KR102609369B1 - Single phase claw pole motor - Google Patents

Abstract

The present invention provides a single-phase claw-pole motor (100) in which a plurality of stator elements (3) are stacked, in which an insulating material between the stator elements (3) is unnecessary. According to the present invention, the stator 20 is provided with a plurality of stator elements 3 stacked, and the stator elements 3 include a plurality of claw poles 43a and 43b formed along the circumferential direction, and a plurality of claw poles 43a and 43b formed along the circumferential direction. and coils 4c of adjacent stator elements 3 are wound in opposite directions, and in the adjacent stator elements 3, one stator element 3 The claw poles 43a, 43b of the stator element 3 on the other side are arranged so that they face each other and have the same polarity.

Description

Single phase claw pole motor{SINGLE PHASE CLAW POLE MOTOR}

The present invention relates to a single phase claw pole motor.

As shown in Patent Document 1, a conventional single-phase claw pole motor includes a stator and a rotor rotatably installed within the stator, and the stator has an upper side where a plurality of downward claw poles are formed along the circumferential direction. It is provided with a core, a lower core on which a plurality of upward claw poles are formed along the circumferential direction, and a coil wound in the circumferential direction.

More specifically, each core and the coil are configured such that the upward claw pole and the downward claw pole are alternately arranged in the circumferential direction, and the coil is inserted into each core.

However, for example, when it is desired to form a skew angle in the axial direction on the stator side, the stator elements formed by combining each core and coil as described above may be stacked in the axial direction to form a stator.

In this case, taking the upper part of FIG. 7 as an example, if one side of the contact surface of the upper stator element and the lower stator element becomes the N pole and the other side becomes the S pole, a short circuit occurs between these stator elements.

From this, conventionally, taking the bottom picture of FIG. 7 as an example, stator elements are stacked with an insulating material interposed between the stator elements.

However, in the above-described configuration, the insulating material interposed between the stator elements becomes an obstacle to miniaturizing the motor, or the material cost increases as the insulating material is used.

Patent Document 1: Japanese Patent Publication No. 2013-104442 Patent Document 2: Japanese Patent Publication No. 2009-005421 Patent Document 3: Japanese Patent Publication No. 2004-135374

Accordingly, the present invention was made to solve the above-mentioned problem, and the object is to make it unnecessary to insulate between stator elements in a single-phase claw-pole motor in which a plurality of stator elements are stacked in the axial direction.

The single-phase claw-pole motor according to the present invention has a stator and a roller. The stator includes a plurality of stacked stator elements. The stator element has a plurality of claw poles formed along the circumferential direction of the stator element and a coil wound in the circumferential direction of the stator element, and the coils of the adjacent stator elements are wound in opposite directions. Additionally, in the stator elements adjacent to each other, the claw poles of one stator element and the claw poles of the other stator element are arranged to face each other and have the same polarity.

In a single-phase claw-pole motor constructed in this way, since the coils of neighboring stator elements are wound in opposite directions, the contact surfaces of these stator elements are all N-pole or S-pole, and can be operated without interposing insulators between stator elements. Short circuits can be prevented, and furthermore, it is possible to miniaturize the motor in the axial direction while reducing material costs compared to before.

Here, even when the coils of neighboring stator elements are wound in opposite directions, as shown in FIG. 6, one of the opposing claw poles in the neighboring stator elements becomes the N pole and the other one becomes the S pole. When arranged as such, the direction of magnetic flux formed between the claw poles of each stator element is in the opposite direction. As a result, the magnetic fluxes cancel each other out and the output of the motor decreases.

In contrast, in the single-phase claw-pole motor according to the present invention configured as described above, in the stator elements adjacent to each other, the claw poles of one stator element and the claw poles of the other stator element face each other and have the same polarity. Because it is configured so that the direction of the magnetic flux formed between the claw poles of each stator element is in the same direction, it is possible to prevent a decrease in the output of the motor.

An embodiment in which the effect of the present invention is more significantly exhibited includes a configuration in which a predetermined skew angle is formed between opposing claw poles in the stator elements adjacent to each other.

Specific embodiments of the rotor include surface magnet type, embedded magnet type, or spoke type.

In addition, there are also problems as mentioned below.

As shown in Patent Document 2, a conventional claw-pole motor includes a plurality of claw-poles formed along the circumferential direction and coils arranged along these claw-poles.

In such a claw-pole motor, if a heat dissipation member or fan is installed to dissipate heat generated in the coil, there is a problem that it cannot meet recent requests for motor miniaturization and material costs increase.

Meanwhile, the inventor of the present invention conducted in-depth studies on a configuration that dissipates heat generated in the coil without separately installing a heat dissipation member, etc.

As a result of the in-depth study described above, the present invention can provide a claw pole motor that can dissipate heat generated in the coil without installing a heat dissipation member, fan, etc.

That is, the claw-pole motor according to the present invention is a claw-pole motor having a plurality of claw-poles and a coil, and is provided with a pair of support members that support the claw-poles and insert the coil, and the pair of supports A communication path is formed in at least one of the members, and the communication path is provided to communicate with a first opening formed in a portion facing the coil and a second opening formed in a portion not opposing the coil.

According to this claw pole motor, since the support member has a communication path that communicates the first opening formed in the portion facing the coil and the second opening formed in the portion not opposing the coil, the air flowing into this communication path The coil can be cooled using . Additionally, since this communication path is formed in a pair of support members that sandwich the coil, the coil can be cooled without separately installing a heat radiating member, fan, etc.

A specific embodiment of the communication path includes a concave groove or slit formed from a portion facing the coil to a portion not facing the coil.

In order to more reliably cool the coil, it is preferable that each of the support members has a plurality of the concave grooves.

In an embodiment for forming more concave grooves in the support member, each of the support members has a circular plate shape, and the concave groove extends radially outward from a portion opposite to the coil. It is desirable.

In order to reduce iron loss, it is preferable that each of the above-mentioned support members is non-magnetic.

In addition, there are also problems as mentioned below.

As shown in Patent Document 2, a conventional claw pole motor is provided with a plurality of claw poles formed along the circumferential direction and coils arranged along these claw poles, and each claw pole is formed of a plurality of U-shaped steel plates in the circumferential direction. It is known that it is constructed by stacking pieces.

More specifically, since the magnetic flux of the claw pole gradually increases from the tip to the base end, the steel plate at approximately the center of the circumferential direction is made longer than the steel plates on both sides, so that the cross-sectional area of the claw pole becomes larger from the tip to the base end. .

