CN108028555A

CN108028555A - Motor and motor control circuit

Info

Publication number: CN108028555A
Application number: CN201680054353.7A
Authority: CN
Inventors: 龙田利树; 向井胜久
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2015-10-22
Filing date: 2016-10-20
Publication date: 2018-05-11
Anticipated expiration: 2036-10-20
Also published as: EP3317945A4; JP2018042445A; CN108028555B; EP3317945A1

Abstract

A kind of motor, is formed by stacking multiple stator components, and the insulator between stator component is not required.Stator includes multiple stator components.Stator component includes the multiple pawl poles formed along the circumferential direction of stator component and the circumferentially coil of direction winding.The coil of stator component adjacent each other is wound along different directions.In mutually adjacent stator component, another the pawl pole in the pawl pole and stator component of one in stator component is relative to each other and is arranged to identical polarity.

Description

Motor and motor control circuit

Technical Field

Embodiments of the present disclosure relate to motors, such as single phase claw pole motors, and motor control circuits.

Background

A general single-phase claw-pole motor, as shown in japanese patent laid-open No.2013-104442, includes a stator and a rotor rotatably mounted in the stator. The stator includes: an upper core including a plurality of downward claw poles formed in a circumferential direction; a lower core including a plurality of upward claw poles formed along a circumferential direction; and a coil wound in a circumferential direction.

In more detail, the core and the coil are configured to alternately arrange upward claw poles and downward claw poles in a circumferential direction, and to insert the coil into the core.

However, for example, in the case where an inclination angle is formed at the stator in the axial direction, the stator may also be formed by stacking stator elements by combining the above-described core and coil in the axial direction.

In this case, taking the upper view of fig. 7 as an example, when one side of the contact surface between the upper stator element and the lower stator element is a north pole and the other side is a south pole, a short circuit occurs between these stator elements.

Thus, referring to the lower view of fig. 7 as an example, the stator elements are stacked with insulators interposed therebetween.

Disclosure of Invention

Technical problem

However, in the above configuration, the insulator interposed between the stator elements may become an obstacle to downsizing of the motor, or the manufacturing cost may be increased due to the insulator.

Technical scheme

According to one aspect of the present disclosure, a motor includes a stator and a rotor. The stator includes a plurality of stacked stator elements. Each of the stator elements may include a plurality of claw poles formed in a circumferential direction of the stator element and coils wound in the circumferential direction of the stator element, and the coils of mutually adjacent stator elements are wound in different directions. Also, in the mutually adjacent stator elements, the claw pole of one of the stator elements and the claw pole of the other of the stator elements are opposed to each other and arranged to have the same polarity.

In the motor configured as described above, since the coils of the stator elements adjacent to each other are wound in different directions, all the contact surfaces of the stator elements can become N-polarity or S-polarity, short circuit can be prevented without interposing an insulator between the stator elements, and in addition, the motor can be miniaturized in its axial direction while reducing material costs compared to a general motor.

Here, as shown in fig. 6, even when the coils of the mutually adjacent stator elements are wound in different directions, the mutually adjacent stator elements are configured such that one of the opposing claw poles becomes N-polarity and the other of the opposing claw poles is referred to as S-polarity, and directions of magnetic fluxes formed between the claw poles of each of the stator elements become opposite to each other. This cancels the magnetic fluxes, and reduces the output of the motor.

In contrast to this, in the motor configured as described above, since the mutually adjacent stator elements are configured such that the claw poles of one of the stator elements and the claw poles of the other of the stator elements are opposed to each other and have the same polarity, the direction of the magnetic flux formed between the claw poles of each of the stator elements becomes the same, and the output of the motor can be prevented from being lowered.

In mutually adjacent stator elements, a certain angle of inclination may be formed between mutually opposite claw poles.

The rotor may be one of a surface permanent magnet type, an inner permanent magnet type, and a spoke type.

In addition, there is another aspect as follows.

As described in japanese patent laid-open No.2009-005421, a general claw pole motor includes a plurality of claw poles formed in a circumferential direction and coils arranged along the claw poles.

In the claw pole motor, when a heat radiating member or a fan is installed to radiate heat generated at the coil, a recent demand for reduction in size of the motor cannot be satisfied, and material cost increases.

In the above, one or more of the inventors strongly and repeatedly considered a component that dissipates heat generated at the coil without installing an additional heat dissipating member.

The present invention can provide a claw pole motor capable of dissipating heat generated at a coil without installing a heat dissipating member, a fan, etc., as a result of strongly and repeatedly considering the above-described considerations.

That is, according to an aspect of the present disclosure, the claw pole motor may include a plurality of claw poles and coils. The claw pole motor may include a pair of support members supporting the claw pole, the coil being inserted into the pair of support members and forming a connection path between at least one of the pair of support members. The connection path connects a first opening formed at a portion opposite to the coil with a second opening formed at a portion not opposite to the coil.

According to the claw pole motor, since the support member includes the connection path that connects the first opening formed at the portion opposed to the coil and the second opening formed at the portion not opposed to the coil, the coil can be cooled using the air flowing into the connection path. Also, since the connection path is formed at the pair of support members into which the coil is inserted, the coil can be cooled without additionally installing a heat dissipation member, a fan, or the like.

A groove or a slit formed through a portion opposite to the coil and a portion not opposite to the coil may be a detailed example of the connection path.

To more positively cool the coil, each of the support members may include a plurality of such grooves.

As an example in which the grooves are formed at the support members, each of the support members may be formed in an annular plate shape, and the grooves may have a shape extending from a portion opposite to the coil to the outside in a diameter direction.

Also, as another example in which heat generated at the coil is effectively dissipated, the motor including the plurality of claw poles and the coil may include a pair of support members configured to support the claw poles and into which the coil is inserted. At least one of the support members may include a coil cooling through hole formed at a portion opposite to the coil.

In the above configuration, since the coil cooling through hole is formed at a portion opposite to the coil of the support member, ambient air may directly contact the coil through the coil cooling through hole, and the coil may be efficiently cooled.

In order to provide the mechanical strength of the support member having the large-area coil in contact with the air, the coil cooling through holes may be intermittently formed in the circumferential direction, and a reinforcing portion configured to reinforce the mechanical strength of the support member may be formed between mutually adjacent coil cooling through holes.

To reduce core loss, each of the support members may be a non-magnetic body.

In addition, there is another aspect as follows.

It has been described that a general claw pole motor as described in japanese patent laid-open No. 2009-.

In more detail, since the magnetic flux gradually increases from the top end to the bottom end of the claw pole, the claw pole is configured such that the steel plate at the substantially center in the circumferential direction is formed longer than the steel plates on both sides, so that the cross section of the claw pole further increases from the top end toward the bottom end.

However, the cross-section of the claw poles is configured to increase from the top end toward the bottom end only on a side of each of the claw poles next to the rotor. A side of each of the claw poles opposite the rotor is configured to have a cross section of a uniform size from the top end toward the bottom end. In the above structure, the magnetic flux passes more easily through the side opposite to the rotor than the side immediately adjacent to the rotor, and the magnetic flux density of the side immediately adjacent to the rotor is reduced in each of the claw poles, thereby actually reducing the efficiency of the motor.

Accordingly, to overcome the above limitations, it is an aspect of the present disclosure to provide an improved claw pole shape to increase the efficiency of a claw pole motor.

That is, according to an aspect of the present disclosure, the claw pole motor may include: a stator including upward claw poles and downward claw poles alternately formed in a circumferential direction; and a rotor disposed inside or outside the stator. Each of the claw poles may include a first magnetic pole element opposing the rotor and a second magnetic pole element magnetically connected with the first magnetic pole element. The coil is interposed between the first pole member and the second pole member. The second magnetic pole element of each of the upward and downward claw poles has a thickness that is thinner at its top end portion than at its bottom end portion.

In the claw-pole motor, since the second magnetic pole member located opposite to the rotor is configured such that the thickness of the top end portion is thinner than that of the bottom end portion, a larger magnetic flux can be concentrated on the first magnetic pole member than on the second magnetic pole member, and the efficiency of the rotor can be further improved compared to the conventional motor when the current flowing through the coil is at the same level.

However, as described above, the claw pole described in japanese patent laid-open No.2013-104442 has different lengths in the circumferential direction at substantially the center and on both sides thereof, and therefore, a plurality of types of steel plates are required, and the manufacturing process is complicated.

Therefore, the upward claw poles may be formed by stacking steel plates in the same shape (forming a u shape when viewed in the circumferential direction of the stator element) in the circumferential direction, and the downward magnetic poles may be shaped by stacking steel plates in the same shape (forming an n shape when viewed in the circumferential direction of the stator element) in the circumferential direction.

With the above configuration, the manufacturing process is not complicated, and the thickness of the top end portion of the second magnetic pole member of each of the claw poles is thinner than the thickness of the base end portion.

The first and second magnetic pole elements may be formed as separate members, and each of the first and second magnetic pole elements may be formed by stacking steel plates having the same shape in a circumferential direction of the stator element.

As described above, since each of the magnetic pole elements is formed as a separate member, the yield of manufacturing the magnetic pole element is improved as compared with the case where the magnetic pole elements are integrated.

In order to further improve the yield, each of the claw poles may further include a third magnetic pole element interposed between the bottom end portion of the first magnetic pole element and the bottom end portion of the second magnetic pole element to magnetically connect the magnetic bodies.

