KR101398461B1 - Electric motor - Google Patents

Abstract

The present invention relates to an electric motor including a stator and a rotor including an inner core having a shaft, a yoke coupled to the shaft, and a plurality of pawls projecting radially in a predetermined width in the yoke, An outer core coupled to the outer side of the inner core so as to be in contact with the plurality of pawls at the same time, and a rotor coil provided on each pole of the inner core before the outer core is coupled. Thereby, it is possible to suppress the occurrence of twisting of the rotor coil at the time of winding the rotor coil, thereby increasing the drop rate of the rotor coil.

Description

ELECTRIC MOTOR

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor, and more particularly, to an electric motor capable of suppressing occurrence of twisting of a rotor coil at the time of winding a rotor coil.

As is well known, an electric motor is a rotating machine that converts electric energy into mechanical energy.

Fig. 1 is a sectional view of a conventional electric motor, and Fig. 2 is a sectional view of the rotor of Fig.

As shown in Fig. 1, the electric motor includes a stator 20 and a rotor 30 rotatably arranged with respect to the stator 20.

A frame or case 10 (hereinafter referred to as "case 10") is provided outside the stator 20.

The case 10 is provided with a bearing 12 for rotatably supporting the rotor 30.

The stator 20 includes a stator core 22 and a stator coil 24 that is wound around the stator core 22.

The rotor 30 includes a shaft 31, a rotor core 41 coupled to the shaft 31, and a rotor coil 51 wound around the rotor core 41.

The rotor core 41 includes a hub 43 to which the shaft 31 is coupled and a plurality of pawls 45 projecting from the hub 43 along the radial direction.

The pawls 45 are spaced at regular intervals along the circumferential direction.

A slot 44 is formed between the pawls 45 adjacent to each other.

The rotor coils 51 are wound around the respective pawls 45 a plurality of times.

The shaft 31 is provided with a power supply unit 35 for applying power to the rotor coil 51.

The power supply unit 35 includes a commutator or a slip ring 36 coupled to the shaft 31 and a brush 37 electrically connected to the commutator or the slip ring 36.

However, in such a conventional motor, the contact area of the rotor coil 51 with the air is relatively small during operation, so that the heat radiation becomes insufficient and the temperature can rise. If the temperature of the rotor coil 51 rises excessively, the output of the motor may be lowered.

A so-called "coil end or end turn" protruding in the axial direction from both ends of the rotor core 41 is radially pulled by the centrifugal force when the rotor 30 rotates Disconnection may occur.

The rotor coil 51 is wound using a gap between the pawls 45 and the pawl 45 so that the amount of the coil relative to the slot 44 ) To a certain level (for example, 75%) or more, and thus there is a limit in increasing the output of the electric motor.

JP 2009-284579 A (Released on December 3, 2009) JP 2006-314155 A (Released November 16, 2006)

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an electric motor capable of suppressing occurrence of twisting of the rotor coil during winding of the rotor coil, thereby increasing the drop rate of the rotor coil.

Another object of the present invention is to provide an electric motor capable of suppressing twisting of the rotor coil during winding of the rotor coil and suppressing vibration and noise of the rotor core during operation.

Another object of the present invention is to provide an electric motor capable of suppressing twisting of the rotor coil and suppressing occurrence of disconnection of the rotor coil due to centrifugal force during rotation.

In order to achieve the above object, the present invention provides a stator comprising: a stator; And a rotor rotatably disposed relative to the stator, the rotor comprising: a shaft; An inner core having a yoke coupled to the shaft and a plurality of pawls projecting radially in a predetermined width in the yoke; An outer core coupled to the plurality of pawls at the same time in contact with the outer side of the inner core; And a rotor coil provided on each pole of the inner core before the outer core is coupled.

Here, the coil supporting member may be provided on the inner core to support the rotor coil without detaching the rotor coil along the radial direction when the rotor is rotated.

A coupling protrusion protruding from one of mutual contact surfaces of the inner core and the outer core; And a coupling protrusion receiving portion formed on the other one of the coupling protrusion to receive the coupling protrusion.