However, only the rotor side of each claw pole is configured so that the cross-sectional area of the claw pole increases from the tip to the proximal end, and the cross-sectional area on the opposite side of the rotor of each claw pole is configured to be approximately the same size from the tip to the proximal end. In this configuration, the magnetic flux is more likely to pass through the side opposite the rotor than the rotor side of each claw pole, and the magnetic flux density on the rotor side of each claw pole becomes low, which actually reduces the efficiency of the motor.

Accordingly, the present invention was made to solve the above-mentioned problems, and its purpose is to improve the shape of the claw pole so that the efficiency of the claw pole motor is improved.

That is, the claw pole motor according to the present invention includes a stator having upward claw poles and downward claw poles formed alternately along the circumferential direction, and a rotor disposed inside or outside the stator, wherein each claw A pole has a first magnetic pole element facing the rotor, a coil inserted between the first magnetic pole element, and a second magnetic pole element magnetically connected to the first magnetic pole element, and The thickness of the second magnetic pole element of each of the claw poles and the downward claw poles is smaller at the distal end than at the proximal end.

In this claw pole motor, since the second pole element located on the opposite side of the rotor has a thickness dimension of the tip portion smaller than that of the proximal end portion, a larger magnetic flux can be concentrated on the first pole element than on the second pole element. If the current flowing through the coil is set to the same size, the efficiency of the rotor can be improved compared to before.

However, as described above, the claw poles shown in Patent Document 1 have different lengths of the claw poles at approximately the center and on both sides of the circumferential direction, so various types of steel plates are required, making the manufacturing process complicated. .

Accordingly, the upward claw pawls are stacked in the circumferential direction of steel plates of the same shape forming an upward U-shape when viewed from the circumferential direction of the stator element, and the downward claw poles have a downward U-shape when viewed from the circumferential direction of the stator element. It is desirable to stack steel plates of the same shape in the circumferential direction.

Through this configuration, the thickness of the tip of the second magnetic pole element of each claw pole can be made smaller than the thickness of the base end without complicating the manufacturing process.

It is preferable that the first magnetic pole element and the second magnetic pole element are formed as separate members, and that each of the first magnetic pole element and the second magnetic pole element is formed by stacking steel plates of the same shape in the circumferential direction of the stator element.

By configuring each magnetic pole element as a separate member in this way, the yield when processing the magnetic pole element can be increased compared to the case where each magnetic pole element is integrated.

In order to further increase the yield, it is preferable that each of the claw poles further includes a third magnetic pole element interposed between the proximal end of the first magnetic pole element and the proximal end of the second magnetic pole element to magnetically connect these magnetic materials. do.

In order to facilitate assembly of the stator, a pair of support members for inserting and supporting the upward claw pole and the downward claw pole and inserting the coil are further provided, and each of the pair of support members includes the It is preferable to form a first positioning portion into which the proximal end of one of the upward claw pole and the downward claw pole is inserted, and a second positioning portion into which the distal end of the other is inserted.

In the case where each claw pole is made of a separate magnetic pole element, a pair of support members are further provided for inserting and supporting the upward claw pole and the downward claw pole and inserting the coil to facilitate assembly of the stator, It is preferable that a plurality of positioning portions into which each of a plurality of magnetic pole elements constituting the claw pole are inserted are formed in each of the pair of support members.

In addition, there are also the following problems.

A conventional motor control circuit is configured to convert, for example, a direct current voltage supplied from a power supply into an alternating current voltage and apply it to the motor by alternately turning on/off each pair of two pairs of transistors arranged diagonally using an H bridge circuit. There is something.

In this configuration, if both pairs of transistors are turned on at the same time, there is a possibility that the transistors may be lost due to a through current flowing at that moment, so one pair of transistors is turned on. A period of time (so-called dead time) during which all transistors are OFF is formed from the state in which the other pair of transistors is turned ON.

However, in the above-described dead time, the energy accumulated in the coil of the motor flows to the parasitic diode of the transistor as a regenerative current, causing a voltage increase in the power supply line due to so-called kick back, causing vibration of the motor and circuit elements. It is known to have a negative effect on

Therefore, the motor control circuit shown in Patent Document 3 keeps the transistor on the ground side in the ON state longer than the transistor on the power supply side among a pair of transistors that switch from ON to OFF. By doing so, the regenerative current is looped on the ground side and the regenerative current is consumed by flowing to the parasitic diode.

The present invention was made as a result of the inventor's in-depth study, and its purpose is to suppress the voltage increase in the power line due to kickback more reliably than before.

That is, the motor control circuit according to the present invention includes an H bridge circuit that has four MOSFETs and supplies power from the power source to the motor; and a driving circuit that outputs a driving signal to each MOSFET and alternately turns on/off each pair of the two MOSFETs arranged diagonally. When switching the pair of MOSFETs from on to off, the control circuit switches the MOSFET on the ground side to off and then switches the MOSFET on the power side to off after a preset time has elapsed.

In this motor control circuit, when switching a pair of MOSFETs from on to off, the MOSFET on the ground side is switched off and then the MOSFET on the power side is switched off after a preset time has elapsed, so the regenerative current A loop that consumes power can be formed on the power supply side.

Accordingly, the regenerative current can be allowed to flow not only through the parasitic diode but also through various circuit elements such as the condenser installed on the power supply side, consuming the regenerative power more efficiently than before, and further reducing the voltage increase in the power supply line due to kickback. It can definitely be suppressed.

In addition, the motor control circuit according to the present invention includes an H bridge circuit including four MOSFETs and supplying power from the power source to the motor; and a driving circuit that outputs a driving signal to each MOSFET and alternately turns on/off the two pairs of MOSFETs arranged diagonally, one pair at a time. In addition, corresponding to each of the two MOSFETs on the power supply side, a pair of MOSFETs for regenerative current consumption are installed in parallel with the MOSFETs on the power supply side, and the driving circuit switches the pair of MOSFETs from on to off. When switching from on to off, the regenerative current consumption MOSFET corresponding to the power supply side MOSFET switches from off to on.

In such a motor control circuit, a loop that consumes regenerative current can be formed on the power supply side by switching the regenerative current consumption MOSFET corresponding to the MOSFET on the power supply side from on to off from off to on, and the above-mentioned Similar effects can be achieved with the composition.

In addition, the motor control circuit according to the present invention includes four MOSFETs, an H bridge circuit that supplies power from the power source to the motor, and a drive signal is output to each MOSFET to turn the four MOSFETs off. A driving circuit is provided to alternately turn on/off the two pairs of MOSFETs arranged diagonally, one pair at a time, through a non-energized state. In such a motor control circuit, when the driving circuit alternately turns on/off the two pairs of MOSFETs arranged on the diagonal, one pair at a time, the driving circuit turns off all the at least four MOSFETs for a preset time to maintain a de-energized state. However, before entering the non-energized state, among the pair of MOSFETs that are ON, the MOSFET on the ground side is switched to OFF and the MOSFET on the power side is kept ON.

