speed of the rotor It becomes faster and provides the effect of improving the operation efficiency.

In addition, since the magnetic force generating area for applying the braking force is increased by a plurality of braking members installed along the ring-shaped magnet formed in a ring shape, the braking or initial starting of the rotor can be made more quickly and accurately even at a relatively high speed rotation. It provides an effect of improving the operation reliability of.

Claims (4)

A stator wound with a coil; A rotor that rotates by electromagnetic force generated between the stator; A ring magnet coupled to the rotor to rotate together and magnetized alternately with the north pole and the south pole along the rotating direction; A braking member including an electromagnet installed in a state spaced apart from the magnetized surface of the ring magnet; Braking device of an SR motor, characterized in that it comprises a Hall sensor for detecting the position and speed of the rotor by detecting a change in the magnetic field according to the rotation of the ring-shaped magnet. The brake of claim 1, wherein the ring magnet is magnetized alternately with the north pole and the south pole in a circumferential direction along the side of the ring magnet, and the braking member is installed at a position spaced apart from the side of the ring magnet. Device.  2. The ring magnet according to claim 1, wherein the N-pole and the S-pole are alternately magnetized in the circumferential direction along the upper surface, and the braking member is installed at an upper side spaced apart from the upper surface of the ring-shaped magnet. Brake of the motor.  2. The braking device of an SR motor according to claim 1, wherein the braking member is installed at an equal angle along the circumferential direction while being spaced apart from the ring magnet.

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