To facilitate assembly of the stator, a pair of support members having upward and downward claw poles inserted therein and supporting the upward and downward claw poles with a coil inserted therein is further included. At each of the pair of support members, a first position determining portion into which a bottom end portion of one of the upward claw pole and the downward claw pole is insertable and a second position determining portion into which a top end portion of the other of the upward claw pole and the downward claw pole is insertable may be formed.

When each of the claw poles is formed as an individual magnetic pole element, the pair of support members having the upward and downward claw poles inserted therein and supporting the upward and downward claw poles with the coil inserted therein is further included to facilitate assembly of the stator. At each of the pair of support members, a plurality of position determining portions into which a plurality of such magnetic pole elements forming claw poles are inserted may be formed.

However, in the case where the claw pole includes the first magnetic pole element arranged inside the coil and the second magnetic pole element arranged outside the coil, since the outer periphery of the coil is larger than the inner periphery thereof, a gap is formed between the second magnetic pole elements of the claw poles adjacent to each other in the circumferential direction, and magnetic flux leaks through the gap. Therefore, although the current is increased to obtain the torque, magnetic saturation is reached before the required torque is reached, and thus it is impossible to provide the required torque.

Therefore, according to an aspect of the present disclosure, the motor including the coil formed by winding the lead wire and the plurality of claw poles formed in the circumferential direction may further include a magnetic body forming a magnetic path between the claw poles to induce a magnetic flux passing through one of the claw poles disposed outside the coil and mutually adjacent to the other of the claw poles in the circumferential direction.

In the motor configured as described above, since the magnetic body is installed between the claw poles adjacent to each other in the circumferential direction, and the magnetic flux passing through one of the claw poles is induced to the other of the claw poles, leakage of the magnetic flux can be suppressed to prevent magnetic saturation, thereby providing a required torque.

As an example, the magnetic body may have a cylindrical shape surrounding the outside of the coil.

In this case, for example, since a steel plate is wound in a cylindrical shape to provide a random thickness, and a magnetic body in a cylindrical shape is mounted outside the coil, the magnetic body can be manufactured or attached without complication.

As another example, the magnetic body may include a plurality of divided magnetic bodies surrounding the outside of the coil.

In this case, for example, the divided magnetic bodies may be simply formed and manufactured by stacking a plurality of electronic steel plates in the diameter direction.

As described above, as a detailed example in which the magnetic body includes a plurality of divided magnetic bodies, a configuration is provided in which each of the claw poles may include the first magnetic pole element disposed inward from the coil and the second magnetic pole element with the coil interposed therebetween, and the divided magnetic bodies are arranged between the second magnetic pole elements of the claw poles adjacent to each other in the circumferential direction.

Even in this configuration, leakage of magnetic flux can be suppressed and a required torque can be provided.

However, as described above, in the case where a configuration in which a magnetic body is mounted in order to suppress leakage of magnetic flux is applied to a single-phase motor, one or more of the inventors of the present application analyzed an electromagnetic field in a configuration in which a claw pole includes a vertical magnetic pole element positioned between a coil and a rotor and a horizontal magnetic pole element extending from an end portion of the vertical magnetic pole element and positioned at the top or bottom of the coil, and the horizontal magnetic pole element and the magnetic body are in contact with each other.

According to this analysis, as shown in fig. 34, the cogging torque acts in the negative direction, and accompanying this, when the motor is operated, the conduction torque acts in the negative direction. As a result, in the above description, since the composite torque acts in the negative direction, after the motor is manipulated, the rotor is reversed, and stalls until the composite torque becomes zero to be stopped when the load on the motor is large.

Therefore, due to in-depth consideration of the above analysis results by one or more inventors of the present application, in a single-phase motor, a claw pole may include a vertical magnetic pole member positioned between a coil and a rotor, and a horizontal magnetic pole member extending from an end portion of the vertical magnetic pole member and positioned at the top or bottom of the coil, and a gap may be formed between the horizontal magnetic pole member and a magnetic body to rotate the rotor forward by providing a resultant torque acting in a positive direction when the motor is operated.

When a gap is formed between the horizontal magnetic pole element and the magnetic body as described above, the phase of the cogging torque is deviated, and when the horizontal magnetic pole element and the magnetic body are brought into contact with each other due to the analysis of the electromagnetic field, the conduction torque and the resultant torque act in the positive direction. Therefore, after the motor is manipulated, the rotor can be rotated forward and can be prevented from being stopped. Meanwhile, detailed results of the electromagnetic field analysis will be described below.

As a configuration for providing a larger torque acting in the positive direction when the motor is manipulated, there is a configuration in which claw poles are set to be inclined so that the gap increases in the rotational direction of the rotor; or there is a configuration in which a gap formed between the horizontal magnetic pole element positioned at the top of the coil and the magnetic body has a size different from that of a gap formed between the horizontal magnetic pole element positioned at the bottom of the coil and the magnetic body. Meanwhile, the results of analyzing the constructed electromagnetic field will be described below.

In addition, there is another aspect as follows.

There is a general motor control circuit configured to alternately turn on or off one of two pairs of diagonally arranged transistors using an H-bridge circuit to convert a Direct Current (DC) voltage supplied from a power supply into an Alternating Current (AC) voltage and apply the AC voltage to a motor.

In this configuration, since a through current may momentarily flow and transistors may stall when both pairs of transistors are turned on at the same time, a time (so-called dead time) during which all transistors are turned off is a time provided during a time from a state in which one pair of transistors of the two pairs of transistors is turned on to a state in which the other pair of transistors of the two pairs of transistors is turned on.

However, in the dead time described above, energy converged at the coil of the motor flows as a regenerative current through a parasitic diode of the transistor, and a voltage rise of the power line occurs due to so-called kickback, which adversely affects oscillation of the motor or the circuit device.

Therefore, the motor control circuit described in japanese patent laid-open No.2004-135374 causes the ground side transistor to remain in the on state for a longer time than the power supply side transistor in the pair of transistors that are turned off to return the regenerative current on the ground side, so that the regenerative current flows through the parasitic diode to be consumed.

As a result of in-depth consideration, one aspect of the present disclosure proposed by one or more inventors suppresses the voltage increase of the power line caused by the kickback more certainly than the ordinary motor control circuit.

That is, according to an aspect of the present disclosure, the motor control circuit may include: four Metal Oxide Semiconductor Field Effect Transistors (MOSFETs); an H-bridge circuit that supplies electric power from a power supply to the motor; and a drive circuit that outputs a drive signal to each of the MOSFETs and turns on or off two pairs of the MOSFETs arranged diagonally in sequence. When a pair of MOSFETs is turned off, the control circuit turns off the ground side MOSFET and then turns off the power supply side MOSFET after a predetermined period of time has elapsed.

In the above-described motor control circuit, when the pair of MOSFETs is turned off, since the ground side MOSFET is turned off and then the power supply side MOSFET is turned off after a predetermined certain time has elapsed, a circuit that consumes the regenerative current can be formed on the power supply side.

Therefore, the regenerative current can flow not only through the parasitic diode but also through a plurality of circuit devices such as a capacitor mounted on the power supply side, the regenerative electric power can be consumed more efficiently as compared with the ordinary motor control circuit, and the voltage increase of the power line caused by the kickback can be suppressed more certainly.

In addition, according to an aspect of the present disclosure, the motor control circuit may include four MOSFETs, an H-bridge circuit supplying power from a power supply to the motor, and a driving circuit sequentially turning on/off two pairs of MOSFETs arranged diagonally by outputting a driving signal to each of the MOSFETs. Further, a pair of regenerative current consuming MOSFETs installed in parallel with the two power source side MOSFETs, which correspond to the power source side MOSFETs, is also included. When a pair of MOSFETs is turned off, a drive circuit turns on a regenerative-current-consuming MOSFET corresponding to the power-supply-side MOSFET that is turned off.

In the case of the motor control circuit, by turning on the regenerative current consuming MOSFET corresponding to the power source side MOSFET that is turned off, a circuit that consumes the regenerative current can be formed at the power source, and an effect similar to the above-described configuration can be obtained.

In addition, according to an aspect of the present disclosure, the motor control circuit may include four MOSFETs, an H-bridge circuit that supplies power from a power supply to the motor, and a driving circuit that outputs a driving signal to each of the MOSFETs and sequentially turns on or off two pairs of the MOSFETs arranged diagonally in a non-conductive state in which the four MOSFETs are turned off. In the above-described motor control circuit, when two pairs of diagonally arranged MOSFETs are turned on or off in sequence, the drive circuit turns off all four MOSFETs for a preset time to be in a non-conductive state while turning off the ground side MOSFET and turning on the power supply side MOSFET of the pair of MOSFETs before the pair of MOSFETs that are turned on are in a non-conductive state.

In the case of the motor control circuit, since the ground-side MOSFET of the pair of MOSFETs that is turned on before the pair of MOSFETs are in a non-conductive state is turned off and the power-supply-side MOSFET remains turned on, a loop that consumes a regenerative current can be formed on the power supply side, and an effect similar to the above-described configuration can be obtained.

The four MOSFETs may be N-type MOSFETs.

In the above configuration, since the N-type MOSFET has excellent frequency characteristics, heat generated at the MOSFET when performing Pulse Width Modulation (PWM) can be suppressed, compared to the case of using the P-type MOSFET.