In such a motor control circuit, among a pair of MOSFETs that are ON before the de-energized state, the MOSFET on the ground side is switched OFF and the MOSFET on the power supply side is kept ON, thereby enabling regeneration. A loop that consumes current can be formed on the power supply side, and an effect similar to the above-described configuration can be obtained.

It is preferable that the four MOSFETs are NMOSFETs.

With this configuration, compared to the case of using a PMOSFET, the NMOSFET has superior frequency characteristics, so heat generation in the MOSFET can be suppressed during PWM driving.

In addition, the motor according to the present invention includes a rotor; A stator comprising a plurality of stator elements, wherein the stator elements include a plurality of claw poles formed along a circumferential direction of the stator element; It is provided with a coil wound along the circumferential direction of the stator element, wherein the claw pole further 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 magnetic flux. It is provided with a resistance unit to change the flow.

Through this change in magnetic flux due to the resistance unit, the magnetic flux density on the rotor side of each claw pole can be increased, thereby improving the efficiency of the motor.

According to the present invention, for example, even when forming a skew angle on the stator side, an insulating material is not required, so the motor can be miniaturized in the axial direction compared to the prior art and an increase in manufacturing cost can be prevented.

Additionally, according to the present invention, heat generated from the coil can be dissipated without installing a heat radiating member or fan.

In addition, according to the present invention, it is possible to implement a claw pole with a shape in which magnetic flux is concentrated on the motor side, thereby improving the efficiency of the motor.

In addition, according to the present invention, the consumption efficiency of regenerative power can be improved and the voltage increase of the power line due to kickback can be suppressed more reliably than before.

1 is a diagram showing the overall configuration of a single-phase claw pole motor according to an embodiment of the present invention.
Figure 2 is a diagram showing the configuration of a stator element according to an embodiment of the present invention.
Figure 3 is a diagram showing the side configuration of a stator element according to an embodiment of the present invention.
Figure 4 is an experimental result showing the effect of a single-phase claw-pole motor according to an embodiment of the present invention.
Figure 5 is a diagram showing the side configuration of a single-phase claw pole motor according to another embodiment of the present invention.
Figure 6 is a diagram for explaining the direction of magnetic poles formed between the claw poles of a single-phase claw pole mutter.
Figure 7 is a schematic diagram showing the configuration of a conventional single-phase claw pole motor.
Figure 8 is a diagram showing the overall configuration of a single-phase claw pole motor according to another embodiment of the present invention.
Figure 9 is a perspective view schematically showing a part of the rotor of a single-phase claw pole motor according to another embodiment of the present invention.
Figure 10 is a perspective view schematically showing the coil of a single-phase claw pole motor according to an embodiment of the present invention.
Figure 11 is a perspective view schematically showing the stator of a single-phase claw pole motor according to an embodiment of the present invention.
Figure 12 is a perspective view schematically showing the claw pole of a single-phase claw pole motor according to an embodiment of the present invention.
Figure 13 is a perspective view schematically showing a support member of a stator element of a single-phase claw pole motor according to an embodiment of the present invention.
Figure 14 is a perspective view schematically showing the claw pole and support member of a single-phase claw pole motor according to another embodiment of the present invention.
Figure 15 is a perspective view schematically showing the communication path of a single-phase claw pole motor according to an embodiment of the present invention.
Figure 16 is an exploded perspective view schematically showing the stator of a single-phase claw pole motor according to another embodiment of the present invention.
Figure 17 is a perspective view schematically showing a support member of a single-phase claw pole motor according to another embodiment of the present invention.
Figure 18 is a perspective view schematically showing the coil and claw pole of a single-phase claw pole motor according to another embodiment of the present invention.
Figure 19 is a perspective view schematically showing the claw pole of a single-phase claw pole motor according to another embodiment of the present invention.
Figure 20 is a schematic diagram comparing the claw pole of a single-phase claw pole motor according to another embodiment of the present invention and the conventional claw pole.
Figure 21 is a perspective view showing the claw pole of a single-phase claw pole motor according to another embodiment of the present invention.
Figure 22 is a perspective view showing the claw pole of a single-phase claw pole motor according to another embodiment of the present invention.
Figure 23 is a perspective view showing the claw pole of a single-phase claw pole motor according to another embodiment of the present invention.
Figure 24 is a perspective view showing a support member of a single-phase claw pole motor according to another embodiment of the present invention.
Figure 25 is a diagram showing the configuration of a motor control circuit according to an embodiment of the present invention.
Figure 26 is a diagram showing the energization timing of each MOSFET in the motor control circuit according to an embodiment of the present invention.
Figure 27 is a flowchart showing the operation of a motor control circuit according to an embodiment of the present invention.
Figure 28 is a circuit diagram for explaining the flow of regenerative current in a motor control circuit according to an embodiment of the present invention.
Figure 29 is a graph showing the effect of the motor control circuit according to an embodiment of the present invention.
Figure 30 is a diagram showing the configuration of a motor control circuit of a motor control circuit according to another embodiment of the present invention.
Figure 31 is a circuit diagram for explaining the flow of regenerative current in a motor control circuit according to another embodiment of the present invention.

Hereinafter, a single-phase claw pole motor according to an embodiment of the present invention will be described with reference to the drawings.

The single-phase claw-pole motor 100 according to an embodiment of the present invention is used, for example, in a compressor constituting a refrigeration cycle, and as shown in FIG. 1, the stator 20 and the stator 20 can rotate within the stator 20. It has an installed rotor (10).

First, the rotor 10 will be described.

The rotor 10 has a cylindrical shape in which a rotor shaft (not shown) serving as a rotation axis is attached to a vertically penetrating through hole 10H, an iron core 11 in which a plurality of magnet insertion holes are formed along the outer circumference, and a plurality of iron cores 11. It is a so-called embedded magnet type (IPM), which is provided with a plurality of permanent magnets 12 inserted into the magnet insertion hole.

The iron core 11 is formed by stacking a plurality of electromagnetic steel sheets.

The plurality of permanent magnets 12 are arranged in a V-shape with the rotation center as the vertex to form magnetic poles. In Figure 1, eight stimuli are formed. Meanwhile, the number of stimuli may be appropriately changed.

Next, the stator 20 will be described.

The stator 20 has a cylindrical shape in which the rotor 10 is installed in a vertically penetrating through hole 20H so that the rotor 10 can rotate. In Figure 1, a plurality of stator elements 3 are formed by stacking them in the axial direction.

