KR100793806B1 - Hybrid induction motor - Google Patents

Abstract

A hybrid inductor motor is provided to manufacture a stator of a simple structure that does not have any groove for wounding a sub coil. A hybrid inductor motor includes a stator(110), a permanent magnet rotor(130), a rotation shaft(140), and a bracket. A driven magnet(136), a driven magnet(164), and a reverse rotation preventing device are configured to prevent reverse rotation. The permanent magnet rotor includes a permanent magnet(131) and a permanent magnet frame(132). The driving magnet is equipped in the permanent magnet frame and rotates on the rotation shaft integrally with the permanent magnet rotor. The permanent magnet frame includes a bearing unit and a coupling unit(134). The bearing is pressed in a center portion of the permanent magnet frame so as to rotatably support the rotation shaft.

Description

Hybrid induction motor

1 is a side cross-sectional view of a conventional shading coil hybrid induction motor.

FIG. 2 is a cross-sectional view of the AA ′ portion of FIG. 1. FIG.

3 is a side cross-sectional view of a hybrid induction motor according to the present invention.

4 is a perspective view of main parts of a hybrid induction motor according to the present invention;

Figure 5 is a plan view showing a state of the reverse rotation prevention device during the forward rotation start of the hybrid induction motor according to the present invention.

Figure 6 is a plan view showing a state of the reverse rotation prevention device during the reverse rotation start of the hybrid induction motor according to the present invention.

7 is an exploded perspective view showing another embodiment of the hybrid induction motor according to the present invention.

* Description of the symbols for the main parts of the drawings *

110: stator 120: rotor

130: permanent magnet rotor 131: permanent magnet

132: permanent magnet frame 133: bearing

134: engaging portion 135: latch stopper

136: driving magnet 137: groove

138: insertion portion 139: separation portion

140: rotation axis 150: bracket

151: bearing 152: bobbin

153: bearing 161: central axis

162: E-ring 163: Latch

164: driven magnet 165: latch rotation guide

The present invention relates to a hybrid induction motor (hereinafter referred to as 'HIM'), and more particularly to a single-phase hybrid induction motor with high efficiency.

In general, single phase induction motors are wound in a stator where the main coil and sub coils are spaced 90 ° away from each other, the power supply voltage is applied directly to the main coil, and the sub coil is applied through a capacitor and a switch. This is because the main coil alone does not start even when a voltage is applied. Therefore, the rotor can be started by generating a magnetic field in the stator through a starting device such as the sub coil.

Such a starting device is classified into a divided phase starting type, a shading coil type, a condenser starting type, or a rebound starting type according to the type thereof.

An example of a single-phase induction motor having such a starting device is a shading coil type single-phase induction motor, which generates an elliptical magnetic field in the stator to enable the starting and rotation of the rotor. Here, a stator coil of one phase is wound around the stator, and a shading coil is wound around the stator coil to serve as the other phase at a predetermined angle.

When only the stator coil is wound around the stator, only an alternating magnetic field is generated in the stator, so that the rotor is not started. Thus, winding a shading coil to the stator generates an elliptical rotor field, and the rotor is started and rotated by the elliptical rotor field in a constant direction.

Of course, in the case of a three-phase induction motor, even if only the main coil is wound on the stator, the rotor field is generated, so that the above-described shading coil or sub coil does not need to be wound on the stator.

On the other hand, recently, a hybrid induction motor (hereinafter referred to as 'HIM') has been provided in which efficiency is improved and driving force is generated uniformly as compared with a conventional induction motor. The HIM is generally capable of providing a highly efficient motor by rotating the rotor by the magnetic flux generated by the stator and the magnetic flux generated by the permanent magnet. That is, the induction motor in which the magnetic flux by the stator and the magnetic flux by the permanent magnet affect the rotational force of the rotor is called HIM.

1 is a side cross-sectional view of a conventional shading coil type hybrid induction motor HIM, and FIG. 2 is a cross-sectional view of part AA ′ of FIG. 1.

As shown in Figs. 1 and 2, the conventional shading coil type HIM 1 is composed of a stator, a rotor, a permanent magnet rotor, a rotating shaft, and a bracket.

The stator 10 is hollow and has a plurality of teeth 11 protruding radially inwardly at predetermined angular intervals along an inner circumferential surface thereof, and the teeth so as to have polarities of N poles or S poles when a primary current is applied. (11) a stator coil 12 wound around each one.