Also, according to one aspect of the present disclosure, a motor includes a rotor and a stator, the stator including a plurality of stator elements. Each of the stator elements may include a plurality of claw poles formed in a circumferential direction of the stator element and a coil wound in the circumferential direction of the stator element. The claw pole may comprise a first magnetic pole element and a second magnetic pole element. At least one of the first and second pole elements may include a resistor for altering the flow of magnetic flux.

Advantageous effects

Accordingly, it is an aspect of the present disclosure to provide a motor including a plurality of stator elements stacked in an axial direction without an insulator between the stator elements.

Additional aspects of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Drawings

Fig. 1 is a view showing an overall configuration of a motor according to one embodiment of the present disclosure;

FIG. 2 is a view showing the configuration of a stator element according to one embodiment of the present disclosure;

FIG. 3 is a view showing a side configuration of a stator element according to one embodiment of the present disclosure;

FIG. 4 shows experimental results of the effect of a motor according to one embodiment of the present disclosure;

fig. 5 is a view showing a side configuration of a motor according to one embodiment of the present disclosure;

fig. 6 is a view showing the direction of magnetic poles formed between claw poles of the motor;

fig. 7 is a schematic view showing a configuration of a general motor;

fig. 8 is a view showing an overall configuration of a motor according to one embodiment of the present disclosure;

fig. 9 is a perspective view simulatively showing a part of a rotor of a motor according to one embodiment of the present disclosure;

FIG. 10 is a perspective view simulatively showing a coil of a motor according to one embodiment of the present disclosure;

fig. 11 is a perspective view simulatively showing a stator of a motor according to one embodiment of the present disclosure;

FIG. 12 is a perspective view simulatively showing claw poles of a motor in accordance with one embodiment of the present disclosure;

fig. 13 is a perspective view simulatively showing a supporting member of a stator element of a motor according to one embodiment of the present disclosure;

FIG. 14 is a perspective view simulatively showing claw poles and a support member of a motor according to one embodiment of the present disclosure;

fig. 15 is a perspective view simulatively showing a connection path of a motor according to one embodiment of the present disclosure;

fig. 16 is an exploded perspective view simulatively showing a stator of a motor according to one embodiment of the present disclosure;

fig. 17 is a perspective view simulatively showing a support member of a motor according to one embodiment of the present disclosure;

fig. 18 is a perspective view simulatively showing a hole for cooling a coil according to a modification of the first embodiment;

FIG. 19 is a perspective view simulatively showing coils and claw poles of a motor according to one embodiment of the present disclosure;

FIG. 20 is a perspective view simulatively showing claw poles of a motor in accordance with one embodiment of the present disclosure;

FIG. 21 is a simulated view comparing a claw pole of a motor according to one embodiment of the present disclosure with a conventional claw pole;

FIG. 22 is a perspective view illustrating a claw pole of a motor according to one embodiment of the present disclosure;

FIG. 23 is a perspective view illustrating a claw pole of a motor according to one embodiment of the present disclosure;

FIG. 24 is a perspective view illustrating a claw pole of a motor according to one embodiment of the present disclosure;

fig. 25 is a perspective view illustrating a support member of a motor according to one embodiment of the present disclosure;

fig. 26 is a simulated schematic diagram showing the flow of magnetic flux in the claw pole motor according to the second embodiment;

fig. 27 is a perspective view of a claw pole motor according to a third embodiment;

fig. 28 is a perspective view showing a claw pole and a magnetic body in a simulated manner according to a third embodiment;

fig. 29 is a perspective view showing a magnetic body according to the third embodiment in a simulated manner;

fig. 30 is a perspective view of a claw pole motor according to a modification of the third embodiment;

fig. 31 is a perspective view of a claw pole motor according to a modification of the third embodiment;

fig. 32 is a perspective view of a claw pole motor according to a fourth embodiment;

fig. 33 is a perspective view of a gap of a claw pole motor according to the fourth embodiment;

fig. 34 is a graph showing torque with respect to the rotation angle of a general claw pole motor;

fig. 35 is a graph showing torque with respect to the rotation angle of the claw pole motor according to the fourth embodiment;

fig. 36 is a graph showing a relationship between the torque and the gap size of the claw pole motor according to the fourth embodiment;

fig. 37 is a perspective view of a gap of a claw pole motor according to a modification of the fourth embodiment;

fig. 38 is a graph showing torque with respect to the rotation angle of the claw pole motor according to the modification of the fourth embodiment;

fig. 39 is a perspective view of a claw pole motor according to a modification of the fourth embodiment;

fig. 40 is a partially enlarged view of a gap of the claw pole motor according to a modification of the fourth embodiment;

fig. 41 is a graph showing torque with respect to a rotation angle of the claw pole motor according to the modification of the fourth embodiment;

fig. 42 is a view showing the configuration of a motor control circuit according to one embodiment of the present disclosure;

FIG. 43 is a timing diagram of the current carrying time of each Metal Oxide Semiconductor Field Effect Transistor (MOSFET) of the motor control circuit according to one embodiment of the present disclosure;

FIG. 44 is a flow chart illustrating operation of a motor control circuit according to one embodiment of the present disclosure;

FIG. 45 is a circuit schematic illustrating the flow of regenerative current of a motor control circuit according to one embodiment of the present disclosure;

FIG. 46 is a graph illustrating the effect of a motor control circuit according to one embodiment of the present disclosure;

fig. 47 is a schematic diagram showing the configuration of a motor control circuit according to an embodiment of the present disclosure;

fig. 48 is a circuit schematic illustrating the flow of regenerative current of a motor control circuit according to one embodiment of the present disclosure.

Best mode for carrying out the invention

Reference will now be made in detail to the exemplary embodiments illustrated in the drawings, wherein like reference numerals refer to like elements throughout. The embodiments are described below in order to explain the present disclosure by referring to the figures.

Hereinafter, a motor according to one embodiment of the present disclosure will be described with reference to the accompanying drawings.

As shown in fig. 1, a motor 100 according to one embodiment of the present disclosure is used as a compressor forming, for example, a cooling cycle, and includes a stator 20 and a rotor 10 rotatably mounted in the stator 20.

First, the rotor 10 will be described.

The rotor 10 is a so-called Interior Permanent Magnet (IPM) that includes a core 11 formed in a cylindrical shape, in which a rotor shaft (not shown) as a rotation shaft is attached to a through hole 10H that vertically passes through the core, and includes a plurality of magnet insertion holes formed along a circumferential portion and a plurality of permanent magnets 12 to be inserted into the plurality of magnet insertion holes.

The core 11 has a shape in which a plurality of electric steel plates are stacked.

The plurality of permanent magnets 12 are arranged in a V shape with the rotation center side as a vertex, and form magnetic poles. In fig. 1, 8 magnets are formed. Meanwhile, the number of magnetic poles can be changed appropriately.

Next, the stator 20 will be described.

The stator 20 is formed in a cylindrical shape in which the rotor 10 is rotatably installed in a through hole 20H vertically passing through the stator. In fig. 1, the stator 20 is formed by stacking a plurality of stator elements 3 in the axial direction.

As shown in fig. 2, the stator element 3 may include an upper core 4a, a lower core 4b, and a coil 4c, the upper core 4a including a plurality of downward claw poles 43a along a circumferential direction of the stator element 3, the lower core 4b including a plurality of upward claw poles 43b along the circumferential direction of the stator element 3, the coil 4c being inserted into the upper core 4a and the lower core 4b and wound along the circumferential direction of the stator element 3.

In more detail, as shown in fig. 1 and 2, the upward claw poles 43b and the downward claw poles 43a are alternately arranged in the circumferential direction of the stator element 3, and are combined so that the coil 4c can be inserted into the upper core 4a and the lower core 4 b.

The upper core 4a may include a base plate portion 41a including a through hole at the center thereof, for example, in a cylindrical shape, a side plate portion 42a extending downward in the axial direction from an outer edge portion of the base plate portion 41a, and the plurality of downward claw poles 43a extending downward in the axial direction from an inner edge of the base plate portion 41 a.

The downward claw poles 43a are formed to be equidistant in the circumferential direction of the stator element 3 and extend further downward than the cross section of the side panel portion 42 a. All downward claw poles 43a may have the same shape, for example, an approximately rectangular shape.

The lower core 4b may include a base plate portion 41b including a through hole in a center thereof, for example, having a cylindrical shape, a side plate portion 42b extending upward in the axial direction from an outer edge portion of the base plate portion 41b, and the plurality of upward claw poles 43b extending upward in the axial direction from an inner edge of the base plate portion 41 b. In one embodiment of the present disclosure, the upper core 4a and the lower core 4b are configured to be vertically opposite to each other.

Therefore, the upward claw poles 43b are formed to be equidistant in the circumferential direction of the stator element 3 and extend further upward than the cross section of the side panel portion 42 b. All the upward claws 43b may have the same shape, for example, an approximately rectangular shape.

Meanwhile, as shown in fig. 1, in one embodiment of the present disclosure, in a state where the upper core 4a and the lower core 4b are coupled, the linear cross section 431 of each of the upward claw poles 43b and the top surface 31 of the upper core 4a are arranged in the same plane, and the linear cross section 431 of each of the downward claw poles 43a and the bottom surface 32 of the lower core 4b are arranged in the same plane.

