KR100672382B1 - Hybrid induction motor - Google Patents

Abstract

The present invention relates to a single-phase hybrid induction motor equipped with a mechanical anti-rotation device to prevent the reverse rotation of the rotating shaft and increase the efficiency. To this end, in the present invention, the stator coil is wound around the stator, and when the single-phase power is applied, the permanent magnet rotor is started and rotated according to the phase of the power source, and the rotor and the rotor are rotated according to the rotation direction of the permanent magnet rotor. A hybrid induction motor in which the rotary shaft rotates integrally with the forward rotation or the reverse rotation, the hybrid induction motor comprising: a reverse rotation prevention device for selectively preventing reverse rotation of the rotation shaft by centrifugal force of the permanent magnet rotor; And it provides a hybrid induction motor comprising a return means for returning the reverse rotation prevention device to the initial state by a magnetic force.

HIM, Hybrid Induction Motor, Reverse Rotator, Latches

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 an exploded perspective view of the hybrid induction motor according to the present invention.

Figure 4 is a perspective view showing a reverse rotation prevention device of the 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 immediately before the forward rotation of the hybrid induction motor according to the present invention.

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

* Explanation of symbols for main parts of drawings *

132: permanent magnet frame 133: bearing seat

135: coupling protrusion 151: stopper

160: latch 161: coupling hole

162: latch projection 163: return means

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 sub coil serves to generate an elliptical rotor field in the stator so that the rotor can be started.

An example of such a single phase induction motor is a shading coil type single phase induction motor, which generates a magnetic field in the stator to enable 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 in a predetermined direction by the elliptical rotor field.

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 auxiliary 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.

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 rotational direction side of the tooth to form an elliptical rotor field when the secondary current is applied. It comprises a shading 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.

In addition, both ends of the cage rotor core are connected to the end ring 23 to form an electrical short through the conductor bar, which is generally formed by 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 includes a permanent magnet 31 rotatable at predetermined intervals between the stator and the rotor and a permanent magnet frame 32 rotatably supporting the permanent magnet on the rotating shaft. Is done. Here, the permanent magnet frame has a bearing seating portion 33 is formed in the center of rotation so that, for example, a ball bearing 34 is pressed into the bearing seating portion so that the permanent magnet rotor can rotate about the rotating shaft 40. Supported. In addition, the permanent magnet 31, the permanent magnet frame 32 is coupled to each other through, for example, an adhesive.

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 passes through the upper bracket and the lower bracket, and the rotation shaft is 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. Here, the shading coil or the auxiliary coil affects the rotor to rotate in a predetermined direction only when the rotor is started, and does not affect the rotation of the rotor once the rotor is rotated.

Accordingly, the HIM has been required to reduce the manufacturing cost by eliminating unnecessary components such as the shading coil, the auxiliary coil or the condenser, and to prevent unnecessary power waste.

However, in the case of removing the shading coil or auxiliary coil, when the single-phase commercial power is supplied, the initial permanent magnet rotor is started in the forward or reverse rotation according to the phase of the supplied power, and eventually the rotation of the rotating shaft through the rotor There was a problem that the direction of rotation varies depending on the case.

Therefore, in order to prevent the reverse rotation of the rotating shaft and increase the efficiency, a HIM equipped with a mechanical rotor anti-rotation prevention device, rather than an electrical configuration, was required.

The present invention is to solve the above-mentioned problems, an object of the present invention to provide a single-phase HIM equipped with a mechanical anti-rotation device to prevent 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 on the stator when the single-phase power is applied, the permanent magnet rotor is started in a predetermined direction and rotates according to the phase of the power source, according to the rotation direction of the permanent magnet rotor A hybrid induction motor in which a rotor and a rotating shaft rotating integrally with the rotor perform forward or reverse rotation, the reverse rotation prevention device for selectively preventing reverse rotation of the rotation shaft by centrifugal force of the permanent magnet rotor; It provides a hybrid induction motor comprising a return means for returning the reverse rotation prevention device to the initial state by a magnetic force.

Here, the reverse rotation prevention device includes a latch provided on the upper surface of the permanent magnet frame so as to be movable in the radial direction of the rotation axis and a stopper selectively contacting the latch according to a position moved in the radial direction of the rotation axis of the latch. The stopper may be provided inside the bracket.

In addition, it is preferable that a plurality of stoppers are disposed at a predetermined angle interval in the radial direction from the center of the bracket, and the stoppers are preferably cylindrical protrusions.

The latch may be slidably moved in the radial direction of the rotation axis from the upper surface of the permanent magnet frame by the centrifugal force of the permanent magnet rotor, and the latch may be integrally rotated with the permanent magnet rotor.