Here, a bobbin 15 is provided between the teeth 11 and the stator coils 12 to perform an insulation function between the teeth and the stator coils and to easily wind the stator coils.

In addition, the stator 10 is wound around the stator coil 12 at a predetermined angle spatially wound around the groove 13 formed on the rotation direction side of the tooth to form an elliptical rotor field when the primary current is applied. It comprises a ding coil 14.

The rotor 20 is generally a squirrel cage rotor (squirrel cage rotor) is used a lot, the swivel rotor is shown in Figs.

The rotor 20 is usually formed by stacking steel sheets having a plurality of slots 21 formed at predetermined angles along an outer circumference of a predetermined radius from a center. In addition, the rotor includes a rod-shaped conductor bar 22 inserted into the slot 21 of the rotor core, which is usually made of copper or aluminum rods.

And, both ends of the cage rotor core is connected to the end ring 23 to form an electrical short through the conductor bar, which is generally formed of aluminum die casting.

On the other hand, the rotor 20 has a shaft hole 24 is formed in the center. The shaft hole is inserted into the rotary shaft 40 for transmitting the rotational force of the rotor to the outside to rotate the rotor and the rotating shaft integrally.

The permanent magnet rotor 30 rotatably supports the permanent magnet 31 and the permanent magnet rotatably provided at predetermined intervals between the stator and the rotor at predetermined intervals, respectively, It includes a permanent magnet frame 32 for supporting to maintain the gap.

Here, the permanent magnet frame has a bearing portion 33 is formed at the center of rotation, the ball bearing 34 is pressed into the bearing portion, for example, so that the permanent magnet rotor is rotatable about the rotating shaft 40. do. In addition, the permanent magnet 31 and the permanent magnet frame 32 is coupled to each other through an adhesive, for example.

In addition, the general HIM includes a bracket 50 to which the stator 10 is fixedly coupled to form an exterior of the HIM and protects various components accommodated therein.

Here, the bracket 50 may be formed of a lower bracket and an upper bracket coupled to the lower bracket to form an overall appearance of the HIM. In addition, the rotation shaft 40 may pass through the upper bracket and the lower bracket, and the rotation shaft may be rotatably supported by the bearing 51 with respect to the brackets, for example.

In addition, in recent years, the stator may be formed as a single injection assembly in order to increase the assemblability of the HIM and to lower the risk of electric shock. That is, the stator core, the stator coils, and the like are integrally formed through BMC molding. Here, the BMC molding may be formed integrally with the lower bracket.

However, in the single-phase HIM including the shading coil type HIM, the stator coil and the shading coil are wound around the stator or the main coil and the sub coil are wound around the stator in order to start the rotor in a constant direction.

That is, these shading coils are not used to generate starting torque unlike conventional induction motors, but are used to make the rotation direction of the rotor constant during starting.

Here, the starting device including the shading coil or sub-coil affects the rotor to rotate in a predetermined direction only when the rotor is started, and affects the rotation of the rotor after the rotor is rotated once. Does not give.

Therefore, unlike conventional induction motors, a HIM that increases efficiency by preventing unnecessary power waste while reducing manufacturing costs by eliminating unnecessary starting devices such as a shading coil or sub-coil, a condenser, and a switch, which does not start, is required. It became.

On the other hand, there is a problem in that the stator is complicated to manufacture because the groove (13) for winding the sub coil is formed separately in the stator.

However, in the case of removing such a starting device, when the single-phase commercial power is supplied, the initial permanent magnet rotor is started in the forward or reverse rotation according to the initial phase of the supplied power, and thus the rotation direction of the rotating shaft through the rotor is There was a problem that depends on.

Therefore, in order to prevent the reverse rotation of the rotary shaft and increase the efficiency, a HIM equipped with a rotor reverse rotation prevention device rather than an electrical configuration has been requested.

The present invention is to solve the above-mentioned problems, an object of the present invention is to provide a single-phase HIM equipped with a reverse rotation prevention device for preventing the reverse rotation of the rotating shaft and increase the efficiency.