By combining the upper core 4a and the lower core 4b, the coil 4c is accommodated in the coil accommodation space formed by the base plate portions 41a and 41b and the side plate portions 42a and 42 b. Here, the coil 4c has a cylindrical shape formed by winding an insulating coated wire in a circumferential direction.

As shown in fig. 1, the stator 20 of the motor 100 according to one embodiment of the present disclosure is formed in a shape in which the above-described two stator elements 3 are stacked in the axial direction.

In more detail, the bottom surface 32 of the stator element 3 on one side (top side) is in contact with the top surface 31 of the stator element 3 on the other side (bottom side) so that the stator elements 3 are stacked on the same axis.

In addition, as shown in fig. 3, in one embodiment of the present invention, the coils 4c of the top-side and bottom-side stator elements 3 are wound in opposite directions to each other, arranged such that the downward claw pole 43a at the top side and the upward claw pole 43b at the bottom side overlap each other as viewed in the axial direction, and arranged such that the upward claw pole 43b at the top side and the downward claw pole 43a at the bottom side overlap each other as viewed in the axial direction.

In more detail, the stator element 3 on one side and the stator element 3 on the other side are overlapped with each other and vertically opposed to each other, and the coils 4c of the stator elements 3 are wound in mutually opposite directions.

In this state, the stator element 3 on one side rotates the claw poles of an odd number (1) from the stator element 3 on the other side about the rotation axis. That is, the stator element 3 on one side is configured to have an angular difference of 180 electrical degrees from the stator element 3 on the other side.

Thus, the top side downward claw pole 43a faces the front of the bottom side upward claw pole 43b, and the top side upward claw pole 43b and the bottom side downward claw pole 43a face opposite directions.

According to the motor 100 according to one embodiment of the present disclosure configured as described above, since the coils 4c of adjacent stator elements 3 are wound in opposite directions as shown in fig. 3, even if all the contact surfaces of the stator elements 3 are north or south poles, it is possible to prevent a short circuit without interposing an insulator between the stator elements 3. Since no insulator is interposed, it is possible to reduce the manufacturing cost and miniaturize the motor 100 in the axial direction as compared with the ordinary motor.

In addition, since the downward claw pole 43a at the top side and the upward claw pole 43b at the bottom side overlap each other as viewed in the axial direction, and the upward claw pole 43b at the top side and the downward claw pole 43a at the bottom side overlap each other as viewed in the axial direction, all the adjacent claw poles in the axial direction are north poles or south poles. Therefore, since the direction of the magnetic field formed by the stator element 3 on one side and the direction of the magnetic field formed by the stator element 3 on the other side become substantially the same direction, and these magnetic fields do not cancel each other, it is not expected that the output of the motor will be reduced.

Experimental data illustrating the above is shown in fig. 4.

The experimental data are results of experiments comparing a general motor with the motor 100 according to one embodiment of the present disclosure. As can be seen from the experimental results, the motor 100 according to one embodiment of the present disclosure has substantially the same induced voltage and outputs torque that is not reduced as compared to a general motor.

Meanwhile, the present disclosure is not limited to the above-described embodiments.

For example, in the above-described embodiment, the two stator elements 3 are arranged such that the downward claw pole 43a at the top side and the upward claw pole 43b at the bottom side face each other's front, and the upward claw pole 43b at the top side and the downward claw pole 43a at the bottom side are opposed to each other, however, as shown in fig. 5, the two stator elements 3 may be arranged so as to form a certain inclination angle α at the claw poles 43a and 43b with respect to the axial direction.

In more detail, the top-side downward claw pole 43a and the bottom-side upward claw pole 43b may at least partially overlap each other as viewed in the axial direction. In addition, the upward claw pole 43b at the top side and the downward claw pole 43a at the bottom side may at least partially overlap each other as viewed in the axial direction.

In addition, the overlapping upward claw poles 43b and downward claw poles 43a are alternately arranged in the circumferential direction with respect to the axial direction as viewed in the axial direction, thereby forming a certain inclination angle α between these claw poles 43a, 43 b.

As shown in fig. 6, according to the motor 100 configured as described above, the inclination angle α can be formed at the stator 20, and the cogging torque can be reduced without forming an insulator between the stator elements 3.

In addition, although the stator according to the present embodiment is formed by stacking two stator elements, the number of electronic elements is not limited to the embodiment and may be three or more.

Also, the rotor is of the IPM type in one embodiment, but may be of the Surface Permanent Magnet (SPM) type or the spoke type.

In the case of the motor in the present embodiment, the rotor may be an inner rotor type positioned inside the stator, or an outer rotor type positioned outside the stator.

Next, a claw-pole motor according to an embodiment of the present disclosure will be described based on one stator element.

As shown in fig. 8, the motor 100 according to one embodiment of the present disclosure may include a rotor 10, a coil 4c, and a stator 20, and is, for example, a motor serving as a compressor forming a cooling cycle.

As shown in fig. 8 and 9, the rotor 10 is a so-called IPM, which includes a core 11 formed in a cylindrical shape, in which a rotor shaft RS as a rotation shaft is attached to a through hole 10H vertically passing through the core, and includes a plurality of magnet insertion holes formed along a circumferential portion and a plurality of permanent magnets 12 to be inserted into the plurality of magnet insertion holes.

The rotor 10 and the rotor shaft RS are rotatably supported by a bearing B at the stator 20.

As shown in fig. 9 and 10, the coil 4c has a cylindrical shape formed by winding the lead wire L having a conductive wire material in the circumferential direction, and is arranged along the outer circumference of the rotor 10.

As shown in fig. 10, the coil 4c according to one embodiment of the present disclosure is formed by pre-winding the lead wire L at a certain height with a predetermined circumferential length and a certain number of winding times. In detail, the lead L is wound while being aligned using a jig or the like, and is impregnated or coated with an adhesive at a cured surface thereof.

As shown in fig. 11, the stator 20 may include: a through hole 20H vertically passing therethrough, the rotor 10 being rotatably installed in the through hole 20H; a plurality of upward claw poles 43 b; a plurality of downward claw poles 43 a; a pair of lower support members 23 and an upper support member 24 which support the claw poles 43b and 43a and house the coil 4 c.

The upward claw poles 43b and the downward claw poles 43a are alternately and intermittently formed in the circumferential direction. In one embodiment, the upward claw poles 43b are formed to be equidistant in the circumferential direction and to be the same shape. Also, the downward claw pole 43a is vertically opposed to the upward claw pole 43b, is formed in the same shape, and is formed to be equidistant in the circumferential direction. In more detail, the upward claw pole 43b forms a u-shape when viewed in the circumferential direction, and the downward claw pole 43a forms an n-shape when viewed in the circumferential direction.

As shown in fig. 12, the claw poles 43b, 43a are formed by stacking a plurality of steel plates 20x in the circumferential direction. Here, the plurality of steel sheets 20x are stacked in a u-shape when viewed from a plane forming the same shape, and are bonded by, for example, an adhesive, varnish, or the like.

Meanwhile, in one embodiment, the shape of the steel plate 20x is one type, and is a left-right symmetrical shape.

In fig. 12, a portion denoted by reference numeral 20t is top end portions of the claw poles 43b and 43a, and a portion denoted by reference numeral 20b is bottom end portions of the claw poles 43b and 43 a.

Here, the lower support member 23 and the upper support member 24 that support the claw poles 43b, 43a are formed of an insulator of a nonmagnetic material (e.g., resin or the like).

Since the lower support member 23 and the upper support member 24 according to one embodiment of the present disclosure have the same shape, the lower support member 23 will be described below as a representative example.

As shown in fig. 13 and 14, the lower support member 23 is formed in an annular plate shape including a through hole 23H formed in the center thereof such that the coil 4c is disposed coaxially with the through hole 23H.

The lower support member 23 according to one embodiment of the present disclosure may include a plurality of position determining parts 231 and 232 that determine the positions of the upward claw pole 43b and the downward claw pole 43 a. In more detail, the lower support member 23 may include a first position determining part 231 and a second position determining part 232, the base end part 20b of the upward claw pole 43b is inserted into the first position determining part 231, and the first position determining part 231 determines the position of the upward claw pole 43b, the tip end part 20t of the downward claw pole 43a is inserted into the second position determining part 232, and the second position determining part 232 determines the position of the downward claw pole 43 a. Meanwhile, in the upper support member 24, the base end portion 20b of the downward claw pole 43a is inserted into the first position determining portion 231, and the tip end portion 20t of the upward claw pole 43b is inserted into the second position determining portion 232.

The first position determining part 231 and the second position determining part 232 are alternately and intermittently formed in the circumferential direction, and are concave parts formed at a side X of the lower support member 23 opposite to the upper support member 24.

In more detail, the first position determining part 231 is a rectangular concave part formed from the inner edge part toward the outer edge part of the lower support member 23, so that the bottom end part 20b of the upward claw pole 43b is stably inserted in the first position determining part 231. Also, the second position determining portion 232 is a pair of rectangular concave portions formed at the inner and outer edge portions of the lower supporting member 23 so that the tip end portions 20b of both sides of the downward claw pole 43a are stably inserted into the second position determining portion 232.