As shown in FIG. 2, the stator element 3 includes an upper core 4a having a plurality of downward claw poles 43a along the circumferential direction of the stator element 3, and A lower core 4b having a plurality of upward claw poles 43b along the upper core 4a and a coil 4c inserted into the lower core 4b and wound in the circumferential direction of the stator element 3. Equipped with

More specifically, as shown in Figures 1 and 2, the upward claw poles 43b and the downward claw poles 43a are arranged alternately in the circumferential direction of the stator element 3, and the upper core 4a and the lower It is combined to insert the coil 4c into the core 4b.

The upper core 4a includes, for example, a disk-shaped substrate portion 41a with a through hole formed in the center, a side plate portion 42a extending axially downward from the outer edge of the substrate portion 41a, and the substrate portion. It is provided with a plurality of downward claw poles 43a extending axially downward from the inner edge of the portion 41a.

Each downward claw pole 43a is formed at equal intervals along the circumferential direction of the stator element 3 and extends lower than the cross section of the side plate portion 42a, and all downward claw poles 43a have, for example, approximately It has the same rectangular shape.

The lower core 4b includes, for example, a disk-shaped substrate portion 41b with a through hole formed in the center, a side plate portion 42b extending axially upward from the outer edge of the substrate portion 41b, and It is provided with a plurality of upward claw poles 43b extending axially upward from the inner edge of the substrate portion 41b. In an embodiment of the present invention, the upper core 4a is configured to be upside down.

Accordingly, each upward claw pole 43b is formed at equal intervals along the circumferential direction of the stator element 3 and extends above the cross section of the side plate portion 42b, and all upward claw poles 43b are, for example, For example, it has the same shape, roughly rectangular.

Meanwhile, in an embodiment of the present invention, as shown in FIG. 1, in a state in which the upper core 4a and the lower core 4b are combined, the tip surface 431 of each upward claw pole 43b and the upper The upper surface 31 of the core 4a is disposed on the same plane, and the tip surface 431 of each downward claw pole 43a and the lower surface 32 of the lower core 4b are disposed on the same plane.

The coil 4c is accommodated in the coil accommodation space formed by each substrate portion 41a, 41b and each side plate portion 42a, 42b by combining the upper core 4a and lower core 4b. Here, the coil 4c has a cylindrical shape formed by winding an insulated conductor in the circumferential direction.

As shown in FIG. 1, the stator 20 of the single-phase claw pole motor 100 according to an embodiment of the present invention is configured by stacking two stator elements 3 described above in the axial direction.

More specifically, the lower surface 32 of one (upper side) stator element 3 is brought into contact with the upper surface 31 of the other (lower side) stator element 3, so that these stator elements 3 are coaxially aligned. Laminate it on.

And, in an embodiment of the present invention, as shown in Figure 3, the coils 4c of the upper and lower stator elements 3 are wound in opposite directions, and the upper downward claw pole 43a and the lower upward The claw poles 43b are arranged to overlap each other when viewed in the axial direction, and the upper upward claw pole 43b and the lower downward claw pole 43a are arranged to overlap each other when viewed in the axial direction.

To explain in more detail, one stator element 3 is stacked upside down with respect to the other stator element 3, and the coils 4c of each stator element 3 are wound in opposite directions.

In this state, one stator element 3 is rotated about the rotation axis by an odd number of claw poles (one) with respect to the other stator element 3. That is, the stator element 3 on one side is arranged to have an angular difference of 180 degrees in electrical angle with respect to the stator element 3 on the other side.

Accordingly, the upper downward claw pole 43a and the lower upward claw pole 43b face each other directly, and the upper upward claw pole 43b and the lower downward claw pole 43a face opposite directions.

According to the single-phase claw pole motor 100 according to an embodiment of the present invention configured as described above, the coils 4c of the adjacent stator elements 3 are wound in opposite directions, as shown in FIG. 3. Even if the contact surfaces of these stator elements 3 are all N-pole or S-pole, short circuit can be prevented without interposing an insulating material between the stator elements 3, and by not interposing an insulating material, the material cost is reduced compared to the prior art. In addition, it is possible to miniaturize the motor 100 in the axial direction.

In addition, the upper downward claw pole 43a and the lower upward claw pole 43b overlap each other when viewed in the axial direction, and the upper upward claw pole 43b and the lower downward claw pole 43a are viewed in the axial direction. Since they are arranged to overlap each other, all claw poles adjacent to each other along the axial direction become N poles or S poles. Therefore, the direction of the magnetic field formed by one stator element 3 and the direction of the magnetic field formed by the other stator element 3 are approximately the same direction, and these magnetic fields do not cancel each other, so the motor's There is no concern that output will deteriorate.

Experimental data showing this is shown in Figure 4.

This experimental data is the result of an experiment comparing a conventional single-phase claw-pole motor and the single-phase claw-pole motor 100 according to an embodiment of the present invention. As this experimental result indicates, a single-phase claw-pole motor according to an embodiment of the present invention It can be seen that the induced voltage of the motor 100 is almost the same as that of the conventional motor, and the output torque of the motor does not decrease.

Meanwhile, the present invention is not limited to the above embodiments.

For example, in the above embodiment, the two stator elements 3, the upper downward claw pole 43a and the lower upward claw pole 43b face each other, and the upper upward claw pole 43b Although the downward claw poles 43a on the lower side are arranged to face opposite directions, as shown in FIG. 5, even if they are arranged so that a predetermined skew angle α is formed in the claw poles 43a and 43b with respect to the axial direction, good night.

To explain more specifically, the upper downward claw pole 43a and the lower upward claw pole 43b may be at least partially overlapped with each other when viewed in the axial direction. In addition, the upper upward claw pole 43b and the lower downward claw pole 43a may at least partially overlap each other when viewed in the axial direction.

In addition, the upward claw poles 43b and downward claw poles 43a, which overlap each other when viewed from the axial direction, are arranged to be offset along the circumferential direction with respect to the axial direction, so that a predetermined skew angle is established between the claw poles 43a and 43b. (α) is formed.

According to the single-phase claw pole motor 100 configured in this way, as shown in FIG. 6, a skew angle α can be formed on the stator 20 side without forming an insulating material between the stator elements 3, and cogging Cogging torque can be reduced.

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

Additionally, the rotor in the above embodiment is of the embedded magnet type, but may also be of the surface magnet type or spoke type.

In addition, the single-phase claw-pole motor of the above embodiment is an inner rotor type in which the rotor is located inside the stator, but may be an outer rotor type in which the rotor is located outside the stator.

Next, the claw pole motor according to the present invention will be described with attention to one stator element.

As shown in FIG. 8, the single-phase claw-pole motor 100 according to an embodiment of the present invention includes a rotor 10, a coil 4c, and a stator 20, and is, for example, a compressor constituting a refrigeration cycle. It is a single phase claw pole motor used for.