In order to achieve the above object, the present invention is the stator coil is wound around the stator when the single-phase power is applied, the permanent magnet rotor is rotated by forward or reverse rotation in accordance with the phase of the power source, the rotation of the permanent magnet rotor A hybrid induction motor in which a rotating shaft rotates integrally with a rotor and the rotor according to a direction, comprising: a driving magnet rotating integrally with the permanent magnet rotor, and a rotational direction of the driving magnet according to the rotation of the driving magnet; It provides a hybrid induction motor comprising a reversely rotating driven magnet, and a reverse rotation prevention device for preventing the reverse rotation of the rotating shaft by preventing the reverse rotation of the drive magnet between the drive magnet and the driven magnet.

Here, the permanent magnet rotor, preferably between the stator and the rotor comprises a permanent magnet rotatable with a predetermined gap and each of them and a permanent magnet frame for rotatably supporting the permanent magnet with respect to the rotation axis. Do.

The driving magnet is provided in the permanent magnet frame is preferably rotated about the rotation axis integrally with the permanent magnet rotor, the driven magnet is rotated about an axis substantially parallel to the central axis of rotation of the drive magnet It is preferable to.

In addition, the central axis of rotation of the driven magnet is preferably rotatably fixed to at least one of the upper bracket and the lower bracket to form the appearance of the motor and protect the internal configuration, the driving magnet and the driven magnet It is preferable that the outer circumferential surfaces substantially face each other.

On the other hand, the permanent magnet frame, the bearing portion is rotatably supported through the rotation shaft in the center, and extends in the radial direction from the bearing portion to engage with the permanent magnet, the gap between the permanent magnet and the stator and It is preferable to include a coupling portion for maintaining a gap between the permanent magnet and the rotor.

Here, the driving magnet is provided around the bearing portion, it can be spatially separated from the permanent magnet through the coupling portion.

In addition, the driving magnet may be integrally formed with the permanent magnet and coupled to the permanent magnet frame. In this case, the permanent magnet may have a plurality of grooves formed at one end of the cylindrical shape, and the groove may be formed in the permanent magnet frame. It is preferable to be inserted into and coupled to the coupling portion. And the groove is preferably formed in the interpolar separation portion of the permanent magnet.

The coupling part preferably includes an insertion part extending radially from the bearing part and inserted into the groove, and a separation part connected to the end of the insertion part and partitioning the permanent magnet up and down on the outer peripheral surface of the permanent magnet.

On the other hand, the anti-rotation prevention device of the HIM according to the present invention, the permanent magnet rotor is provided to extend a predetermined length in the radial direction of the rotation axis is rotated integrally with the latch stopper and the driven magnet to rotate integrally with the drive magnet. And a latch for selectively restraining the latch stopper.

The reverse rotation prevention device further includes a latch rotation guide and a stopper for limiting the rotation angle of the latch.

Here, the latch stopper is formed in a straight shape in the reverse rotation direction, it is preferable to include a plurality of wings formed in a spiral shape in the forward rotation direction, wherein the latch of the wing portion of the blade stop when the latch stopper reverse rotation It is preferable to be inserted between two adjacent wings to restrain the reverse rotation of the latch stopper to prevent the reverse rotation of the permanent magnet rotor.

Hereinafter, exemplary embodiments of the HIM according to the present invention will be described in detail with reference to the accompanying drawings, and detailed descriptions of components overlapping with those described above will be omitted.

First, an embodiment of the HIM according to the present invention will be described with reference to FIGS. 3 to 4. 3 is a longitudinal sectional view of the HIM according to the present invention, and FIG. 4 is a perspective view of main parts of the HIM shown in FIG. 3.

3 to 4, the HIM 100 according to the present invention includes a stator 110, a rotor 120, a permanent magnet rotor 130, a rotation shaft 140, and a bracket 150. consist of. In this case, overlapping details of the components are omitted, and reference numerals denote bearings.

Here, in the HIM according to the present invention, unlike the conventional HIM, since the sub coils or the shading coils are not wound, the HIM is permanently applied according to the phase of the power when single phase power is applied to the stator coils 112 wound on the stator 110. The magnet rotor 130 starts to rotate in any direction. That is, it cannot be predicted in which direction the rotating shaft 140 will rotate when the initial rotor 120 is started. Therefore, it is required to make the rotation direction of the rotation shaft 140 always constant.

Accordingly, the present invention is to allow the rotation axis to forward rotation by a mechanical device, regardless of the electrical or electronic configuration in the HIM that the rotation axis can arbitrarily reverse rotation or forward rotation during the initial startup.

Here, preventing the reverse rotation of the rotating shaft may be made of a driving magnet 136, a driven magnet 164 and the reverse rotation preventing device.