As shown in fig. 14, in one embodiment, the depth of the first position determining part 231 is smaller than the height of the bottom end part 20b (refer to fig. 12) of the upward claw pole 43 b. Therefore, when the upward claw pole 43b is inserted into the first position determining portion 231, the upward side 20U of the lower end portion 20b of the upward claw pole 43b is positioned above the opposite side X of the lower support member 23.

As shown in the upper part of fig. 15, due to the above configuration, the coil 4c inserted between the lower support member 23 and the upper support member 24 (refer to fig. 11) is in contact with the upward claw pole 43b and the downward claw pole 43a, and the air layers S are formed between the coil 4c and the lower support member 23 and between the coil 4c and the upper support member 24.

However, as shown in fig. 15, the lower support member 23 and the upper support member 24 according to one embodiment of the present disclosure include a first opening P1 formed at an opposing portion M (hereinafter referred to as a coil opposing portion M) opposing the coil 4c, a second opening P2 formed at a portion N (hereinafter referred to as a non-coil opposing portion N) not opposing the coil 4c, and a connection path PL connecting the first opening P1 and the second opening P2.

As described above, the lower support member 23 and the upper support member 24 are formed in the same shape. Hereinafter, the connection path PL and the like formed at the lower support member 23 will be described.

The first opening P1 is open toward the air layer S formed between the lower support member 23 and the coil 4c, and the second opening P2 is open toward a space different from the air layer S. That is, the connection path PL connects the air layer S and the space separated from the air layer S.

Here, the connection path PL is a groove formed from the coil opposing portion M toward the non-coil opposing portion N of the lower support member 23. The groove as the connection path PL extends from the coil opposing portion M to the outer edge of the lower support member 23 toward the outside in the diameter direction. In one embodiment, a plurality of such connection paths PL are radially formed.

As shown in the upper portion of fig. 15, a second opening P2 according to one embodiment of the present disclosure is formed to penetrate through the outer side of the coil opposing portion M in the opposite side X of the lower support member 23 opposite to the upper support member 24 and the lateral circumferential surface of the lower support member 23.

Meanwhile, as shown in fig. 13, in one embodiment of the present disclosure, a plurality of connection paths PL are alternately formed between the first position determining part 231 and the second position determining part 232 adjacent to each other. However, the position and number of the connection paths PL may be changed as appropriate.

Here, a method of assembling the motor 100 according to one embodiment of the present disclosure will be briefly described with reference to fig. 16.

First, the lower stator element 201 is formed by inserting the plurality of upward claw poles 43b into the first position determining part 231 of the lower support member 23, and the upper stator element 202 is formed by inserting the plurality of downward claw poles 43a into the first position determining part 231 of the upper support member 24.

Next, the coil 4c is inserted into the lower stator element 201 and the upper stator element 202, and the tip end portion 20t of the upward claw pole 43b is inserted into the second position determining portion 232 of the upper support member 24, so that the tip end portion 20t of the downward claw pole 43a is inserted into the second position determining portion 232 of the lower support member 23.

In addition, when the rotor 10 is arranged in the stator 20, the top and bottom of the stator 20 are fixed using fixing members Z such as bolts formed of a resin material as an insulator. Meanwhile, the fixing member Z may be a screw, a nut, a washer, or the like formed of a resin material as an insulator, in addition to the bolt.

According to the motor 100 according to one embodiment of the present disclosure configured as described above, since the lower support member 23 and the upper support member 24 include the plurality of connection paths PL extending from the coil opposing portion M to the non-coil opposing portion M, the coil 4c can be cooled using air flowing through the connection paths PL.

Further, since the heat of the coil 4c is radiated in the air layer S formed between the coil 4c and the lower support member 23 and between the coil 4c and the upper support member 24, and the connection path PL is connected to the air layer S, a sufficient heat radiation space of the coil 4c can be provided.

Also, since the grooves PL are formed at the lower and upper support members 23 and 24, the coil 4c can be cooled without separately installing a heat radiation member, a fan, increasing the manufacturing cost, and increasing the size of the motor.

Also, since the lower support member 23, the upper support member 24, and the fixing member Z are formed as insulators, the amount of magnetic material used to form the motor 100 can be reduced. Accordingly, since a magnetic path is not formed at the insulator, core loss such as hysteresis loss, eddy current loss, etc. can be significantly reduced, thereby providing high efficiency of the motor 100.

However, since the plurality of claw poles 43b and 43a and the support members 23 and 24 are separately configured, it may be considered that assembling the motor 100 is difficult. However, since each of the support members 23 and 24 includes the plurality of position determining portions 231 and 232 into which the plurality of claw poles 43b and 43a are inserted and which determine the positions of the claw poles 43b and 43a, the plurality of claw poles 43b and 43a can be simply attached to each of the support members 23 and 24.

Also, since the coil 4c has a shape formed by previously bonding the lead wire L into a cylindrical shape, the coil 4c can be simply attached to the support members 23 and 24, and the plurality of claw poles 43b and 43a are attached to the support members 23 and 24.

As described above, the motor 100 according to one embodiment of the present disclosure does not complicate the structure or reduce the productivity.

Although the connection path PL according to the present embodiment has a concave shape, the connection path PL, for example, as shown in the upper portion of fig. 17, may be a slot formed to penetrate through the opposing portion of the upper support member 24 opposing the coil 4c and the portion not opposing the coil 4 c.

Also, as shown in the lower portion of fig. 17, the connection path PL may be a through hole passing through its opposing portion opposing the coil 4c in the thickness direction of the lower support member 23 (or the upper support member 24).

Also, as shown in an upper portion of fig. 18, the lower support member 23 or the upper support member 24 may include coil cooling through holes CH formed at a facing portion opposite to the coil 4 c.

In contrast to the connection path PL according to the above-described embodiment, which is configured to connect the first opening P1 formed at the opposing portion M opposing the coil 4c and the second opening P2 formed at the non-opposing portion N not opposing the coil 4c, all of the coil cooling through holes CH herein are formed at the portion opposing the coil 4 c.

Here, in order to improve the cooling efficiency of the coil 4c, a plurality of such coil cooling through holes CH are intermittently formed along the circumferential direction.

Meanwhile, as described above, the mechanical strength of the lower support member 23 or the upper support member 24 is reduced due to the plurality of coil cooling through holes CH and is damaged at the time of assembly, which becomes a problem.

Therefore, as shown in the lower portion of fig. 18, reinforcing portions are formed at the lower support member 23 and the upper support member 24. The reinforcing portion W is formed between the adjacent coil cooling through holes CH, and is formed of a non-magnetic material such as resin or the like integrated with the lower support member 23 or the upper support member 24. Meanwhile, the reinforcing portion W may be a member separate from the lower support member 23 or the upper support member 24.

In the above configuration, the ambient air may be in direct contact with the coil 4c to efficiently cool the coil, and the reinforcing portion W may provide mechanical strength of the lower support member 23 or the upper support member 24.

In addition, in the present embodiment, although both the lower support member 23 and the upper support member 24 have the connection path PL, the connection path PL may be formed at only one of the lower support member 23 and the upper support member 24.

In addition, the connection path PL according to the present embodiment extends from the portion opposed to the coil 4c to the outside in the diameter direction, but the connection path PL may extend inward in the diameter direction or may have a linear shape.

In addition, since a decrease in mechanical strength of each of the support members 23 and 24 due to the connection path PL becomes a problem as compared with a case where the connection path PL is not formed, the support members 23 and 24 may be formed of an insulating material having higher strength than resin. For example, a strength increasing material such as glass fiber may be added.

Next, a motor according to another embodiment will be described.

Since the motor according to this embodiment is characterized by claw poles, and other components are the same as those of the above-described embodiment, claw poles corresponding to this characteristic will be described in detail hereinafter.

As in the above-described embodiment, in the present embodiment, the upward claw poles 43b are formed in the same shape, and the downward claw poles 43a are formed in the same shape.

Hereinafter, the upward claw pole 43b is explained as a representative example.

As shown in fig. 19 and 20, the upward claw pole 43b may include: a first magnetic pole element 211 opposite to the rotor 10; a second magnetic pole member 212 accommodating a coil 4c interposed between the second magnetic pole member 212 and the first magnetic member 212; and a third pole member 213 interposed between the first pole member 211 and the second pole member 212 and magnetically connected to the pole members 211 and 212.

The upward claw pole 43b is formed by stacking a plurality of steel plates 20x in the circumferential direction of the stator element 3. Here, the steel plate 20x is a single shape formed by integrating the first pole member 211, the second pole member 212, and the third pole member 213.

In more detail, the third magnetic pole element 213 is formed between the base end portion 211b of the first magnetic pole element 211 and the base end portion 212b of the second magnetic pole element 212, and the upward claw-shaped pole 43b according to one embodiment is formed in a u-shape when viewed in the circumferential direction of the stator element 3.

Furthermore, the upward claw pole 43b according to one embodiment is configured such that the top end portion 212t of the second pole element 212 is a magnetic flux inhibitor and the magnetic flux is concentrated more on the bottom end portion 212b than on the top end portion 212 t. In the upward claw pole 43b, the second magnetic pole member 212 formed opposite to the rotor 10 is configured such that the top end portion 212t has a thinner thickness than the bottom end portion 212 b. That is, the shape of the top end portion 212t of the second magnetic pole element 212 is realized as a resistive element, at which the resistance to the magnetic flux is increased, thereby further concentrating the magnetic flux. Meanwhile, since more magnetic flux is concentrated on the bottom end portion 212b than the top end portion 212t in the present embodiment, the thickness of the top end portion 212t is smaller than that of the bottom end portion 212b, and in addition, for example, the top end portion 212t may be formed as a member that is more difficult to pass magnetic flux than the bottom end portion 212b, or the number of steel plates 20x of the top end portion 212t may be smaller than that of the bottom end portion 212 b.