The rotor coil may be configured to be radially coupled to each of the pawls after being wound around the pole receiving hole so that the pawl can be received in the center thereof.

The rotor coil may be formed so that the width of the center side end of the inner core is smaller along the insertion direction, and the number of the rotor coils may be equal to the number of the pawls.

The external core may include a plurality of pole coupling portions to which the respective pawls are coupled and a magnetic suppression portion whose thickness is reduced so that the movement of the magnetic field lines is suppressed at the boundary of the pole coupling portions adjacent to each other along the circumferential direction.

The outer core includes a plurality of pole coupling portions to which the respective pawls are coupled. The outer core has a circular outer surface and a pole coupling portion corresponding to the number of the pawls on the inner surface. The inner surface has a circular or polygonal .

When the inner surface of the outer core has a polygonal cross-section, the thicker and thicker portions may be formed in the same number as the number of the pawls.

The rotor coil may be composed of a copper wire having a rectangular cross section.

And a reinforcing member which is formed in a thread or wire shape and is wound on the outer surface of the outer core.

And a reinforcing member which is formed in a thread or wire shape and is wound on the outer surface of the coil supporting member.

And a reinforcing member that is formed in a thread or wire shape and is wound on the outer surface of the coil supporting member and the outer core.

As described above, according to an embodiment of the present invention, the rotor includes the inner core and the outer core, and the inner core includes a plurality of pawls protruding in a predetermined width around the yoke and the yoke, It is possible to suppress the twisting of the rotor coil at the time of winding of the rotor coil, thereby making it possible to use the rectangular copper wire, thereby increasing the drop rate of the rotor coil. Whereby the output of the electric motor can be improved.

Further, the inner core is formed to have a plurality of pawls protruding in a predetermined width around the yoke and the yoke, and the outer core is configured to be coupled to the outer periphery of the yoke and the yoke, thereby suppressing vibration and noise generation of the pawl during operation.

In addition, by providing the rotor coil support member that supports the rotor core at both ends of the inner core so that the rotor coil can be prevented from radially deviating from the rotor core when the rotor rotates, disconnection of the rotor coil due to centrifugal force can be suppressed.

The external core includes a plurality of pole coupling portions to which the respective pawls are coupled and a magnetic suppression portion whose thickness is reduced so that the movement of the magnetic field lines is suppressed is provided at the boundary of the pole coupling portions adjacent to each other along the circumferential direction, The coupling strength can be increased and the magnetic leakage can be suppressed, so that the output can be improved.

The outer core has a circular outer surface and a pole coupling portion corresponding to the number of the pawls on the inner surface. The inner surface has a circular or polygonal cross-sectional shape, so that the coupling strength is increased during coupling with the inner core The life span can be prolonged.

1 is a cross-sectional view of a conventional electric motor,
Figure 2 is a cross-sectional view of the rotor of Figure 1,
3 is a cross-sectional view of an electric motor according to an embodiment of the present invention,
4 is an enlarged view of the main part of Fig. 3,
Fig. 5 is a perspective view of the rotor of Fig. 3,
Fig. 6 is an exploded perspective view of the rotor of Fig. 5,
Figure 7 is a front view of the rotor of Figure 3,
8 is an enlarged view of the main part of Fig. 7,
Fig. 9 is an enlarged view of the rotor coil of Fig. 7,
10 is a modification of the rotor of Fig. 3,
Fig. 11 is a modification of the rotor of Fig. 3,
12 is a sectional view of a rotor according to another embodiment of the present invention,
13 is an exploded perspective view of the rotor of Fig. 12,
14 is a modification of the rotor coil support member of Fig.

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

3 and 4, an electric motor according to an embodiment of the present invention includes a stator 120; And a rotor (140) rotatably disposed relative to the stator (120), the rotor (140) comprising: a shaft (141); An inner core 151 having a yoke 154 coupled to the shaft 141 and a plurality of pawls 157 protruding in a predetermined width in a radial direction of the yoke 154; An outer core (161) coupled to the outside of the inner core (151) so as to be in contact with the plurality of pawls (157) at the same time; And a rotor coil 180 provided on each pole 157 of the inner core 151 before the outer core 161 is coupled.