On the other hand, the latch is provided with a coupling hole in the center, the coupling projection 135 is inserted into the coupling hole is coupled to the coupling hole around the bearing seating portion 133 of the upper surface of the permanent magnet frame through which the rotating shaft is provided. Do.

The return means means a means for returning the latch to an initial position when the rotation of the rotary shaft stops, and the return means may be a pair of magnets. Here, the pair of magnets may be provided in the latch and the permanent magnet frame, respectively. More specifically, the pair of magnets are provided on the coupling protrusions which are in contact with one side of the coupling hole and one side of the coupling hole, respectively, and apply magnetic force in a direction of suppressing radial movement of the latch with respect to the rotation axis. Do.

Here, in order to return the latch to the initial state by the pair of magnets, the permanent magnet frame and the latch are preferably nonmagnetic.

The coupling hole and the coupling protrusion is different in the number of coupling surfaces according to the position moved in the radial direction of the rotation axis of the latch, the coupling hole and the coupling protrusion is preferably made of a coupling surface in at least two parallel planes. Here, the latch is preferably sliding in the radial direction of the rotation axis along the straight surface with respect to the engaging projection. In addition, the two parallel straight surfaces of the coupling hole and the coupling protrusion are preferably connected to each curved surface.

Preferably, the latch has an eccentric center of gravity based on the rotation axis. Here, the center of gravity is preferably formed between the path in which the latch is moved in the radial direction, one end of the latch that is not the center of gravity is preferably provided with a latch projection selectively contacting the stopper, the latch The end portion of the protrusion is preferably made to include an inclined surface formed in the direction in which the rotating shaft is rotated forward and a vertical surface formed in the direction in which the rotating shaft is reversed rotation.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the HIM according to the present invention, a detailed description thereof will be omitted.

3 is an exploded perspective view of the HIM according to the present invention. As shown, the HIM 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. Here, the detailed description of the component is the same as described above and will be omitted, and reference numerals are bearings.

Here, in the HIM according to the present invention, unlike the conventional HIM, since the sub-coil or the shading coil is not wound, the HIM is applied to the phase of the power source when the single-phase power is applied to the stator coil (not shown) wound on the stator 110. Accordingly, the permanent magnet rotor 130 is started 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 desired that the axis of rotation be such that the direction of rotation is always constant.

Accordingly, the present invention is to rotate the rotation shaft forward by the mechanical device, regardless of the electrical or electronic configuration in the HIM that the rotation shaft 140 can be reverse rotation or forward rotation at the initial startup.

Here, it is preferable to prevent the reverse rotation of the rotating shaft is made through the reverse rotation prevention device using the centrifugal force of the permanent magnet rotor 130.

Figure 4 is a perspective view showing a reverse rotation preventing device and the return means of the hybrid induction motor according to the present invention. Referring to Figure 4 describes the reverse rotation prevention device and the return means of the HIM according to the present invention.

First, the reverse rotation prevention device of the HIM according to the present invention comprises a latch 160 and the stopper 151. Here, the latch 160 is preferably provided on the upper surface of the permanent magnet frame 132 to be movable in the radial direction of the rotary shaft 140, the stopper 151 is provided inside the bracket 150, the latch It is preferably provided to contact the latch selectively in accordance with the position moved in the radial direction of the rotary shaft.

In addition, the stopper 151 is preferably arranged in plurality in a predetermined angle interval in the radial direction with respect to the center of the bracket, the stopper is preferably a cylindrical projection. This is because the torque is very small immediately after the reverse rotation of the permanent magnet rotor is started. Therefore, it is preferable to prevent the reverse rotation immediately after the reverse rotation of the permanent magnet rotor is started. Therefore, it is preferable that a plurality of stoppers are provided.

On the other hand, the latch 160 is preferably capable of sliding in the radial direction of the rotation axis on the upper surface of the permanent magnet frame by the centrifugal force of the permanent magnet rotor. That is, it is preferable that the frictional force is small between the bottom surface of the latch and the top surface of the permanent magnet frame to allow sliding of the latch. However, it is not necessarily sliding but it is also possible that the bottom of the latch is rolling with respect to the upper surface of the permanent magnet frame.

As shown in Figure 4, the latch is provided with a coupling hole 161 in the center, and inserted into the coupling hole 161 around the bearing seat 133 of the upper surface of the permanent magnet frame through which the rotating shaft passes It is preferable that the coupling protrusion 135 is coupled to be.

The coupling hole 161 and the coupling protrusion 135 may have a different number of coupling surfaces depending on a position moved in the radial direction of the rotation axis of the latch, and the coupling hole 161 and the coupling protrusion 135 may be different. ) Is preferably a mating surface with at least two parallel planes.

