KR101823878B1 - Rotor of spoke type motor easy to connect shaft - Google Patents

Abstract

The present invention relates to a rotor of a spoke type motor in which a shaft is easily fastened, a rotor of a spoke type motor in which a shaft is inserted into a center portion of a hollow core, and a plurality of magnets are radially embedded around the shaft And more particularly to a spoke type motor in which a serrated serration is formed on the inner periphery of a hollow hole of the core to thereby make the shaft inevitably fit.
The rotor of the spoke type motor, which is easy to fasten the shaft, forms a serration in the hollow hole of the core so that the shaft can be forced into the core, so that the core and the shaft are easily fastened, And the like.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rotor of a spoke type motor,

The present invention relates to a rotor of a spoke type motor in which a shaft is easily fastened, a rotor of a spoke type motor in which a shaft is inserted into a center portion of a hollow core, and a plurality of magnets are radially embedded around the shaft And more particularly to a spoke type motor in which a serrated serration is formed on the inner periphery of a hollow hole of the core to thereby make the shaft inevitably fit.

The spoke type motor is a radial type magnet such as a wheel. In the prior art for a rotor of a spoke type motor, a core 1 coupled to a shaft is disclosed in Published Utility Model Publication No. 2015-0003587. Several ferrite A plurality of slots formed to be embedded in the radial spoke type of the magnet, a plurality of slots formed at the ends of each slot of the core so as to protrude inwardly from both sides so that the ferrite magnet is not separated from the core when the rotor rotates at high speed, Wherein the core is divided into three stages of core members so that each of the core members in the shaft is laminated in a skewed form so that the ferrite magnets do not coincide with each other and the ferrite magnets are stacked in a fan shape between the ferrite magnets. A magnetic flux barrier of the formed core is provided, and both ends of the magnetic pole surface, which is the outside of the magnetic flux barrier, Wherein the arc is eccentric with the arc of the magnetic pole surface and has a smaller arc radius than the arc of the magnetic pole surface to narrow the distance from the outer end of the ferrite magnet to the pole face, Holes are formed to form a single motor rotor, and a spoke type motor rotor is disclosed

Another prior art is a stator having a stator core formed in a radial fashion around a rotating shaft in the specification of Published Unexamined Patent Application No. 2015-0080843; A rotor core disposed radially in parallel with the stator along the rotation axis,

A rotor having a permanent magnet disposed radially between the rotor and the rotor; And an anti-scattering rotor housing which is formed to surround the outer circumferential surface of the rotor and prevents scattering of the permanent magnet when the rotor rotates.

As a prior art relating to a rotor of a spoke type motor and a method of manufacturing the same, Japanese Patent Publication No. 0624817 discloses a stator, And a rotor in which a plurality of rotor teeth arranged radially and spaced apart from each other in a circumferential direction by a predetermined gap from the stator are disposed in the stator and a magnet is inserted between the rotor teeth, ; And a non-magnetic back yoke for coupling one side of the plurality of rotor teeth is provided at the center of the rotor, wherein the coupling sheet, in which the magnetic sheet and the non- A cutting process in which a rotor tooth is continuously formed on the magnetic body surface in the longitudinal direction of the binding sheet and a back yoke is continuously formed on the non-magnetic body surface in the longitudinal direction of the binding sheet; A lamination step of laminating the cut sheets in a circumferential direction by a spiral method; Assembling the stacked sheets in a stacking direction when they form a predetermined thickness; And press-fitting the magnet into the space between the rotor teeth.

However, the rotor of the conventional spoke type motor has a disadvantage that the output is reduced due to a large leakage of magnetic flux, and the serration is formed on the outer circumference of the shaft, complicating the manufacturing process and making it difficult to fasten the shaft and the core.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotor of a spoke type motor in which a core and a shaft can be easily fastened so that a shaft can be embedded in a core by forming a serration in a hollow hole of the core .

A rotor of a spoke type motor in which the shaft of the present invention can be easily fastened is provided with a shaft inserted into a center portion of a core 110 in the shape of a hollow body and having a plurality of magnets radially embedded around the shaft, And a serration serration is formed on the inner periphery of the hollow hole of the core, so that the shaft is forcedly inserted.

The rotor of the spoke type motor, which is easy to fasten the shaft, forms a serration in the hollow hole of the core so that the shaft can be forced into the core, so that the core and the shaft are easily fastened, And the like.