Meanwhile, the thickness described herein is a length in a diameter direction when the motor 100 is assembled, that is, a thickness in a diameter direction when the upward claw pole 43b is supported by the lower support member 23.

In detail, the second magnetic pole member 212 has a uniform thickness from the bottom thereof to a certain height, and gradually narrows from the certain height to the top end surface, and the top end surface of the second magnetic pole member 212 is at the same level as the top end surface of the first magnetic pole member 211.

Here, the coil-opposite side 212a of the second magnetic pole member 212, which is opposite to the coil 4c, is inclined to gradually retract from the coil 4c from the bottom end portion 212b toward the top end portion 212 t. Due to this configuration, the space between the second pole member 212 and the coil 4c can be increased, and leakage of magnetic flux from the second pole member 212 into the coil 4c can be prevented.

Meanwhile, the first magnetic pole member 211 according to one embodiment is configured to have a substantially uniform thickness throughout the bottom end portion 211b and the top end portion 211 t.

According to the motor 100 configured as described above, since the second magnetic pole member 212 positioned opposite to the rotor 10 is configured such that the thickness of the top end portion 212t is thinner than the thickness of the bottom end portion 212b, as shown in fig. 21, magnetic flux can be concentrated on the first magnetic pole member 211 more than the second magnetic pole member 212, and the efficiency of the motor can be increased more than that of the ordinary motor when the current flowing through the coil 4c is at the same level.

Further, since the thickness of the second magnetic pole member 212 is formed to be thinner at the top end portion 212t than at the bottom end portion 212b, the magnetic flux of all the second magnetic pole members 212 is reduced as compared with the case where the thickness is uniform throughout the bottom end portion 212b and the top end portion 212 t. Therefore, since the attractive force generated between each of the claw poles 43a, 43b and the rotor 10 is reduced, the cogging torque can be reduced.

Also, since the upward claw pole 43b and the downward claw pole 43a have the same shape, and each of the claw poles 43b and 43a is formed of the steel plate 20x in a single shape, it is possible to facilitate the assembling operation and simplify the manufacturing process.

For example, the upward claw pole 43b according to the present embodiment is formed by integrating the first magnetic pole element 211, the second magnetic pole element 212, and the third magnetic pole element 213, but may be configured as a plurality of independent magnetic pole elements.

In detail, as shown in fig. 22, the first magnetic pole element 211 may be formed by stacking steel plates 20x into an L-shape (i.e., integrating the first magnetic pole element 211 and the third magnetic pole element 213), and the second magnetic pole element 212 may be formed by stacking steel plates 20x into a rectangular shape (strip shape). On the other hand, the first magnetic pole element 211 may be formed by stacking steel plates 20x into a rectangular shape (strip shape), and the second magnetic pole element 212 may be formed by stacking steel plates 20x into an L shape.

In addition, as shown in fig. 23, the first, second, and third magnetic pole elements 211, 212, and 213 may be separate members, and the first and third magnetic pole elements 211 and 213 may be formed by stacking steel plates 20x in a rectangular shape (strip shape).

In this configuration, the yield of manufacturing the claw poles 43b and 43a can be increased.

In addition, in the present embodiment, the second magnetic pole member 212 is configured to have a uniform thickness from the bottom surface thereof to a height, gradually narrowing from the height to the tip surface. As shown in fig. 24, the second magnetic pole member 212 may include a stepped portion 212x in a stepped shape, the stepped portion 212x being formed in a rectangular shape at a top end portion 212t in a thickness direction of the second magnetic pole member.

In addition, as described above, when the claw poles 43b, 43a are formed as a plurality of separated magnetic pole elements, as shown in fig. 25, the support members 23 and 24 may also include a plurality of position determining portions 233 into which the magnetic pole elements are inserted.

Also, the magnetic pole member is previously accommodated in the position determining part 233 while being integrated therewith, thereby further simplifying the assembly of the motor 100.

In addition, in the present embodiment, although the first magnetic pole member 211 is configured to have a substantially uniform thickness throughout the base end portion 211b and the top end portion 211t, the first magnetic pole member 211 may be configured such that the thickness of the top end portion 211t is greater than the thickness of the base end portion 211b to further increase the magnetic flux density of the first magnetic pole member 211.

Next, a claw pole motor according to a third embodiment of the present disclosure will be described.

Meanwhile, members corresponding to those described in the second embodiment will be denoted by the same reference numerals.

As in the second embodiment, when the claw pole may include the first magnetic pole member arranged inside the coil and the second magnetic pole member arranged outside the coil such that the coil is interposed between the first magnetic pole member and the second magnetic pole member, as shown in fig. 26, since the outer circumference of the coil is larger than the inner circumference thereof, a gap is formed in the circumferential direction between the second magnetic pole members of the adjacent claw poles. Therefore, the gap leaks magnetic flux (dotted line shown in fig. 26).

The claw pole motor according to the third embodiment is configured in consideration of leakage of magnetic flux.

For example, the claw pole motor 100 according to the present embodiment is used as a compressor forming a cooling cycle, and as shown in fig. 27 and 28, it may include a coil 4c, a stator 20, and a rotor 10, the stator 20 may include a plurality of claw poles 43a and 43b formed in a circumferential direction, and the rotor 10 may be rotatably formed inside or outside the stator 20.

Similar to the second embodiment, the stator 20 has a cylindrical shape in which the rotor 10 is rotatably formed in a through hole 20H vertically passing through the stator, and may include a plurality of downward claw poles 43a formed in the circumferential direction and a plurality of upward claw poles 43b formed in the circumferential direction.

In the present embodiment, similarly to the second embodiment, the upward claw pole 43b is formed in the same shape, the downward claw pole 43a is formed in the same shape, and the upward claw pole 43b and the downward claw pole 43a are symmetrical to each other.

Hereinafter, the upward claw pole 43b is explained as a representative example.

As shown in fig. 27 and 28, the upward claw pole 43b may include a first magnetic pole element 211 disposed inside the coil 4c and interposed between the rotor 10 and the coil 4 c.

Although the upward claw pole 43b according to the second embodiment is formed in a u-shape as viewed in the circumferential direction, the upward claw pole 43b according to the present embodiment is formed in an L-shape as viewed in the circumferential direction. That is, the upward claw pole 43b according to the present embodiment may further include a magnetic pole member magnetically connected to the first magnetic pole member 211 (hereinafter, will be referred to as a third magnetic pole member 213 in conformity with the second embodiment), and arranged so as not to cover the outside of the coil 4 c.

Meanwhile, the upward claw pole 43b is formed by stacking a plurality of steel plates in the circumferential direction, and may include the first and third magnetic pole elements 211 and 213 integrated using one type of shape at the steel plates, similarly to the second embodiment.

Also, as shown in fig. 27 and 28, the claw pole motor according to the embodiment may further include a magnetic body 40, the magnetic body 40 forming a magnetic path between a downward claw pole 43a and an upward claw pole 43b to induce a magnetic flux passing through one of the downward claw pole 43a and the upward claw pole 43b arranged outside the coil and adjacent to each other in the circumferential direction.

The magnetic body 40 is arranged to cover the outer circumferential surface of the coil 4c, and may include, for example, a steel plate. More specifically, as shown in fig. 29, the magnetic body 40 according to the present embodiment is formed by, for example, winding a long electric steel plate, and has a cylindrical shape having an inner diameter larger than an outer diameter of the coil 4 c. The initial winding portion and the final winding portion are welded and treated using an annealing process for suppressing spring back. Also, the electric steel plates are wound in a cylindrical shape and then treated with a dipping process, thereby binding gaps between the electric steel plates wound in the cylindrical shape. In addition, as shown in fig. 28, the slots SL in the axial direction are formed at a plurality of random portions in the circumferential direction to reduce the core loss caused by the eddy current. That is, the magnetic body 40 may include a plurality of divided magnetic bodies 41 divided along the circumferential direction.

In the present embodiment, the height of the magnetic body 40 in the axial direction is higher than the height of the coil 4c in the axial direction. However, the height of the magnetic body 40 may be appropriately changed.

According to the claw pole motor 100 configured as described above, since the magnetic body 40 is installed between the downward claw pole 43a and the upward claw pole 43b adjacent to each other in the circumferential direction, and the magnetic flux passing through one of the claw poles 43a and 43b is induced to the other side, it is possible to suppress leakage of the magnetic flux between the downward claw pole 43a and the upward claw pole 43 b. Therefore, even in the case where a large torque is required, it is possible to prevent magnetic saturation and supply the necessary torque.

More specifically, as shown in fig. 28, the magnetic circuit 1 and the magnetic circuit 2 are formed in accordance with the direction of current flowing through the coil 4c, the magnetic circuit 1 passes through the rotor 10 in the order of the downward claw pole 43a, the magnetic body 40, and the upward claw pole 43b, and then again toward the rotor 10, and the magnetic circuit 2 passes through the rotor 10 in the reverse order of the upward claw pole 43b, the magnetic body 40, and the downward claw pole 43a, and then again toward the rotor 10.