As shown in FIGS. 8 and 9, the rotor 10 has a cylindrical shape in which a rotor shaft (RS) serving as a rotation axis is attached to a through hole 10H penetrating upward and downward, and a plurality of magnet insertion holes are provided along the outer circumference. It is a so-called embedded magnet type (IPM), which is provided with an iron core 11 formed and a plurality of permanent magnets 12 inserted into a plurality of magnet insertion holes.

These rotors 10 and rotor shaft RS are rotatably supported with respect to the stator 20 by bearings B.

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

As shown in FIG. 10, the coil 4c according to an embodiment of the present invention is formed by pre-winding the lead wire L with a predetermined circumferential length and a predetermined number of turns so as to have a predetermined height dimension. Specifically, the coil 4c is formed using a jig. The lead wire L is aligned and wound using a wire, etc., and then impregnated with an adhesive in this state, or the adhesive is applied to the surface and hardened.

As shown in FIG. 11, the stator 20 is installed so that the rotor 10 can rotate within a through hole 20H penetrating upward and downward, and includes a plurality of upward claw poles 43b and a plurality of downward claw poles. It is provided with (43a) and a pair of lower support members 23 and upper support members 24 that support the claw poles 43b and 43a and accommodate the coil 4c.

The upward claw poles 43b and downward claw poles 43a are formed intermittently alternating with each other along the circumferential direction. In this embodiment, each upward claw pole 43b has the same shape and is formed at equal intervals along the circumferential direction. Additionally, each of the downward claw poles 43a is a vertically reversed version of the upward claw pole 43b, has the same shape, and is formed at equal intervals along the circumferential direction. More specifically, the upward claw pole 43b forms an upward U-shape when viewed in the circumferential direction, and the downward claw pole 43a forms a downward U-shape when viewed in the circumferential direction.

As shown in FIG. 12, each claw pole (43b, 43a) is made by stacking a plurality of steel plates (20x) in the circumferential direction. Here, the U-shaped steel plates (20x) when viewed from the plane have the same shape. A plurality of plates are stacked, and in this state, these steel plates (20x) are bonded together with, for example, an adhesive or varnish.

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

In FIG. 12, the portion indicated by reference numeral 20t is the tip of the claw poles 43b and 43a, and the portion indicated by reference numeral 20b is the proximal end of the claw poles 43b and 43a.

The lower support member 23 and the upper support member 24, which support the claw poles 43b and 43a, are made of an insulating material such as resin, which is a non-magnetic material here.

The lower support member 23 and the upper support member 24 according to an embodiment of the present invention have the same shape, and the lower support member 23 will be described below as a representative of them.

As shown in FIGS. 13 and 14, the lower support member 23 has a circular plate shape with a through hole 23H formed at the center, and the coil 4c is arranged so that the central axes coincide.

The lower support member 23 according to an embodiment of the present invention has a plurality of positioning portions 231 and 232 that determine the positions of the upward claw pole 43b and the downward claw pole 43a. More specifically, the lower support member 23 includes a first positioning portion 231 into which the proximal end 20b of the upward claw pawl 43b is inserted to determine the position of the upward claw pawl 43b, The tip portion 20t of the downward claw pawl 43a is provided with a second positioning portion 232 that is inserted to determine the position of the downward claw pawl 43a. On the other hand, in the upper support member 24, the proximal end 20b of the downward claw pawl 43a is inserted into the first positioning portion 231, and the upward claw pawl 43b is inserted into the second positioning portion 232. The tip portion 20t of is inserted.

These first positioning portions 231 and second positioning portions 232 are formed alternately and intermittently along the circumferential direction, and are formed on the opposing surface (X) of the lower supporting member 23 with the upper supporting member 24. It is a concave part formed in .

More specifically, the first positioning portion 231 has a rectangular shape formed from the inner edge to the outer edge of the lower support member 23 so that the base end 20b of the upward claw pole 43b is inserted without shaking. It is a concave part of . In addition, the second positioning portion 232 is formed on each of the inner and outer edges of the lower support member 23 so that the tip portions 20t on both sides of the downward claw pole 43a are inserted without shaking. It is a pair of rectangular recesses.

In this embodiment, as shown in Fig. 14, the depth dimension of the first positioning portion 231 is smaller than the height dimension of the base end 20b (see Fig. 12) of the upward claw pole 43b. Accordingly, with the upward claw pawl 43b inserted into the first positioning portion 231, the upward surface 20U of the base end 20b of the upward claw pawl 43b is aligned with the lower support member 23. ) is located above the opposing surface (X).

By the above-described configuration, as shown at the top of FIG. 15, the coil 4c inserted between the lower support member 23 and the upper support member 24 (see FIG. 11) has the upward claw pole 43b and the downward claw pole 43b. It contacts the claw pole 43a, and an air layer S is 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 an embodiment of the present invention have an opposing portion M (hereinafter referred to as the coil opposing portion M) with the coil 4c. ) and a second opening (P2) formed in a portion (N) not facing the coil 4c (hereinafter referred to as a coil non-facing portion (N)). , and a communication path PL that communicates these first openings P1 and second openings P2.

As described above, the lower support member 23 and the upper support member 24 have the same shape, and the communication path PL formed in the lower support member 23 will be described below.

The first opening (P1) is open in the air layer (S) formed between the lower support member 23 and the coil (4c), and the second opening (P2) is a space different from the air layer (S). It is opened in That is, the communication path PL communicates with the air layer S and a space separate from the air layer S.

Here, the communication path PL is a concave groove formed from the coil opposing portion M to the non-coil opposing portion N of the lower support member 23. The concave groove, which is the communication path PL, extends radially outward from the coil opposing portion M to the outer edge of the lower support member 23, and in this embodiment, a plurality of communication paths PL are formed radially. do.

As shown in the upper part of FIG. 15, the second opening P2 according to the embodiment of the present invention is located at the coil opposing portion in the opposing surface It is formed from the outside of (M) to the lateral peripheral surface of the lower support member 23.

Meanwhile, in an embodiment of the present invention, as shown in FIG. 13, a plurality of communication paths PL are provided, one for every other pair, between the first positioning unit 231 and the second positioning unit 232 that are adjacent to each other. However, the position or number of communication paths PL formed may be appropriately changed.

Here, the assembly method of the single-phase claw pole motor 100 according to an embodiment of the present invention will be briefly described with reference to FIG. 16.

First, the plurality of upward claw poles 43b are inserted into the first positioning portion 231 of the lower support member 23 to form the lower stator element 201, and the plurality of downward claw poles 43a are inserted into the upper support member 23. It is inserted into the first positioning portion 231 of the member 24 to form the upper stator element 202.