By the above configuration, that is, through two parallel straight surfaces between the coupling hole 161 of the latch and the coupling protrusion 135 formed around the bearing seating portion 133 of the upper surface of the permanent magnet frame 132. Due to the coupling, the permanent magnet rotor 130 and the latch 160 is rotated integrally.

On the other hand, the movement of the latch in the radial direction with respect to the rotation axis is due to the centrifugal force generated when the permanent magnet rotor rotates. That is, for this purpose, the latch is preferably eccentric with respect to the rotation axis.

As shown in FIG. 4, two parallel straight surfaces are provided between the coupling hole of the latch and the coupling protrusion. That is, the latch is able to slide in the radial direction through the two parallel straight surfaces.

Here, it is preferable to set the range of the radial reflection movement by forming the width of the coupling hole 161 larger than the width of the coupling protrusion 135. That is, the width of the coupling hole in the longitudinal direction of the latch is preferably formed to be wider.

In addition, when the latch is the maximum position in the radial direction or the initial position of the latch when the engaging surface between the engaging hole of the latch and the engaging projection is preferably made of a curved surface. This is because the latch 160 may move in the radial direction to minimize the impact of the collision between the coupling hole 161 and the coupling protrusion 135.

On the other hand, as described above, in order for the latch 160 to automatically move in the radial direction by the centrifugal force by the permanent magnet rotor 130, the center of the latch should be eccentric, and the eccentric center of gravity of the latch Is preferably positioned coincident on the radial movement path. That is, to allow the latch to move in the radial direction even by a small rotation.

The shape of the preferred latch of the above-described latch is as shown in Figs. That is, one end of the latch having no center of gravity is provided with a latch protrusion 162 selectively contacting the stopper 151, the other end of the latch 160 is formed with a wide surface so that the center of gravity is located This is preferred.

Here, the end of the latch protrusion 162, preferably comprises an inclined surface formed in the direction in which the rotating shaft is rotated forward and a vertical surface formed in the direction in which the rotating shaft is reversely rotated. That is, since the inclined surface of the latch protrusion and the stopper contact the inclined surface when the rotating shaft rotates forward, the force to which the latch rotates and the force to which the latch moves in the radial direction are operated in combination so that the rotating shaft is It will continue to rotate forward and the latch will continue to move in the radial direction.

On the other hand, when the rotating shaft is rotated counterclockwise, the vertical surface of the latch projection and the stopper contact the vertical surface, the force that the latch tries to rotate is completely blocked and thus the latch cannot move in the radial direction.

Next, the return means of the HIM according to the present invention may consist of a pair of magnets. That is, the return means serves to return the latch to the initial position when the rotation of the rotary shaft stops. In other words, such a reverse rotation prevention device is not used once, but the reverse rotation of the rotating shaft must be prevented every time the HIM starts to operate.

That is, if the latch does not move to the initial position when the rotating shaft is stopped while the rotating shaft is forwardly rotated and the latch is completely moved in the radial direction, the contact between the latch 160 and the stopper 151 is prevented. There is no need to return the latch to its initial position.

As the return means 163, the pair of magnets may be provided in the latch and the permanent magnet frame, respectively. In more detail, as shown in FIG. 4, the pair of magnets may be provided on a portion where the center of gravity of the latch is formed and the upper surface of the permanent magnet frame corresponding thereto.

In addition, although not shown, the pair of magnets are provided in the coupling protrusions which are in contact with one side of the coupling hole and one side of the coupling hole of the latch, respectively, in a magnetic force in a direction of suppressing radial movement of the latch with respect to the rotation axis. You can also add

Here, in order to return the latch to the initial state by the pair of magnets, the permanent magnet frame and the latch are preferably nonmagnetic.

Hereinafter, the operation of the reverse rotation prevention device and the return means of the magnetic force of the HIM according to the present invention with reference to FIGS.

When the operation of the rotary shaft 140 is stopped, the position of the latch 160 may be as shown in FIG. 5 or 7, and although not shown, the latch protrusion 162 of the latch is disposed between neighboring stoppers 151. Can be located.

First, if the permanent magnet rotor 130 is started in a forward rotation (clockwise rotation is called a forward rotation) when the power is applied, the permanent magnet frame 132 is a forward rotation, accordingly the rotation shaft 140 also rotates Will be conveyed.

In this case, as shown in FIG. 5, the latch protrusion 162 and the stopper 151 are in contact with the inclined surface of the latch protrusion. In this case, the force to which the latch is to rotate and the latch to move in a radial direction This combined operation causes the axis of rotation to continue to rotate forward and the latch to continue to move in the radial direction.