According to the claw pole motor 100 of the present embodiment, since leakage of magnetic flux in the magnetic circuit 1 and the magnetic circuit 2 can be suppressed, the induced voltage can be increased by about 1.55 times, and the available torque can be increased by about 1.55 times, as compared with the case where the claw pole motor 100 configured not to use a magnetic body (for example, the configuration shown in fig. 26) is configured.

For example, as shown in fig. 30, although the magnetic body 40 according to the present embodiment is formed by winding an electric steel plate into a cylindrical shape, a plurality of divided magnetic bodies 41 covering the outside of the coil 4c may be provided in a polygonal shape.

In addition, as shown in fig. 30, even if the divided magnetic body 41 according to the present embodiment is formed by dividing the electric steel plate wound in a cylindrical shape in such a manner that the slits SL are formed therein in the axial direction of the electric steel plate wound in a cylindrical shape, the divided magnetic body 41 may have, for example, a rectangular parallelepiped shape formed by arranging the electric steel plate in a rectangular shape in the diameter direction. Meanwhile, magnetic body 41 is not limited to the arrangement of the electric steel plates having a rectangular shape, and may be a block body. Also, the shape is not limited to the rectangular parallelepiped shape, and may be any shape that satisfies a magnetic path between claw poles adjacent in the circumferential direction.

In addition, in the present embodiment, the claw poles 43a and 43b are arranged so as not to cover the outer circumference of the coil 4c and formed in an L-shape when viewed in the circumferential direction, but the claw poles 43a and 43b may be formed in an n-shape when viewed in the circumferential direction as in the second embodiment.

In this case, as shown in fig. 31, the divided magnetic body 41 may be disposed outside the coil 4c between the downward claw pole 43a and the upward claw pole 43b adjacent in the circumferential direction. In addition, the present disclosure is not limited to the embodiment, and may be modified into various forms without departing from the concept thereof.

Next, a claw pole motor according to a fourth embodiment of the present disclosure will be described.

The claw pole motor according to the present embodiment is a single-phase claw pole motor, and as shown in fig. 32 and 33, similarly to the third embodiment, in a detailed configuration, may include: a downward claw pole 43a and an upward claw pole 43b formed in an L-shape when viewed in the circumferential direction; and a magnetic body 40 that forms a magnetic path between the downward claw pole 43a and the upward claw pole 43 b.

The downward claw pole 43a and the upward claw pole 43b are positioned between the coil 4c and the rotor 10, and include: a vertical magnetic pole 21T (corresponding to the first magnetic pole element 211 in the third embodiment) extending in the axial direction; and a horizontal magnetic pole member 21L (corresponding to the third magnetic pole member 213 in the third embodiment) which extends in the diameter direction from the end portion of the vertical magnetic pole member 21T and is positioned at the bottom or top of the coil 4 c.

The magnetic body 40 forms a magnetic path that induces magnetic flux passing through one of the downward claw pole 3a and the upward claw pole 43b to the other side and is formed in a cylindrical shape. At least a part of the magnetic body 40 is mounted to overlap the horizontal magnetic pole element 21L when viewed in the axial direction. Here, the horizontal magnetic pole element 21L extends further to the outside than the magnetic body 40 in the diameter direction.

In the present embodiment, a gap Sx is formed between the magnetic body 40 and the horizontal magnetic pole element 21L.

In more detail, the guide portion G is formed on the opposite surfaces of the upper support member 24 supporting the downward claw pole 43a and the lower support member 23 supporting the upward claw pole 43b, and the magnetic body 40 is mounted on the guide portion G to form the gap Sx having a size according to the height of the bottom plate of the guide portion G.

Here, as shown in fig. 33, a gap Sx is formed between the horizontal magnetic pole element 21L of the downward claw pole 43a and the magnetic body 40, and between the horizontal magnetic pole element 21L of the upward claw pole 43b and the magnetic body 40. Here, the gap Sx has substantially the same size. In other words, all distances of the gap between the magnetic body 40 and the horizontal magnetic pole member 21L are configured to have the same length.

Here, the result of analyzing the electromagnetic field of the configuration in which the horizontal magnetic pole element 21L and the magnetic body 40 are in contact with each other is shown in fig. 34. As can be seen from the results, when the horizontal magnetic pole element 21L and the magnetic body 40 are in contact with each other, the cogging torque acts in the negative direction when the motor is operated, and along with this, the conduction torque also acts in the negative direction. As a result, in the above description, since the composite torque acts in the negative direction, the rotor 10 starts to reverse after the motor is manipulated, and stops rotating until the composite torque becomes zero to be stopped when the load on the motor is large.

In contrast to this, the result of analyzing the electromagnetic field of the configuration in which the gap Sx is formed between the horizontal magnetic pole element 21L and the magnetic body 40 is shown in fig. 35. As can be seen from this result, since the gap Sx is formed between the horizontal magnetic pole element 21L and the magnetic body 40, the phase of the cogging torque is deviated by 90 degrees compared to the case where the horizontal magnetic pole element 21L is in contact with the magnetic body 40, and when the motor is steered, the conduction torque and the resultant torque act in the positive direction. Therefore, after the motor is manipulated, the rotor 10 may be rotated forward and may be prevented from being stopped.

Meanwhile, when the gap Sx is formed between the horizontal magnetic pole element 21L and the magnetic body 40, a delay of the magnetic field generated when the magnetic flux passes through the gap Sx and a delay of the generated cogging torque with respect to the conduction torque are considered to be causes that the phase of the cogging torque is deviated from 90 degrees.

However, as shown in fig. 36, when compared with the same current, the magnetic flux density decreases due to leakage of the magnetic flux from the gap Sx, and magnetic saturation easily occurs when the gap Sx is large. As a result, the induced voltage decreases, and the torque also decreases. Therefore, the gap Sx may be about 0.5mm to 0.6mm in consideration of aspects of manufacturing management and a result of analyzing the electromagnetic field.

In the present embodiment, the gap Sx (hereinafter, referred to as a first gap Sx1) between the horizontal magnetic pole element 21L of the downward claw pole 43a and the magnetic body 40 and the gap Sx (hereinafter, referred to as a second gap Sx2) between the horizontal magnetic pole element 21L of the upward claw pole 43b and the magnetic body 40 have the same size. However, as shown in fig. 37, the first gap Sx1 and the second gap Sx2 may have different sizes.

In more detail, as shown in fig. 38, the first gap Sx1 may be formed smaller than the second gap Sx2 to provide a large cogging torque when the motor is manipulated.

In addition, as shown in fig. 39 and 40, the downward claw pole 43a and the upward claw pole 43b may be formed to be inclined such that the gap Sx increases in the rotational direction of the rotor (herein, counterclockwise as viewed from above).

In detail, the claw poles 43a and 43b provided at the first and second position determining portions 231 and 232 are inclined by inclining the bottom surfaces of the first and second position determining portions 232 formed at the lower and upper support members 23 and 24. Therefore, between the horizontal magnetic pole element 21L and the magnetic body 40, the gap SxB in the rotational direction of the rotor is increased to be larger than the gap SxA in the reverse direction of the rotor.

In this configuration, as shown in fig. 41, when the motor is operated, a larger cogging torque can be provided.

Next, a motor control circuit according to one embodiment of the present disclosure will be described with reference to the drawings.

For example, the motor control circuit 100z according to one embodiment of the present disclosure is used to drive a single-phase motor Mz as shown in fig. 42, and for example, converts Direct Current (DC) power supplied from a direct current power supply 10z into Alternating Current (AC) power to be applied to the motor Mz.

Also, the DC power supply 10z may be an AC/DC converter.

In detail, the motor control circuit 100z may include: a backflow prevention diode D1 installed on the high voltage side of the DC power supply 10 z; a smoothing capacitor Cz mounted in parallel with the DC power supply 10 z; an H-bridge circuit 20z that converts DC power supplied from a DC power supply 10z into AC power and applies the AC power to the motor Mz; and a drive circuit 30 that outputs a drive signal to a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) forming the H-bridge circuit 20 z.

The H-bridge circuit 20z may include four MOSFETs each having a parasitic diode D. Here, all four MOSFETs are N-channel type MOSFETs.

In more detail, the H-bridge circuit 20z may include first and second MOSFETs 2a and 2b connected in series to the DC power supply 10z and third and fourth MOSFETs 2c and 2d connected in series to the DC power supply 10 z. The first MOSFET2a and the second MOSFET2b are connected in parallel to the third MOSFET2c and the fourth MOSFET2 d. The coil of the motor Mz is connected between the contact point of the first MOSFET2a and the second MOSFET2b and the contact point of the third MOSFET2c and the fourth MOSFET2 d.

Hereinafter, for convenience of description, the first MOSFET2a and the third MOSFET2c are referred to as a power source side MOSFET2x, and the second MOSFET2b and the fourth MOSFET 2d are referred to as a ground side MOSFET2 y.

The driving circuit 30 turns on/off each MOSFET by outputting a driving signal to each MOSFET and controlling a gate voltage of each MOSFET.