Next, the coil 4c is inserted into the lower stator element 201 and the upper stator element 202, and the tip portion 20t of the upward claw pole 43b is aligned with the second positioning portion ( 232), and the tip portion 20t of the downward claw pole 43a is inserted into the second positioning portion 232 of the lower support member 23.

Then, with the rotor 10 disposed within the stator 20, the top and bottom of the stator 20 are fixed using fixing members Z such as bolts made of a material such as resin, which is an insulating material. Meanwhile, as the fixing member Z, in addition to bolts, for example, screws, nuts, washers, etc. made of resin, which is an insulating material, may be used.

According to the single-phase claw pole motor 100 according to an embodiment of the present invention configured as described above, the lower support member 23 and the upper support member 24 span from the coil opposing portion (M) to the coil non-opposing portion (N). Since it has a plurality of extending communication paths (PL), the coil 4c can be cooled using the air flowing into the communication paths (PL).

In addition, the heat of the coil 4c is released to 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 communication path ( Since PL) is in communication with this air layer (S), sufficient heat dissipation space for the coil (4c) can be secured.

In addition, since the concave groove PL is formed in the existing lower support member 23 and upper support member 24, it is possible to install a separate heat dissipation member or fan, etc., without causing an increase in cost or an increase in the size of the motor. It is possible to cool the coil 4c.

In addition, since the lower support member 23, the upper support member 24, and the fixing member Z are formed of an insulating material, the amount of magnetic material for constructing the single-phase claw pole motor 100 can be reduced. Accordingly, since magnetic paths are not formed in the insulating material, iron losses such as hysteresis loss and eddy current loss can be significantly reduced, and high efficiency of the single-phase claw-pole motor 100 can be achieved.

However, since the plurality of claw poles 43b, 43a and the support members 23, 24 are composed of separate members, it may be considered difficult to assemble the single-phase claw pole motor 100. However, since each support member 23, 24 has a plurality of positioning portions 231, 232 into which a plurality of claw poles 43b, 43a are inserted to determine the positions of the claw poles 43b, 43a, each A plurality of claw poles 43b and 43a can be easily attached to the support members 23 and 24.

In addition, since the coil 4c is formed by previously fixing the lead wire L into a cylindrical shape, the coil 4c can be easily attached to the support members 23 and 24 to which a plurality of claw poles 43b and 43a are attached. You can.

As such, the single-phase claw-pole motor 100 according to an embodiment of the present invention does not cause structural complexity or lower productivity.

Meanwhile, the present invention is not limited to the above embodiments.

Although the communication path PL in the above embodiment has a concave groove shape, the communication path PL has a shape in the lower support member 23 (or upper support member 24), for example, as shown at the top of FIG. 17. A slit may be formed from a part facing the coil 4c to a part not facing the coil 4c.

In addition, as shown at the bottom of FIG. 17, the communication path PL is a through hole that penetrates the opposing portion of the lower support member 23 (or upper support member 24) with the coil 4c in the thickness direction. It's okay to continue.

In addition, in the above embodiment, both the lower support member 23 and the upper support member 24 have a communication path PL, but the communication path is connected only to either the lower support member 23 or the upper support member 24. A furnace (PL) may be formed.

In addition, the communication path PL in the above embodiment extends radially outward from the portion opposite to the coil 4c, but may extend radially inward and does not necessarily have to be straight.

In addition, since there is a concern that the mechanical strength of each support member 23 and 24 may be reduced by forming the communication path PL described above compared to the case where the communication path PL is not formed, the support members 23 and 24 are It may be formed of an insulating material with higher strength than resin, and for example, a strength-enhancing material such as glass fiber may be added.

Next, a single-phase claw-pole motor of other embodiments will be described.

The single-phase claw-pole motor in this embodiment is characterized by a claw-pole, and the other configuration is the same as the above-mentioned embodiment, so the claw-pole, which is a characteristic part, will be described in detail below.

In this embodiment, as in the above embodiment, the upward claw poles 43b each have the same shape, and the downward claw poles 43a each have the same shape.

Below, the upward claw pole 43b will be described as a representative of these.

As shown in FIGS. 18 and 19, the upward claw pole 43b holds a first magnetic pole element 211 facing the rotor 10 and a coil 4c between the first magnetic pole element 211. A third magnetic pole element ( 213) is provided.

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

More specifically, the third magnetic pole element 213 is formed between the proximal end 211b of the first magnetic pole element 211 and the proximal end 212b of the second magnetic pole element 212 and has the upward claw pole ( 43b) forms an upward U-shape when viewed from the circumferential direction of the stator element 3.

In addition, the upward claw pole 43b of this embodiment is configured so that the tip 212t of the second magnetic pole element 212 serves as a resistance to the magnetic flux, and the magnetic flux is more concentrated on the proximal end 212b than on the tip 212t. In the upward claw pole 43b, the second magnetic pole element 212 formed on the opposite side of the rotor is configured such that the tip portion 212t has a thickness smaller than the thickness dimension of the proximal end portion 212b. That is, the shape of the tip portion 212t of the second magnetic pole element 212 is implemented as a resistance portion where the resistance of the magnetic flux increases, so that the magnetic flux can be more concentrated. On the other hand, as an example of concentrating the magnetic flux more on the proximal end 212b than on the distal end 212t, in addition to making the thickness of the distal end 212t smaller than the thickness of the proximal end 212b, for example, the proximal end 212b It is conceivable that the tip portion 212t be made into a member that makes it more difficult for magnetic flux to pass through, or that the number of steel plates 20x of the tip portion 212t be reduced to less than that of the proximal end portion 212b.

Meanwhile, the thickness dimension referred to here is the radial length in the assembled state of the single-phase claw pole motor 100, that is, in the state in which the upward claw pole 43b is supported by the lower support member 23.

Specifically, the second magnetic pole element 212 has a constant thickness from the bottom to a predetermined height, and the thickness gradually decreases from the predetermined height toward the front end surface, and the front end surface of the second magnetic pole element 212 has It is the same height as the front end surface of the first magnetic pole element 211.

Here, the coil opposing surface 212a of the second magnetic pole element 212 facing the coil 4c is inclined away from the coil 4c from the proximal end 212B side toward the distal end 212t side. With this configuration, the space between the second magnetic pole element 212 and the coil 4c can be increased and magnetic flux can be prevented from leaking from the second magnetic pole element 212 to the coil 4c.

Meanwhile, the first magnetic pole element 211 according to this embodiment is configured to have a substantially constant thickness dimension from the base end 211b to the tip 211t.