That is, as shown in FIG. 6, the latch moves in the radial direction, and as the rotation of the permanent magnet rotor 130 becomes faster, the latch moves in the radial direction. Therefore, the rotating shaft continues to rotate forward, and the latch and the stopper do not contact each other.

In this case, a tensile magnetic force is generated in each of the magnets provided in the latch and the permanent magnet frame to generate a magnetic force for returning the latch to an initial position, and on the other hand, the latch has a radius due to the rotational force caused by the rotation of the latch. The force to move in the direction, or centrifugal force, is generated. However, since the centrifugal force is larger than the magnetic force, the latch protrusion and the stopper do not contact each other.

On the other hand, the magnetic force is increased by the magnet when the rotation of the latch is stopped, the latch is returned to the initial position.

Next, when the permanent magnet rotor 130 is started in reverse rotation when the power is applied, the permanent magnet frame 132 is reversely rotated, and thus the rotating shaft 140 is also reversely rotated.

However, as shown in FIG. 7, the vertical surface of the latch protrusion 162 and the stopper 151 come into contact with each other so that the latch cannot be reversed anymore, and thus the latch 160 may move in a radial direction. It is also prevented.

Thereafter, if the phase of the applied power is changed and the permanent magnet rotor rotates forward, the rotor eventually rotates forward. Thus, in any case, the rotation shaft can perform forward rotation without reverse rotation.

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, it is possible to provide a hybrid induction motor that prevents the reverse rotation of the rotating shaft mechanically rather than the electrical configuration.

Claims (17)

The stator coil is wound around the stator so that when the single-phase power is applied, the permanent magnet rotor starts and rotates according to the phase of the power source. In the hybrid induction motor in which the rotor and the rotating shaft that is integrally rotated with the rotor in accordance with the rotation direction of the permanent magnet rotor is in the forward or reverse rotation, A reverse rotation prevention device for selectively preventing reverse rotation of the rotating shaft by centrifugal force of the permanent magnet rotor; And And a return means for returning the reverse rotation prevention device to an initial state by a magnetic force. The method of claim 1, The reverse rotation prevention device, A latch provided on an upper surface of the permanent magnet frame to be movable in the radial direction of the rotation axis; And And a stopper selectively contacting the latch according to a position moved in the radial direction of the rotation axis of the latch. The method of claim 2, The stopper is a hybrid induction motor, characterized in that provided on the inside of the bracket. The method of claim 3, The stopper is a hybrid induction motor, characterized in that arranged in plurality in the radial direction from the bracket center at a predetermined angle interval. The method of claim 4, wherein The stopper is a hybrid induction motor, characterized in that the cylindrical projection. The method of claim 2, The latch is a hybrid induction motor, characterized in that the sliding movement in the radial direction of the rotation axis from the upper surface of the permanent magnet frame by the centrifugal force of the permanent magnet rotor. The method of claim 6, And said latch rotates integrally with said permanent magnet rotor. The method of claim 2, The latch is provided with a coupling hole in the center, Hybrid induction motor, characterized in that the engaging projection is inserted into the coupling hole is coupled around the bearing seating portion of the upper surface of the permanent magnet frame through which the rotating shaft passes. The method of claim 8, The return means is a hybrid induction motor, characterized in that a pair of magnets provided in the latch and the permanent magnet frame. The method of claim 8, The coupling hole and the coupling protrusion is a hybrid induction motor, characterized in that the number of the coupling surface is changed according to the position moved in the radial direction of the rotation axis of the latch. The method of claim 10, The coupling hole and the coupling protrusion is a hybrid induction motor, characterized in that the coupling surface is made of at least two parallel planes. The method of claim 11, The latch is a hybrid induction motor, characterized in that the sliding movement in the radial direction of the axis of rotation along the straight surface with respect to the engaging projection. The method of claim 11, Hybrid induction motor, characterized in that the two parallel parallel surfaces of the coupling hole and the coupling projection is connected to each of the curved surface. The method of claim 2, The latch has a hybrid induction motor, characterized in that having a center of gravity eccentric with respect to the rotation axis. The method of claim 14, The eccentric center of gravity is located in a radial movement path with respect to the axis of rotation of the latch The method of claim 15, Hybrid induction motor, characterized in that the latch projection which is in contact with the stopper is provided at one end of the latch having no center of gravity. The method of claim 16, The end of the latch projection, An inclined surface formed in a direction in which the rotation shaft rotates forward; And Hybrid induction motor, characterized in that it comprises a vertical surface formed in the direction in which the rotating shaft is reverse rotation.

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