The permanent magnet rotor 130 includes a permanent magnet 131 and a permanent magnet frame 132, the drive magnet 136 is provided in the permanent magnet frame 132 is the permanent magnet rotor ( It is rotated about the rotation shaft 140 integrally with the 130.

The permanent magnet frame 132 may include a bearing part 133 and a coupling part 134.

The bearing part 133 has a bearing 134 is press-fitted so that the rotating shaft penetrates and is rotatably supported at the center of the permanent magnet frame 132. In addition, the coupling part 134 extends in the radial direction from the bearing part 133 to be coupled with the permanent magnet 131, and the gap between the permanent magnet 131 and the stator 110 and the permanent magnet and The gap with the rotor 120 is maintained.

The driving magnet 136 is formed in an annular shape may be coupled to the upper side of the permanent magnet frame 132, the coupling method may be coupled through an adhesive or the like. That is, the permanent magnet frame supports not only the permanent magnet but also the driving magnet so as to be rotatable about the rotation axis.

Meanwhile, a driven magnet 164 is provided on one side of the driving magnet 136 so as to face the driving magnet, and the driven magnet is an axis substantially parallel to the center of rotation of the driving magnet, that is, the rotation shaft 140 ( It is preferred to rotate around 161. This is because the magnetic force generated between the two magnets is kept uniform as both magnets rotate.

In addition, the driving magnet 136 and the permanent magnet 131 is preferably spatially separated through the coupling portion 134. That is, to reduce unnecessary magnetic interference between the permanent magnet and the driven magnet.

Here, when the driving magnet is rotated forward (hereinafter referred to as clockwise rotation is called forward rotation, counterclockwise rotation is called reverse rotation), the driven magnet is reversed by the magnetic force between both magnets . On the contrary, when the driving magnet reverses, the driven magnet rotates forward. That is, the driving magnet and the driven magnet are operated similar to the drive gear and the driven gear by mutual magnetic force.

In addition, the central axis of rotation 161 of the driven magnet may be rotatably fixed to the upper bracket 150 as shown in FIG. 3. Of course, it may be fixed to the lower bracket rotatably.

In addition, the rotational center axis of the driven magnet may be fixed to the upper bracket and the lower bracket rotatably one end and the other end rotatably across the space between the bobbin 152 and the bobbin, the winding of the stator coil, in this case one side Stability will be enhanced rather than supported.

On the other hand, the configuration of the reverse rotation prevention device for preventing the reverse rotation of the rotating shaft between the drive magnet and the driven magnet is as follows.

Here, it may be referred to as a reverse rotation prevention device including the driving magnet and the driven magnet, but for convenience, the driving magnet and the driven magnet is driven in accordance with the drive to prevent the reverse rotation of the permanent magnet rotor reverse rotation It is called a prevention device.

First, a latch stopper 135 is provided on the permanent magnet frame 132. The latch stopper 135 is formed to extend a predetermined length in the radial direction at the center of the permanent magnet frame and is formed to protrude a predetermined length upward from the upper surface of the driving magnet as a whole.

In addition, the latch stopper 135 may include a plurality of wings having a surface formed in a spiral shape in a forward rotation direction of the permanent magnet rotor 130 and a surface formed in a straight shape in a reverse rotation direction. .

In addition, the upper side of the driven magnet 164 is provided with a latch 163 to rotate integrally with the driven magnet, the latch is preferably formed to face the latch stopper. In addition, the latch may be formed to extend in the radial direction toward the rotating shaft 140.

Here, the driven magnet 164 and the latch 163 may be fixed to the central axis 161, for example, a snap ring, an E-ring 162, and the like coupled to the upper side and the lower side to be rotatably fixed.

On the other hand, the reverse rotation prevention device may further include a latch rotation guide 165 for limiting the rotation angle of the latch, which limits the rotation of the latch within a certain range to more stably prevent the reverse rotation of the rotating shaft To do so.

Here, the latch rotation guide 165 may be a groove formed on one side of the latch, for example, a 'U'-shaped groove, in which case a stopper (not shown) is provided inside the groove so that both sides of the groove are provided. The latch may rotate as much as the short distance.

In addition, the latch rotation guide 165 may be a protrusion protruding in the radial direction of the rotation axis from one side of the latch. In this case, stoppers may be provided at both sides of the protrusion to allow the latch to rotate by a distance corresponding to the distance between the protrusions.