The electric motor of the present embodiment may include a case 110 forming a housing space therein.

The stator 120 may be provided inside the case 110.

The case 110 may have a shape corresponding to the shape of the outer surface of the stator 120, for example.

The case 110 may have a cylindrical shape.

Both ends of the case 110 may be formed to be open.

Brackets 115 may be provided at both ends of the case 110. The brackets 115 may be detachably coupled to both ends of the case 110, respectively.

The bracket 115 may be provided with a bearing 117 for rotatably supporting the rotor 140.

The stator 120 may include a stator core 121 and a stator coil 131 wound around the stator core 121.

The stator core 121 may be provided with a rotor accommodation space 124 in which the rotor 140 is rotatably received.

The stator core 121 may include a plurality of slots 126 and teeth 127 formed around the rotor accommodating space 124.

The rotor 140 includes a shaft 141, a rotor core 150 having an outer core 161 and an inner core 151 separated from each other along the radial direction, And a rotor coil 180 provided on the rotor 150. [

More specifically, the inner core 151 includes a cylindrical yoke 154 and a plurality of pawls 157 protruding in the radial direction from the outer circumferential surface of the yoke 154, And the inner surface thereof may be in contact with the end of the pole 157 at the same time so as to have a thin thickness so as to perform a so-called "polesch function ". Here, the pole piece is a portion formed by extending the magnetic path in the circumferential direction at the end of each pole 157.

The shaft 141 can be rotatably supported on both sides by the bearing 117.

A power supply 145 for supplying power to the rotor coil 180 may be provided on one side of the shaft 141.

The power supply unit 145 may include a slip ring 146 mounted on the shaft 141 and a brush 147 electrically connected to the slip ring 146.

More specifically, as shown in FIGS. 5 to 7, the rotor 140 includes a shaft 141; An inner core 151 having a yoke 154 coupled to the shaft 141 and a plurality of pawls 157 protruding in a predetermined width in a radial direction of the yoke 154; An outer core (161) coupled to the outside of the inner core (151) so as to be in contact with the plurality of pawls (157) at the same time; And a rotor coil 180 provided on each pole 157 of the inner core 151 before the outer core 161 is coupled. The yoke 154 and the pole 157 are formed integrally with each other so that the yoke (not shown) and the pole (not shown) are separated from each other and coupled to each other, Vibration and noise generation of the pawls 157 during operation can be suppressed as compared with the conventional structure (configuration) in which the vibration of the pawl occurs during operation due to clearance and / or unstable support.

The internal core 151 may be formed by, for example, insulative lamination of a plurality of electrical steel plates 152.

The outer core 161 may be formed by inserting a plurality of electrical steel plates 162, for example.

The inner core 151 may be provided with a shaft hole 155 through which the shaft 141 is inserted.

The inner core 151 includes a cylindrical yoke 154 having a predetermined outer diameter and a plurality of pawls 157 protruding radially from the outer surface of the yoke 154 and spaced apart in the circumferential direction, As shown in FIG.

Each of the electric steel plates 152 of the inner core 151 may include the yoke 154, the shaft hole 155, and the pole 157, respectively.

Each of the pawls 157 may protrude radially from the outer surface of the yoke 154 and have a predetermined width (a predetermined width). Accordingly, the rotor coil 180 can be inserted and coupled outside the respective pawls 157 along the radial direction.

Each of the pawls 157 may be composed of eight, for example.

Slots 159 may be formed on both sides of each pole 157.

The inner core 151 may be provided with a rotor coil 180.

More specifically, a rotor coil 180 may be provided around each pole 157 of the inner core 151.

The rotor coil 180 may include a plurality of coil portions 182 provided around the respective pawls 157.

The coil part 182 may have different magnetic poles (N poles, S poles) along the circumferential direction of the rotor 140.

Each of the coil portions 182 may be wound in opposite directions (for example, rightward direction and leftward direction) so as to have different magnetic poles.

The coil portion 182 may be composed of eight poles.