According to the single-phase claw pole motor 100 configured as described above, the second magnetic pole element 212 located on the opposite side of the rotor is configured so that the thickness of the tip portion 212t is smaller than the thickness of the proximal end 212b, As shown in FIG. 20, the magnetic flux can be concentrated on the first magnetic pole element 211 rather than the second magnetic pole element 212, and when the current flowing through the coil 4c is set to the same size, the motor can be more efficient than before. .

In addition, since the thickness of the second magnetic pole element 212 is made smaller at the tip 212t than at the base end 212b, compared to the case where the thickness dimension is constant from the base end 212b to the tip 212t, the thickness of the second magnetic pole element 212 is smaller than that at the tip 212t. (212) The overall magnetic flux decreases. Accordingly, the cogging torque can be reduced because the suction force generated between each claw pole 43a and 43b and the rotor is reduced.

In addition, since the upward claw pole 43b and the downward claw pole 43a have the same shape, and each claw pole 43b, 43a is made of a single-shaped steel plate 20x, assembly work is facilitated and manufacturing is facilitated. Simplification of the process can be achieved.

Meanwhile, the present invention is not limited to the above embodiments.

For example, the upward claw pole 43b of the above embodiment is formed by integrally forming the first magnetic pole element 211, the second magnetic pole element 212, and the third magnetic pole element 213, but the upward claw pole 43b may be composed of a plurality of separate stimulus elements.

Specifically, as shown in FIG. 21, the first magnetic pole element 211 is formed by laminating L-shaped steel plates 20x (i.e., the first magnetic pole element 211 and the third magnetic pole element 213 are integrated ), and the second magnetic pole element 212 may be formed by stacking steel plates 20x in a rectangular shape (strip shape). Of course, on the contrary, even if the first magnetic pole element 211 is a lamination of rectangular-shaped (strip-shaped) steel plates 20x, and the second magnetic pole element 212 is a lamination of L-shaped steel plates 20x good night.

In addition, as shown in FIG. 22, the first stimulation element 211, the second stimulation element 212, and the third stimulation element 213 are separate members, and the first stimulation element 211 and the third stimulation element 213 The element 213 may be formed by stacking steel plates 20x in a rectangular shape (strip shape).

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

In addition, in the above embodiment, the second magnetic pole element 212 has a constant thickness from the bottom to a predetermined height, and is configured to gradually decrease in thickness from the predetermined height toward the front end surface. However, as shown in FIG. 23, the second magnetic pole element 212 may have a step-shaped step portion 212x formed in the thickness direction at the rectangular tip portion 212t.

In addition, as described above, when the claw poles 43b and 43a are composed of a plurality of separate magnetic pole elements, as shown in FIG. 24, the support members 23 and 24 are provided so that each magnetic pole element is inserted. It is desirable to have a plurality of positioning units 233.

Additionally, by integrally housing each magnetic pole element in advance in these positioning portions 233, the assembly of the single-phase claw-pole motor 100 can be further simplified.

In addition, in the above embodiment, the first magnetic pole element 211 is configured to have an approximately constant thickness dimension from the proximal end 211b to the tip 211t, but in order to further increase the magnetic flux density of the first magnetic pole element 211, the proximal end portion 211 It may be configured so that the thickness of the tip portion 211t is larger than the thickness of 211b.

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

The motor control circuit 100z according to an embodiment of the present invention is for driving a single-phase motor Mz, for example, and as shown in FIG. 25, for example, direct current power supplied from the direct current power supply 10z is converted into alternating current power. It is converted into electric power and applied to the motor (Mz).

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

Specifically, this motor control circuit (100z) includes a backflow prevention diode (D1) installed on the high-voltage side of the DC power supply (10z), a smoothing condenser (Cz) installed in parallel with the DC power supply (10z), and the DC power supply (10z). ) is provided with an H bridge circuit (20z) that converts the direct current power supplied from do.

The H bridge circuit 20z includes four MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) with parasitic diodes D, and here, all four MOSFETs are N-channel MOSFETs.

More specifically, this H bridge circuit 20z has a first MOSFET 2a and a second MOSFET 2b connected in series to the DC power supply 10z, and a first MOSFET 2b connected in series to the DC power supply 10z. and a third MOSFET (2c) and a fourth MOSFET (2d), wherein the first MOSFET (2a) and the second MOSFET (2b) and the third MOSFET (2c) and the fourth MOSFET (2d) are connected in parallel. . A coil of the motor Mz is connected between the connection points of the first MOSFET 2a and the second MOSFET 2b and the connection points of the third MOSFET 2c and the fourth MOSFET 2d.

Hereinafter, for convenience of explanation, the first MOSFET (2a) and the third MOSFET (2c) are referred to as the power-side MOSFET (2x), and the second MOSFET (2b) and the fourth MOSFET (2d) are referred to as the ground-side MOSFET (2y). It is said that

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

More specifically, this driving circuit 30 alternately turns on/off two pairs of MOSFETs arranged diagonally, one pair at a time. In other words, in the driving circuit 30, as shown in FIG. 26, the first MOSFET 2a and the fourth MOSFET 2d are ON and the second MOSFET 2b and the third MOSFET 2c are ON. A first energized state is OFF, the first MOSFET (2a) and the fourth MOSFET (2d) are OFF, and the second MOSFET (2b) and the third MOSFET (2c) are ON. Switches the second energizing state.

The driving circuit 30 of the motor control circuit according to an embodiment of the present invention may have, for example, a non-energized state (so-called dead time) in which all four MOSFETs are off between the first energized state and the second energized state. It is configured to form for microseconds (μs).

And, as shown in FIG. 26, when switching the pair of MOSFETs from on to off, this driving circuit 30 switches the ground side MOSFET 2y off and then turns on the power side after a predetermined time has elapsed. It is configured to turn off the MOSFET (2x).

That is, before the de-energized state, the driving circuit 30 switches the ground side MOSFET (2y) to off among the pair of MOSFETs that are ON, and also turns on the power supply side MOSFET (2x). keep it as

With this configuration, in this embodiment, the ground-side MOSFET (2y) is energized at, for example, 160° to 170°, and the power-side MOSFET (2x) is energized at, for example, 178°.

Hereinafter, the operation of the driving circuit 30 of the motor control circuit according to an embodiment of the present invention will be described in more detail with reference to the flow chart of FIG. 27.

When a control signal for rotating the motor Mz is input from the outside, the drive circuit 30 acquires this control signal and first switches the first MOSFET 2a and the fourth MOSFET 2d from off to on at the same time. (S1).

Next, among the MOSFETs that are ON, the fourth MOSFET (2d), which is the ground side MOSFET (2y), is switched from on to off (S2). Accordingly, as shown at the top of FIG. 28, the regenerative current indicated by the thick arrow flows through the parasitic diode (D) of the third MOSFET (2c) and the loop formed by the first MOSFET (2a), and a portion of it flows through the smoothing capacitor. flows in

Then, after switching the fourth MOSFET (2d) off, the first MOSFET (2a), which is the power supply side MOSFET (2x), is switched from on to off after a predetermined time (S3), for example, for several μs. Set to a non-energized state in which the four MOSFETs are turned off (S4).