In addition, the stopper may be formed to protrude downward to be parallel to the rotation axis inside the upper bracket 150, or may be formed to protrude upward to be parallel to the rotation axis on the stator core.

Hereinafter, the operation of the HIM according to the present invention will be described with reference to FIGS. 5 to 6.

5 is a plan view illustrating the forward rotation, and FIG. 6 is a plan view illustrating the reverse rotation.

When power is applied to the stator coils, the permanent magnet rotor 130 rotates forward or reverse according to the initial phase of the single-phase AC power.

First, in the case where the permanent magnet rotor performs the initial forward rotation, the driving magnet 136 rotates forward integrally with the permanent magnet rotor, and the latch stopper 135 also forward rotates.

As the driving magnet rotates forward, the driven magnet 164 reverses, and the latch 164 reversely rotates integrally with the driven magnet so that the latch is far from the latch stopper so that interference does not occur with each other. do.

Here, since the latch stopper 135 has a rotating blade shape and a spiral shape in the forward rotation direction, the impact may be reduced when the rotating blade and the latch collide with each other when the latch stopper rotates.

Therefore, once the permanent magnet rotor 130 starts to rotate forward because there is no resistance is accelerated to rotate, the rotor 120 and the rotating shaft 140 is also accelerated in accordance with the forward rotation of the permanent magnet rotor It rotates at a predetermined angular velocity.

Here, the driven magnet 164 and the latch 163 may also be continuously rotated in the forward rotation direction. However, since the contact between the latch and the latch stopper may occur, the above-described latch rotation guide and stopper are further included to rotate only to a predetermined angle in the forward rotation direction.

Next, when the permanent magnet rotor 130 performs the initial reverse rotation, the driving magnet 136 reversely rotates integrally with the permanent magnet rotor, and the latch stopper 135 also reversely rotates. .

As the driving magnet reverses, the driven magnet 164 rotates forward, and the latch 162 rotates forward integrally with the driven magnet, resulting in the latch 162 and the latch stopper 135. Interfere with each other.

That is, the latch is inserted into and constrained in a groove between neighboring rotary vanes of the latch stopper such that the latch and the latch stopper cannot rotate. This is because the latch and the latch stopper try to rotate in opposite directions while the latch exerts a reaction force in the direction of the rotation of the latch stopper at a predetermined distance of the rotation axis of the latch stopper.

Therefore, when the initial permanent magnet rotor 130 rotates in reverse, the latch 162 and the latch stopper 135 are restrained from each other so that the rotation of the permanent magnet rotor is stopped, and then the phase of the applied power is changed. When the permanent magnet rotor is started in the forward rotation, the permanent magnet rotor continues to rotate in the forward rotation as described above. In addition, the rotation shaft 140 also rotates forward.

Here, since the latch stopper has a spiral shape in the forward rotation direction in the shape of a rotary vane, the latch can be easily inserted into the groove of the latch stopper when the latch stopper is reversely rotated.

Hereinafter, another embodiment of the HIM according to the present invention will be described with reference to FIG. 7. 7 is an exploded perspective view showing another embodiment of the hybrid induction motor according to the present invention.

As shown in FIG. 7, in the present embodiment, the permanent magnet 131 and the driving magnet 135 are integrally formed unlike the above-described embodiment. Therefore, the shape of the permanent magnet frame 132 for supporting the permanent magnet and the driving magnet is different from the above-described embodiment.

In this embodiment, the permanent magnet is made of a cylindrical shape, one end is formed with a plurality of grooves (137). That is, the upper side of the permanent magnet functions as a driving magnet 135 and the lower side of the permanent magnet functions as a permanent magnet 131 rotating in interaction between the stator 110 and the rotor 120.

On the other hand, in the present embodiment, the permanent magnet frame 132 is composed of a bearing portion 133 and the coupling portion 134, the coupling portion is formed by including the insertion portion 138 and the separating portion 139 again.

Of course, the function of the bearing portion 9333 and the coupling portion 134 in the present embodiment is the same as the above-described embodiment.

The insertion portion 138 is inserted into the groove 137 formed in the permanent magnet extending in the radial direction from the bearing portion 133, the separation portion 139 is connected to the insertion end and the outer peripheral surface of the permanent magnet The permanent magnet is partitioned up and down in the phase.