The number of the rotor coils 180 (coil portions 182) may be the same as the number of the pawls 157.

The coil portions 182 may be connected to each other in series.

Each of the coil sections 182 may be coupled to the respective pawls 157 before the outer core 161 and the inner core 151 are coupled.

6, 7, and 9, each of the coil portions 182 has a pole receiving hole 186 formed therein so that the pole 157 can be received in the center thereof, And may be coupled to the respective pawls 157 along the radial direction. According to this configuration, since each of the coil portions 182 is not directly wound around the respective pawls 157, it is easy to wind the coil so that the twist of the coil conductor (wire) can be reduced. As a result, the rectangular cross section copper wire 185 can be used as the coil conductor, and the dot ratio can be remarkably increased. Thus, the output of the electric motor of the present embodiment can be remarkably enhanced. The space factor is the sum of the cross sectional areas (the sum of the cross sectional areas) of the conductor (rectangular cross section copper wire 185) of the rotor coil 180 with respect to the cross sectional area of the slot 159 of the rotor core 150, (Ratio) of the total amount of water.

An insulating member 187 may be provided in each of the coil portions 182.

The insulating member 187 may be formed, for example, in the shape of a rectangular tube.

Each of the coil parts 182 may be wound around each of the insulating members 187.

The coil portions 182 may be wound without an insulating member 187 and then inserted into the respective coil portions 182 before the respective poles 157 are coupled . In this case, an insulating sheet (not shown) may be realized by winding a rectangular plate-shaped sheet around each of the pawls 157.

The rotor coil 180 may be formed such that the width w2 of the center side end portion (yoke side end portion) of the inner core 151 is smaller than the width w1 of the outer side end portion along the inserting direction. Thus, interference between the respective coil parts 182 can be suppressed in the end regions of the respective pawls 157 on the side of the yoke 154 when the coil parts 182 are coupled.

Each of the coil sections 182 may have a coil end 183 protruding from both ends of the inner core 151 along the axial direction when engaged with the pawl 157.

The outer core 161 may be coupled to the outer side of the inner core 151.

The outer core 161 may be coupled to the inner core 151 after the rotor coil 180 is coupled to each pole 157 of the inner core 151.

The outer core 161 may be, for example, a cylindrical shape having open sides on both sides.

The inner core 151 may be inserted into the outer core 161 along the axial direction.

The outer core 161 may include a plurality of pole coupling portions 165 to which the respective pawls 157 are coupled.

The outer core 161 may have a circular outer surface 163a and a pole coupling part 165 corresponding to the number of the pawls 157 on the inner surface 163b.

In the outer core 161, for example, the inner surface 163b may have a circular or polygonal cross-sectional shape.

In the present embodiment, the outer core 161 is configured such that the outer surface 163a is circular and the inner surface 163b has a polygonal cross-section.

The outer core 161 may be configured to have a thick portion 168 having a relatively large thickness t1 and a thin portion 169 having a thickness t2 that is thinner than the thick portion 168. [

The thicker portion 168 and the thinner portion 169 may be formed in the same number as the number of the pawls 157, respectively. In the present embodiment, eight pawls 157 are formed, so that the thick portion 168 and the thin portion 169 may be formed by eight pawls. For example, the thick portion 168 may be configured to gradually decrease in thickness as it moves from the central region to both sides, and the thin portion 169 may be formed in the boundary region of the thick portion 168.

The thin portion 169 may be formed to have a thickness t2 that is small enough to saturate the magnetic flux lines during operation. The thin portion 169 can be referred to as "magnetic suppression portion 169" in that the thickness thereof is reduced to such an extent that the movement of the magnetic force lines can be suppressed. According to such a configuration, since each of the thin portions 169 forms a magnetic barrier, the respective thick portions 168 can be separated from each other magnetically. Thus, magnetic leakage through the thin-wall portion 169 (or the magnetic restraining portion 169) can be suppressed.