1 is a plan view of a core mounted on a rotor of a spoke type motor of the present invention;
2 is a perspective view showing a laminated structure of a core and a fixed plate in a rotor mounted on a spoke type motor;
3 is a plan view of a core in a rotor of a spoke type motor.
4 is a flow chart of the magnetic flux due to the shape of the core.
5 is a plan view of a fixing plate in a rotor.
6 is a flow chart of the magnetic flux due to the fixed plate shape.
7 is a perspective view of a rotor of a spoke type motor according to the present invention.
8 is a view showing a manufacturing process of a rotor of a spoke type motor of the present invention.
Fig. 9 is an analysis chart of a core shape mounted on the spot-type motor of the present invention. Fig.
10 is a magnetic flux flow diagram according to a change in thickness of a core of a core.
11 is a graph showing data obtained by measuring a cogging torque according to the shape of a core mounted on a conventional spot-type motor.
12 is a graph showing data obtained by measuring the cogging torque according to the shape of the core mounted on the spot-type motor of the present invention.
13 is a graph showing a measurement of a cogging torque according to a shape of a core mounted on a spot-type motor of the present invention.

A rotor of a spoke type motor in which a shaft (200) is inserted into a central portion of a hollow core (110) and a plurality of magnets (130) are radially embedded around the shaft (200) A serration serration is formed at the inner periphery of the hollow hole 113 of the core 110, and the shaft 200 is forcedly inserted.

The core 110 is composed of an inner core 111 and an outer core 112 which are concentric with each other and a plurality of magnets 130 are radially embedded in the outer core 112, Shaped fixing plate 120 for fixing the inner core 111 and the outer core 112 to the fixing plate 120. The fixing plate 120 is fixed to the inner fixing plate 121 and the outer fixing plate 122 concentrically The inner fixed plate 121 and the outer fixed plate 122 are fixed to each other by a plurality of connecting members 125 formed along the circumferential direction and the outer fixed plate 122 is provided with a plurality And the slot 124 of the base plate 130 is radially formed.

A plurality of the cores 110 are stacked, and a fixing plate 120 is mounted between the stacked cores 110 to fix the stacked cores 110.

The slot 124 is opened toward the inner fixing plate 121 and the magnet 124 is fixed to the outer circumference of the inner fixing plate 121 so as not to be separated through the space in which the magnet 130 embedded in the slot 124 is opened. A plurality of protrusions 126 are formed to fix the protrusions 130.

The shaft 200 fastened to the inner core 111, the outer core 112 and the inner core 111 and the plurality of magnets 130 embedded in the outer core 112 are fastened together by inserter molding, .

The outer core 112 is formed by a combination of a plurality of split pieces divided in an arc shape. A space portion 114 is formed at a predetermined interval between the split pieces, and the magnet 130 The outer core 112 is engaged with the inner core 111 and then the centrifugal force is generated by the shaft 200 when the outer core 112 is rotated by the shaft 200. In this case, So that the magnet 130 is not released to the outside.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a rotor of a spoke type motor with which the shaft of the present invention can be easily attached will be described in detail with reference to the accompanying drawings.

1 is a plan view of a core mounted on a rotor of a spoke type motor of the present invention.

As shown in FIG. 1, a rotor of a spoke type motor in which a shaft of the present invention is easy to be fastened has a shaft 200 inserted in the center of a hollow core 110, Like serration is formed on the inner circumferential edge of the hollow hole 113 of the core 110 so that the shaft 200 is forcedly inserted.

Fig. 3 is a plan view of the core in the rotor of the spoke type motor, Fig. 4 is a flow chart of the magnetic flux due to the core shape, Fig. 5 is a cross- 6 is a flow chart of the magnetic flux due to the fixed plate shape.

2 to 6, the rotor 100 of the spoke type motor of the present invention has a shaft 200 inserted into a center portion of a hollow core 110, And a plurality of magnets 130 are radially embedded.

More specifically, the core 110 includes an inner core 111 and an outer core 112, which are concentrically formed. The shaft 200 is inserted into the hollow hole 113 of the inner core 111, A plurality of magnets 130 are radially embedded in the outer core 112 and a fixing plate 120 for fixing the inner core 111 and the outer core 112 is mounted on both ends of the core 110 .

The inner fixing plate 121 and the outer fixing plate 122 are concentrically disposed on the fixing plate 120. The inner fixing plate 121 and the outer fixing plate 122 are connected to each other by a plurality of connections Are fixed to each other by a member (125).

A plurality of slots 124 are radially formed in the external fixing plate 122 so that the magnets 130 can be embedded.