That is, the upper side of the permanent magnet formed integrally with the separation unit functions as a driving magnet, and the lower side of the separation unit functions as a permanent magnet.

Therefore, according to the present embodiment, it is possible to form the driving magnet and the permanent magnet integrally, so that the configuration of the permanent magnet rotor becomes simpler, thereby improving productivity and reducing manufacturing costs.

Here, the groove 137 may be formed in a rectangular shape, it is preferably formed in the inter-pole separation portion of the permanent magnet. This is because the formation of the groove in the interpolar separation portion can minimize the decrease in the function of the magnet.

On the other hand, since the operation of the HIM according to the present embodiment is the same as the above-described embodiment, description thereof is omitted.

The present invention is not limited to the above-described embodiments, and those skilled in the art can make modifications without departing from the spirit of the present invention, and such modifications are within the scope of the present invention.

According to the present invention described above,

First, it is possible to provide a hybrid induction motor with high efficiency by lowering manufacturing cost and preventing unnecessary power by eliminating unnecessary components such as a shading coil or an auxiliary coil or a capacitor.

Second, since it is not necessary to form a separate groove in which the sub coil is wound, it is possible to manufacture a stator having a simple structure.

Third, since the driving magnet and the driven magnet are used, more reliable reverse rotation prevention device can be realized.

Claims (8)

The stator coil is wound around the stator, and when the single-phase power is applied, the permanent magnet rotor is started and rotated in the forward or reverse rotation according to the phase of the power source, and is integrated with the rotor and the rotor according to the rotation direction of the permanent magnet rotor. In the hybrid induction motor in which the rotary shaft rotates, A driving magnet rotating integrally with the permanent magnet rotor; A driven magnet which rotates in a direction opposite to the direction of rotation of the drive magnet according to the rotation of the drive magnet; And And a reverse rotation prevention device for preventing reverse rotation of the rotation shaft by preventing reverse rotation of the driving magnet between the driving magnet and the driven magnet. The method of claim 1, The permanent magnet rotor, And a permanent magnet rotatable with a predetermined gap therebetween between the stator and the rotor and a permanent magnet frame rotatably supporting the permanent magnet with respect to the rotation axis. The driving magnet, And a hybrid induction motor provided in the permanent magnet frame to rotate about the rotation axis integrally with the permanent magnet rotor. The method of claim 2, And a rotation center axis of the driven magnet is rotatably fixed to at least one of an upper bracket and a lower bracket forming an exterior of the motor and protecting an internal configuration. The stator coil is wound around the stator, and when the single-phase power is applied, the permanent magnet rotor including a permanent magnet and a permanent magnet frame rotatably supporting the permanent magnet in accordance with the phase of the power source is rotated by forward rotation or reverse rotation. In the hybrid induction motor, the rotation axis rotates integrally with the rotor and the rotor in accordance with the rotation direction of the permanent magnet rotor, A driving magnet rotating integrally with the permanent magnet frame; A driven magnet which rotates in a direction opposite to the direction of rotation of the drive magnet according to the rotation of the drive magnet; And It includes a reverse rotation prevention device for preventing the reverse rotation of the rotating shaft by preventing the reverse rotation of the drive magnet between the drive magnet and the driven magnet, The permanent magnet frame, A bearing portion rotatably supported through the rotation shaft at a central portion thereof; And a coupling part extending radially from the bearing part to engage with the permanent magnet and maintain a gap between the permanent magnet and the stator and a gap between the permanent magnet and the rotor. The method of claim 4, wherein The permanent magnet, Hybrid induction motor, characterized in that a plurality of grooves are formed in the inter-pole separation of the cylindrical end, the groove is inserted into the coupling portion of the permanent magnet frame. The method of claim 5, The coupling part, An insertion part extending radially from the bearing part and inserted into the groove; And And a separating part connected to the insertion end and separating the permanent magnet up and down on the outer peripheral surface of the permanent magnet. The method according to any one of claims 1 to 6, The reverse rotation prevention device, A latch stopper provided on the permanent magnet rotor so as to extend a predetermined length in a radial direction of the rotating shaft and integrally rotating with the driving magnet; And a latch that rotates integrally with the driven magnet and selectively restrains the latch stopper. The method of claim 7, wherein The latch stopper, A hybrid induction motor, characterized in that it comprises a plurality of wings formed in a straight line in the reverse rotation direction, a spiral in the forward rotation direction.

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