The rotor core 150 includes a coupling protrusion 158 protruding from one of the mutual contact surfaces of the inner core 151 and the outer core 161 and a coupling protrusion 158 formed on the other one of the coupling protrusions 158 to receive the coupling protrusion 158 And an engaging projection receiving portion 170. [

More specifically, as shown in FIGS. 7 and 8, at the end of each of the pawls 157, a coupling protrusion 158 protruding outward along the radial direction may be provided.

The engaging projection 158 may be configured to have, for example, a rectangular cross section.

The outer core 161 may be provided with a coupling projection receiving portion 170 to receive the coupling projections 158.

The engaging projection receiving portion 170 may be configured to have a rectangular cross section so as to be in surface contact with the engaging projection 158, for example.

The coupling protrusion receiving portions 170 may be formed on the pole coupling portions 165, respectively.

Here, the coupling projections 158, the coupling projection receiving portions 170, the coupling portions 165, the thick portions 168 and the thin portions 169 are symmetrical with respect to the center line of the respective pawls 157 Respectively.

The rotor 140 includes a reinforcing member 190 disposed on the outer side of the rotor coil 180 and supporting the rotor coil 180 in a radially outward direction when the rotor 140 rotates, .

The reinforcing member 190 may have a thread or wire shape and may be wound several times so as to be in contact with the outer surface of the rotor coil 180.

10, the rotor 140 has a plurality of outer-wound portions (not shown) on the outer surface of the coil end 183 of the rotor coil 180 protruding outward from both ends of the rotor core 150 A reinforcing member 190 may be provided. Accordingly, when the rotor 140 rotates, the coil ends 183 can be supported against the centrifugal force, so that the coil ends 183 can be prevented from deviating outward. Thereby, occurrence of disconnection of the rotor coil 180 can be suppressed.

11, the rotor 140 includes an outer surface of the coil end 183 of the rotor coil 180 protruded from both ends of the rotor core 150 and an outer surface of the outer core 161 And a reinforcing member 190 wound several times. The reinforcement member 190 on the outer surface of the outer core 161 can further reduce the magnetic leakage by making the thickness of the thin portion 169 thinner. Can be rotated at a high speed.

The reinforcing member 190 may be formed of a glass fiber 192 having a higher specific strength than iron.

With this configuration, the number of coil parts 182 corresponding to the number of the pawls 157 can be provided. Each of the coil sections 182 is formed to have a pole receiving hole 186 so that the pole 157 can be received at the center by using a copper wire 185 having a rectangular cross section, Occurrence can be suppressed and the dot rate can be enhanced. More specifically, conventionally, twisting of a conductor is inevitably caused by winding work while rotating a copper wire around a pole using a gap between the poles (or poles), but in the present embodiment, Since the copper wire 185 is not wound, it is possible to wind the coil portion 182 without twisting the copper wire 185. As a result, as shown in FIG. 9, it is possible to suppress the occurrence of a gap between the wound copper wires 185, so that the drop rate can be remarkably increased and the output of the electric motor can be increased accordingly.

When the winding of each coil section 182 is completed, the coil sections 182 can be inserted radially outward of the respective poles 157 of the internal core 151. The coil sections 182 may be connected in series with each other, for example.

The outer core 161 may be coupled to the outer side of the inner core 151 along the axial direction when coupling and connection of the coil portions 182 are completed. At this time, the engaging protrusions 158 are inserted into the engaging protrusion receiving portions 170 and are slidably engaged with each other.

When the operation is started, power can be supplied to the stator 120 and the rotor 140, respectively.

A magnetic field is formed by the stator coil 131 and the rotor 140 is rotated about the center of the shaft 141 by the interaction of the magnetic field with the respective pawls 157 magnetized by the rotor coil 180. [ As shown in FIG.

Hereinafter, another embodiment of the present invention will be described with reference to Figs. 12 to 14. Fig.

Like reference numerals are used to designate like or corresponding parts to those shown and described, and redundant description of some components may be omitted.

12, an electric motor according to another embodiment of the present invention includes a stator 120; And a rotor (140) rotatably disposed relative to the stator (120), the rotor (140) comprising: a shaft (141); An inner core 151 having a yoke 154 coupled to the shaft 141 and a plurality of pawls 157 protruding in a predetermined width in a radial direction of the yoke 154; An outer core (161) coupled to the outside of the inner core (151) so as to be in contact with the plurality of pawls (157) at the same time; And a rotor coil 180 provided on each pole 157 of the inner core 151 before the outer core 161 is coupled.