The slot 124 is open toward the inner fixing plate 121 and is disposed on the outer circumference of the inner fixing plate 121 so as not to be separated through a space in which the magnet 130 embedded in the slot 124 is opened. A plurality of protrusions 126 are formed for fixing the protrusions 130.

The core 110 and the fixing plate 121 use S18.

In another embodiment, the plurality of cores 110 may be stacked, and a fixing plate 120 may be mounted between the stacked cores 110 to fix the stacked cores 110.

Further, the outer core 112 is formed by a combination of a plurality of split pieces divided into an arc.

In addition, a space portion 114 spaced apart by a predetermined distance is formed between the split pieces, a magnet 130 is mounted in the space portion 114, and a locking protrusion 115 protruding in the circumferential direction is formed at the end portion of the split piece .

After the outer core 112 is coupled with the inner core 111, the magnet 130 is prevented from being released to the outside by centrifugal force when the shaft is rotated by the shaft 200.

Meanwhile, the magnets 130 use ferrite magnets.

7 is a perspective view of a rotor of a spoke type motor according to the present invention.

7, the rotor 100 of the spoke type motor of the present invention has a shaft 200 inserted into a center portion of a hollow core 110, and a plurality of magnets (not shown) 130 are radially embedded in the rotor 100. The rotor 100 combines the core 110 and the shaft 200, and then inserts the same into the rotor.

The shaft 200 fastened to the inner core 111, the outer core 112 and the inner core 111 and the plurality of magnets 130 embedded in the outer core 112 are fastened together by inserter molding, That is, the rotor 100 has the molding part 140 formed on the surface of the core 110 by inserter molding after the core 110 and the shaft 200 are coupled.

8 is a view showing a manufacturing process of the rotor of the spoke type motor of the present invention.

As shown in FIG. 8, the rotor 100 of the spot-type motor of the present invention includes a first step of bonding a disk-shaped fixing plate 120 to upper and lower ends of the core 110; A step (2) of inserting and mounting the shaft (200) through the hollow holes (113, 123) formed in the core (110) and the fixing plate (120); And inserting the magnet (130) through the slot (124) of the fixing plate (120).

That is, in a method of manufacturing a rotor of a spoke type motor in which a shaft 200 is inserted into a center portion of a hollow core 110 and a plurality of magnets 116 are embedded radially around the shaft 200 In the first step, a disk-shaped fixing plate 120 is bonded to the upper and lower ends of the core 110.

As a second step, the shaft 200 is inserted and inserted through the hollow holes 113 and 123 formed in the core 110 and the fixing plate 120.

Further, as a three step process, the magnet 130 is inserted through the slot 124 of the fixing plate 120

When the plurality of cores 110 are formed in step 1, the core 110 is laminated, and a disk-shaped fixing plate 120 is bonded between the upper and lower ends of the core 110 and the core 110 do.

After the third step, the core 110, the shaft 200 fastened to the core 110, and the plurality of magnets 130 embedded in the core 100 are fastened to each other by inserter molding A step is further added to firmly fix the core 110, the shaft 200 fastened to the core 110, and the plurality of magnets 130 embedded in the core 100.

That is, since the rotor 100 of the present invention designed to reduce leakage of magnetic flux has a small physical coupling or a constrained coupling structure, the mechanical rigidity is naturally reduced.

Therefore, inserter molding has compensated for insufficient mechanical rigidity.

Synthetic resins used for inserting molding use PA or nylon in consideration of price and injection conditions. More specifically, PA66 GF30% or NYLON 66G should be used.

Fig. 9 is an analysis chart of the core shape mounted on the spot-type motor of the present invention.

As shown in FIG. 9, the core 110 is formed by interdigitating an arc-shaped divided piece and a space portion 114 into which the magnet is inserted along the circumferential direction. The thickness of the connecting member is set to 1.0 mm, And the angle between the center of the tooth width and the center of the space portion 114 into which the magnet 130 is inserted is designed to be 10 to 18 degrees.

The distance from the center of the core 110 to the outer periphery of the inner core 111 or the radius of the inner core 111 is 9.5 mm and the space portion 114 in which the magnet 130 is inserted from the center of the core 110 , That is, the distance from the engaging protrusion 115 to the end portion is 25 mm.

It is designed by deducing optimal dimensions by repeated experiments.

When the fixing plate 120 is mounted between the upper and lower ends of the core 110 and the core 110 and the plurality of cores 110 are stacked, the thickness of the core 110 is 33 mm, ) Was designed to have a thickness of 1 mm.