In more detail, the drive circuit 30 alternately turns on or off one of the two pairs of diagonally arranged MOSFETs. In other words, as shown in fig. 43, the drive circuit 30 is switched between a first ON state in which the first MOSFET2a and the fourth MOSFET 2d are turned ON (ON) and the second MOSFET2b and the third MOSFET2c are turned OFF (OFF) and a second ON state in which the first MOSFET2a and the fourth MOSFET 2d are turned OFF (OFF) and the second MOSFET2b and the third MOSFET2c are turned ON (ON).

The drive circuit 30 of the motor control circuit according to one embodiment of the present disclosure is configured to form a non-conductive state (so-called dead time) in which all four MOSFETs are turned off, for example, several microseconds μ s between the first conductive state and the second conductive state.

Also, as shown in fig. 43, when the pair of MOSFETs is turned off from the on state, the drive circuit 30 turns off the ground side MOSFET 2y, and after a preset certain time, turns off the power supply side MOSFET2 x.

That is, before the non-conductive state, the drive circuit 30 turns off the ground side MOSFET 2y of the pair of MOSFETs that is turned ON, and the power supply side MOSFET2x remains ON (ON).

Due to the above configuration, in one embodiment, the ground side MOSFET 2y is turned on at 160 ° to 170 °, for example, and the power supply side MOSFET2X is turned on at 178 °, for example.

Hereinafter, an operation of the drive circuit 30 of the motor control circuit according to one embodiment of the present disclosure will be described with reference to a flowchart of fig. 44.

When the control signal for the rotation motor Mz is inputted from the outside, the driving circuit 30 receives the control signal and simultaneously turns on the first MOSFET2a and the fourth MOSFET 2d (S1).

Next, the fourth MOSFET 2d of the ground side MOSFET 2y among the MOSFETs that are turned on is turned off (S2). Accordingly, as shown in the upper part of fig. 45, the regenerative current shown by the thick arrow flows through the loop formed by the parasitic diodes D of the first MOSFET2a and the third MOSFET2c, and a part thereof flows through the smoothing capacitor Cz.

In addition, after the fourth MOSFET 2d is turned off and a preset certain time has elapsed, the first MOSFET2a as the power source side MOSFET2x is turned off (S3) to be in a non-conductive state in which all four MOSFETs are turned off for, for example, several microseconds μ S (S4).

Sequentially, the second MOSFET2b and the third MOSFET2c are simultaneously turned on (S5).

After that, like S2 to S4, the second MOSFET2b, which is the ground side MOSFET 2y, of the MOSFETs that are turned on is turned off (S6). As shown in the lower part of fig. 45, the regenerative current shown by the thick arrow flows through the loop formed by the parasitic diode D of the third MOSFET2c and the first MOSFET2a, and a part thereof flows through the smoothing capacitor Cz.

In addition, after the second MOSFET2b is turned off and a preset certain time elapses, the third MOSFET2c as the power source side MOSFET2x is turned off (S7) to be in a non-conductive state in which all four MOSFETs are turned off, for example, for several microseconds μ S (S8).

Thereafter, S1 through S8 are repeated. However, when the control completion signal for stopping the motor Mz is inputted from the outside (S9), the driving circuit 30 receives the control completion signal and turns off each of the MOSFETs to complete the control of the motor Mz.

According to the motor control circuit 100z of one embodiment of the present disclosure configured as described above, when the pair of MOSFETs is turned off, since the ground side MOSFET 2y is turned off, the power supply side MOSFET2x is turned off after a preset certain time, and the regenerative current converged at the coil of the motor Mz can be looped at the power supply 10z and consumed.

Therefore, in addition to the parasitic diode D of the power supply side MOSFET2x, the regenerative current can flow through a plurality of circuit devices such as the smoothing capacitor Cz installed at the power supply 10z, and the regenerative power can be efficiently consumed. In addition, as shown in fig. 46, the voltage increase of the power line caused by the kickback can be suppressed more accurately than in the general manner.

Further, since all the four MOSFETs forming the H-bridge circuit 20z are N-channel type MOSFETs, heat generated when a regenerative current flows through the parasitic diode D can be suppressed as compared with an H-bridge circuit using P-channel type MOSFETs.

For example, as shown in fig. 47, the motor control circuit 100z may further include a pair of regenerative current consumption MOSFETs 2z corresponding to the two power supply side MOSFETs 2x and connected in parallel with the corresponding power supply side MOSFETs 2 x.

In this configuration, as shown in fig. 47, the drive circuit 30 may be configured to turn off a pair of diagonally arranged MOSFETs, and turn off the regenerative current consuming MOSFET2z corresponding to the power source side MOSFET2x that is turned off.

According to the motor control circuit 100z configured as described above, a circuit that consumes the regenerative current indicated by a thick arrow can be formed at the power supply 10z, the regenerative electric power can be consumed more accurately than the ordinary motor control circuit, and as shown in fig. 48, by turning on the regenerative current consuming MOSFET2z corresponding to the power supply side MOSFET2X that is turned off, the voltage rise of the power line caused by the kickback can be suppressed accurately as in the embodiment.

The drive circuit may be configured, for example, to control Pulse Width Modulation (PWM) of the power supply side MOSFET.

Also, in this embodiment, a pair of diagonally arranged MOSFETs are simultaneously turned on. However, a pair of MOSFETs may be turned on with a time difference.

Also, the motor control circuit according to the embodiment is used to control an AC motor, but may be used to control a DC motor.

In addition, the present disclosure is not limited to the embodiment, and may be modified into various forms without departing from the concept thereof.

As is apparent from the above description, since the insulator is unnecessary, for example, even in the case where a skew angle is formed at the stator, the motor can be miniaturized in the axial direction thereof, and an increase in manufacturing cost can be prevented as compared with a general motor.

Also, according to the embodiments of the present disclosure, heat generated at the coil may be discharged without installing a heat dissipation member, a fan, or the like.

Also, according to the embodiments of the present disclosure, by configuring the claw pole in a shape of concentrating magnetic flux, high efficiency of the motor may be provided.

Also, according to the embodiments of the present disclosure, the efficiency of consuming regenerative power can be improved as compared with the ordinary motor, and the voltage rise of the power line caused by the kickback can be more accurately suppressed.

Although exemplary embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.

Claims

1. A motor, comprising:

a stator comprising a plurality of stator elements, each of the stator elements comprising:

a plurality of claw poles arranged along a circumferential direction of the stator element; and

a coil wound in a circumferential direction of the stator element,

wherein,

the winding directions of the respective coils of mutually adjacent stator elements among the plurality of stator elements are opposite to each other, and

the claw poles of mutually adjacent stator elements are opposite to each other and the mutually opposite claw poles have the same polarity.

2. The motor according to claim 1, wherein the claw poles of mutually adjacent stator elements are arranged to have a predetermined skew angle between mutually opposing claw poles of mutually adjacent stator elements.

3. The motor of claim 1,

each of the stator elements further comprises:

a support member configured to support the plurality of claw poles and accommodate the coil, and

at least one connection path provided in at least one of the support members.

4. The motor of claim 3, wherein the at least one connection path includes a first portion disposed opposite the coil and a second portion disposed not opposite the coil.

5. The motor of claim 3, wherein the at least one connection path has at least one of a groove, a slit, and a through hole.

6. The motor of claim 5, wherein the at least one connection path comprises a groove shape and a slot shape.

7. The motor of claim 1, wherein, for each of the stator elements:

each of the plurality of claw poles includes a first magnetic pole element and a second magnetic pole element, and at least one of the first magnetic pole element and the second magnetic pole element is configured to include an inhibitor portion configured to alter a magnetic flux flow.

8. The motor of claim 7, further comprising a rotor,

wherein,

the first magnetic pole element of the claw pole is configured to be opposed to the rotor, and

the second pole member of the claw pole is configured to be magnetically connected to the first pole member and to receive the coil with the first pole member.

9. The motor of claim 7, wherein the second pole element of a claw pole is configured such that magnetic flux is concentrated on its bottom end portion more than on its top end portion.

10. The motor of claim 9, wherein the second magnetic pole element of a claw pole is configured such that a top end portion has a thickness in a radial direction of the stator that is thinner than a thickness of a bottom end portion.

11. The motor according to claim 10, wherein the second magnetic pole element of a claw pole is configured such that a distance between sides of the second magnetic pole element facing an outer circumferential side of the coil increases from the bottom end portion toward the top end portion.

12. The motor of claim 7, wherein the second magnetic pole element of a claw pole is configured such that a tip portion thereof has a stepped shape.

13. The motor of claim 1, wherein, for each of the stator elements:

the plurality of claw poles comprises at least one upward claw pole and at least one downward claw pole,

the at least one upward claw pole includes steel plates stacked in a circumferential direction of the stator element, and the steel plates have a u-shape when viewed in the circumferential direction of the stator element, and

the at least one downward claw pole includes steel plates stacked in a circumferential direction of the stator element, and the steel plates have an n-shape when viewed in the circumferential direction of the stator element.

14. The motor of claim 7,

the first and second pole elements are constructed as separate components,

the first magnetic pole element includes steel plates stacked in a circumferential direction of the stator element and having the same shape, and

the second magnetic pole element includes steel plates stacked in a circumferential direction of the stator element and having the same shape.

15. The motor of claim 7, wherein a claw pole further comprises a third magnetic pole element interposed between the base end portions of the first and second magnetic pole elements to magnetically connect the first and second magnetic pole elements.