A case 110 may be provided outside the stator 120.

The stator 120 may include a stator core 121 and a stator coil 131.

The rotor 140 includes a shaft 141, a yoke 154 coupled to the shaft 141, and a plurality of pawls 157 protruding from the yoke 154 in a radially predetermined width An outer core 161 connected to the plurality of pawls 157 at the same time so as to be in contact with the outer side of the inner core 151 at the same time as the inner core 151, And a rotor coil 180 provided on each of the pawls 157 of the inner core 151. The rotor coil 180 is disposed at both ends of the inner core 151 and rotates in a radial direction And a rotor coil supporting member 210 for supporting the rotor coil 180 so as not to be detached.

The rotor coil 180 may include a plurality of coil portions 182 provided around the respective pawls 157.

The coil portion 182 of the rotor coil 180 may be formed in the same number as the number of the pawls 157 (for example, eight).

The coil sections 182 may be configured such that different magnetic poles are alternately arranged along the circumferential direction.

Each of the coil parts 182 may be coupled to and connected to the respective pawls 157 before the outer core 161 and the inner core 151 are coupled.

When the coupling between the inner core 151 and the rotor coil 180 is completed, the outer core 161 may be coupled to the outer side of the inner core 151.

A reinforcing member 190 having a thread or a wire shape on the outer surface of the outer core 161 and wound on the outer surface of the outer core 161 a plurality of times may be provided. As a result, the thickness t2 of the thin portion 169 of the outer core 161 can be reduced, and the magnetic leakage can be further suppressed. Also, the strength of the outer core 161 is improved, and the rotor 140 can be rotated at a high speed.

The reinforcing member 190 may be embodied as a glass fiber 192. This makes it possible to effectively increase the strength without significantly increasing the weight.

The rotor 140 of the present embodiment includes a rotor coil supporting member 210 which is provided in the inner core 151 and supports the rotor coil 180 without detaching the rotor coil 180 along the radial direction during rotation, .

The rotor coil support member 210 may be axially coupled to both ends of the inner core 151 after the inner core 151 and the outer core 161 are coupled.

13, the rotor coil support member 210 includes a hub 212 coupled to the shaft 141, and a rotor 212 mounted around the hub 212 to rotate the rotor coil 180 And a coil end coupling portion 215 coupled to each coil end 183 of the coil end coupling portion 215.

A shaft hole 213 may be formed in the hub 212 of the rotor coil support member 210 so that the shaft 141 can be inserted.

The coil end coupling portion 215 may include an outer wall portion 216 provided on the outer side of the coil portions 182 along the radial direction of the inner core 151. Thus, the coil end 183 can be supported against the centrifugal force acting on the coil end 183 when the rotor 140 rotates. According to this, it is possible to suppress the occurrence of disconnection of the rotor coil 180 due to the action of the centrifugal force.

The outer wall portion 216 may be formed in a ring shape, for example.

The coil end coupling portion 215 may be provided with a through hole 217 to expose a region of the coil end 183.

14, the rotor 140 includes a coil end receiving portion 232 for receiving the coil end 183 of the rotor coil 180 (the coil portion 182) And a rotor coil support member 230 having a support plate 235 inserted between the coil sections 182.

Each coil end receiving portion 232 may have a coil end receiving space 233 in which the coil end 183 is received. In this embodiment, the coil end accommodating space 233 is configured to have an arcuate cross section, but the shape thereof may be configured to correspond to the shape of the coil end 183.

The support plate 235 may be connected to two adjacent coil end receivers 232 at the same time.

Each of the support plates 235 may be disposed radially around the shaft 141.

The support plate 235 may have a length of about half (or half or less) of the axial length of the internal core 151. Accordingly, they can be coupled axially on both sides of the inner core 151, respectively.

With this configuration, a plurality of coil portions 182 of the rotor coil 180 can be formed by using the copper wire 185 having a rectangular cross section.