10 is a magnetic flux flow chart according to the thickness variation of the core width.

In order to confirm the correlation of the magnetic flux according to the thickness of the core 110, experiments were conducted under the following conditions.

NO division RMS BEMF (V / s / turns / m) Remarks One Dimension width: 1.5mm 0.900e-3 - 2 1.0 mm 1.018e-3 13% higher than 1 3 Diameter: 0.5mm 1.091e-3 7% increase compared to 2

As can be seen from Table 1, when the tooth width is 1.5 mm, 1.0 mm, and 0.5 mm, the back electromotive force increases as the tooth width becomes thinner.

FIG. 11 shows data obtained by measuring the cogging torque according to the shape of the core mounted on the conventional spot-type motor, FIG. 12 shows data obtained by measuring the cogging torque according to the shape of the core mounted on the spot- And FIG. 13 is a graph showing a measurement of a cogging torque according to the shape of a core mounted on the spot-type motor of the present invention.

For reference, cogging is a phenomenon that occurs as a magnetic field imbalance in a generator motor, and it refers to a phenomenon in which a generator or a shaft of the motor is not smoothly turned when it is rotated, and is unevenly rotated while taking a 'chin'.

Cogging Torque refers to the difference between the largest and smallest change in coke when turning the generator or motor shaft at low rpm.

The rotor of the spoke type motor, which is easy to fasten the shaft, forms a serration in the hollow hole of the core so that the shaft can be forced into the core, so that the core and the shaft are easily fastened, And the like.

100. Rotor
110. Core 111. Internal core 112. External core
113. hollow hole 114. space part 115. hooking jaw
120. Fixing plate 121. Inner fixing plate 122. External fixing plate
123. hollow hole 124. slot 125. connecting member
126. Projections
140. Molding part
130. Magnets
200. Shaft

Claims (3)

A shaft 200 is inserted into a central portion of the hollow core 110 and a plurality of magnets 130 are radially embedded around the shaft 200 to form a hollow hole 113 are serrated on the inner periphery of the spool type motor so that the shaft to which the shaft 200 is inserted can be easily fastened,
The core 110 is composed of an inner core 111 and an outer core 112 which are concentric with each other and a plurality of magnets 130 are radially embedded in the outer core 112, Shaped fixing plate 120 for fixing the inner core 111 and the outer core 112,
The inner fixing plate 121 and the outer fixing plate 122 are concentrically disposed with respect to the fixing plate 120. The inner fixing plate 121 and the outer fixing plate 122 are connected by a plurality of connecting members 125 formed along the circumferential direction And a plurality of slots 124 are radially formed in the external fixing plate 122 so that the magnets 130 can be embedded.
A plurality of the cores 110 are stacked, and a fixing plate 120 is mounted between the stacked cores 110 to fix the stacked cores 110,
The slot 124 is opened toward the inner fixed plate 121 and the magnet 130 is mounted on the outer circumference of the inner fixed plate 121 so as not to be separated through the space in which the magnet 130 embedded in the slot 124 is opened. A plurality of protrusions 126 are formed for fixing the protrusions 126,
The outer core 112 is formed by a combination of a plurality of split pieces divided in an arc shape. A space portion 114 is formed at a predetermined interval between the split pieces. A magnet 130 is inserted into the space portion 114 And the outer core 112 is coupled to the inner core 111. The outer core 112 is coupled to the inner core 111 by the centrifugal force of the shaft 200, (130) is not released to the outside,
The shaft 200 fastened to the inner core 111, the outer core 112 and the inner core 111 and the plurality of magnets 130 embedded in the outer core 112 are fastened together by inserter molding,
The thickness of the connecting member 125 is 1.0 mm, the angle between the tooth widths is 36 degrees, and the center of the tooth width and the center of the space portion 114 into which the magnet 130 is inserted The angle was made 10 to 18 °,
A radius of the internal core 111 which is a distance from the center of the core 110 to the outer periphery of the internal core 111 is 9.5 mm and a space 114 in which the magnet 130 is inserted from the center of the core 110, The distance from the lower end of the engaging projection 115 to the end of the engaging projection 115 is 25 mm,
When the fixing plate 120 is mounted between the upper and lower ends of the core 110 and the core 110 and the plurality of cores 110 are laminated, the thickness of the core 110 is 33 mm, The rotor of the spoke-type motor is easy to be fastened to the shaft.

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