Each of the coil sections 182 may be inserted radially outside the respective pawls 157 of the inner core 151.

The outer core 161 may be coupled along the axial direction of the inner core 151 when the coupling between the inner core 151 and the rotor coil 180 is completed.

The reinforcing member 190 may be wound on the outer surface of the outer core 161 a plurality of times when the coupling between the inner core 151 and the outer core 161 is completed. Accordingly, the strength of the outer core 161 is reinforced, and the rotor 140 can be rotated at a high speed.

When the coupling of the inner core 151 and the outer core 161 is completed, the rotor coil supporting members 210 and 230 may be coupled to both ends of the inner core 151 along the axial direction of the inner core 151. Accordingly, the rotor coil 180 can be prevented from being detached from the rotor core 150 along the radial direction due to centrifugal force when the rotor 140 rotates. Thus, the occurrence of disconnection of the rotor coil 180 due to the centrifugal force when the rotor 140 rotates can be suppressed.

The foregoing has been shown and described with respect to specific embodiments of the invention. However, the present invention may be embodied in various forms without departing from the spirit or essential characteristics thereof, so that the above-described embodiments should not be limited by the details of the detailed description.

Further, even when the embodiments not listed in the detailed description have been described, it should be interpreted broadly within the scope of the technical idea defined in the appended claims. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

110: Case 115: Bracket
120: stator 121: stator core
124: rotor accommodating space 126: slot
127: Teeth 131: Stator coil
140: rotor 141: shaft
145: Power supply unit 146: Slip ring
147: Brush 150: Rotor core
151: internal core 154: yoke
155: shaft ball 157: pole
158: engaging projection 161: outer core
165: pole coupling portion 168: thick portion
169: thin section 170: engaging projection receiving section
180: rotor coil 182: coil part
183: coil end 185: copper wire
186: pole receiving hole 187: insulating member
190: reinforcing member 192: glass fiber
210: coil support member 212: hub
215: coil end coupling portion 216: outer wall portion
217: Through-hole

Claims (10)

Stator; And
And a rotor rotatably disposed with respect to the stator,
The rotor comprising: a shaft;
An inner core having a yoke coupled to the shaft and a plurality of pawls projecting radially in a predetermined width in the yoke;
An outer core coupled to the plurality of pawls at the same time in contact with the outer side of the inner core;
A rotor coil provided on each pole of the inner core before the outer core is coupled; And
And a coil supporting member provided on the inner core and supporting the rotor coil without detaching the rotor coil along a radial direction when the rotor is rotated. delete The method according to claim 1,
A coupling protrusion protruding from one of mutual contact surfaces of the inner core and the outer core; And an engaging projection receiving portion formed on the other one of the engaging projections to receive the engaging projection. The method according to claim 1,
Wherein the rotor coils are coupled to the respective poles along the radial direction after the pole coils are wound so that the poles can be received in the center thereof. 5. The method of claim 4,
Wherein the rotor coil is formed such that a width of a center side end portion of the inner core is smaller along the insertion direction, and the number of the rotor coils is equal to the number of the pawls. The method according to claim 1,
Wherein the outer core has a plurality of pole coupling portions to which the respective pawls are coupled,
And a magnetic suppressing portion whose thickness is reduced so that the movement of the magnetic force lines is suppressed at the boundary of the pole coupling portions adjacent to each other along the circumferential direction. The method according to claim 1,
Wherein the outer core has a plurality of pole coupling portions to which the respective pawls are coupled,
Wherein the outer core has a circular outer surface and a pole coupling portion corresponding to the number of the pawls on the inner surface, and the inner surface has a circular or polygonal cross-sectional shape. 8. The method of claim 7,
Wherein when the inner core has a polygonal cross-section, the thicker portion is thicker than the thicker portion and the thinner portion is thinner than the thicker portion. 9. The method according to any one of claims 1 to 8,
Wherein the rotor coil is a copper wire having a rectangular cross section. 10. The method of claim 9,
And a reinforcing member which is formed in a thread or wire shape and is wound on the outer surface of the outer core.

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