Subsequently, the second MOSFET (2b) and the third MOSFET (2c) are simultaneously switched from off to on (S5).

Then, as in S2 to S4, among the MOSFETs that are ON, the second MOSFET (2b), which is the ground side MOSFET (2y), is switched from on to off (S6), as shown at the bottom of FIG. 28. The regenerative current indicated by the thick arrow flows through the loop formed by the parasitic diode (D) of the first MOSFET (2a) and the third MOSFET (2c), and a portion of it flows into the smoothing capacitor (Cz).

Then, after switching the second MOSFET (2b) off, the third MOSFET (2c), which is the power supply side MOSFET (2x), is switched from on to off after a predetermined time (S7), for example, for several μs. Set to a non-energized state with the four MOSFETs turned off (S8).

Afterwards, S1 to S8 are repeated, but when a control end signal to stop the motor (Mz) is input from the outside (S9), the driving circuit 30 acquires the control end signal and turns off each MOSFET to stop the motor (Mz). terminates control.

According to the motor control circuit 100z according to the embodiment of the present invention configured as described above, when switching a pair of MOSFETs from on to off, a predetermined time elapses after switching the ground side MOSFET 2y off. Since the MOSFET (2x) on the power supply side is turned off, the regenerative current accumulated in the coil of the motor (Mz) can be looped and consumed on the power supply (10z) side.

Accordingly, the regenerative current can flow to various circuit elements such as the parasitic diode (D) of the power supply side MOSFET (2x) as well as the smoothing condenser (Cz) installed on the power supply (10z) side, and the regenerative power is consumed efficiently. In addition, as shown in FIG. 29, the voltage rise of the power supply line due to kickback can be suppressed more reliably than before.

In addition, since the four MOSFETs that make up the H bridge circuit (20z) are all N-channel MOSFETs, compared to the H bridge circuit using P-channel MOSFETs, the heat generated when the regenerative current flows through the parasitic diode (D) is reduced. It can be suppressed.

Meanwhile, the present invention is not limited to the above embodiments.

For example, as shown in FIG. 30, the motor control circuit 100z includes a pair of MOSFETs for regenerative current consumption installed in parallel with the corresponding power MOSFETs 2x, corresponding to each of the two power MOSFETs 2x. (2z) may be further provided.

In this configuration, the drive circuit 30 switches a pair of MOSFETs arranged diagonally from on to off, as shown in FIG. 30, and also switches the power supply side MOSFET 2x, which switches from on to off, It may be configured to switch the corresponding regenerative current consumption MOSFET (2z) from off to on.

According to the motor control circuit 100z configured as described above, the regenerative current consumption MOSFET 2z corresponding to the power supply side MOSFET 2x is switched from on to off, thereby switching from off to on, as in the above embodiment. As shown in Figure 31, a loop that consumes the regenerative current indicated by the thick arrow can be formed on the power supply (10z) side, and regenerative power can be consumed more reliably than before, and the voltage rise of the power supply line due to kickback is reliably suppressed. It becomes possible to do so.

The drive circuit may be configured to control the power supply side MOSFET by pulse width modulation (PWM), for example.

Additionally, in the above embodiment, a pair of MOSFETs arranged diagonally are switched from off to on at the same time, but these pairs of MOSFETs may be switched from off to on with a time difference.

Additionally, although the motor control circuit of the above embodiment is used to control an alternating current motor, it may also be used to control a direct current motor.

In addition, the present invention is not limited to the above embodiments, and it goes without saying that various modifications are possible without departing from the spirit thereof.

100: Claw pole motor
10: rotor
20: Stator
3: Stater element
4a: upper core
4b: lower core
4c: coil
43a: Downward claw fall
43b: upward claw pole

Claims (18)

Including a stator having a plurality of stator elements,
The stator element is:
a plurality of claw poles formed along a circumferential direction of the stator element;
Provided with a coil wound along the circumferential direction of the stator element,
The winding directions of coils of neighboring stator elements among the plurality of stator elements are opposite to each other,
The plurality of claw poles of the neighboring stator elements are arranged to face each other, and the opposing claw poles are arranged to have the same polarity,
Each of the plurality of clawpoles further comprises a first irritant element and a second irritant element,
At least one of the first magnetic pole element and the second magnetic pole element is provided with a resistance portion for changing the flow of magnetic flux,
The second pole element of the claw pole has a thickness dimension of the tip portion that is smaller than the thickness dimension of the proximal portion,
A motor in which the tip surface of the tip of the first magnetic pole element and the tip surface of the tip of the second magnetic pole element are located at the same level. According to claim 1,
A motor wherein the plurality of claw poles are arranged so that a predetermined skew angle is formed between the opposing claw poles of the neighboring stator elements. The method of claim 1, wherein the stator element is:
Further comprising a pair of support members supporting the claw pole and receiving the coil,
A motor in which a communication path is formed in at least one of the pair of support members. According to claim 3,
The motor wherein the communication path communicates a first opening formed in a portion facing the coil and a second opening formed in a portion not facing the coil. According to claim 3,
A motor wherein the communication path is in the form of at least one of a concave groove, a slit, and a through hole. According to claim 5,
When the communication path is in the shape of the concave groove and the slit, the communication path is formed from a part facing the coil to a part not facing the coil. According to claim 3,
A motor wherein the support member is made of a non-magnetic material. According to claim 3,
The claw pole consists of an upward claw pole and a downward claw pole;
A motor wherein each of the pair of support members is formed with a first positioning portion into which one of the upward claw poles and the downward claw pole is inserted, and a second positioning portion into which the other distal end is inserted. According to claim 3,
The claw pole consists of an upward claw pole and a downward claw pole;
A motor in which a plurality of positioning portions are formed in each of the pair of support members into which each of a plurality of magnetic pole elements constituting the claw pole is inserted. delete According to claim 1,
further comprising a rotor;
the first pole element of the claw pole is arranged to face the rotor;
The second magnetic pole element of the claw pole is magnetically connected to the first magnetic pole element, and is provided to receive the coil together with the first magnetic pole element. According to claim 1,
The second magnetic pole element of the claw pole is provided so that magnetic flux is more concentrated at the proximal end than at the tip. delete According to claim 1,
The motor of the second magnetic pole element of the claw pole is formed so that the coil opposing surface facing the coil gradually becomes farther away from the coil as it moves from the proximal end toward the distal end. According to claim 1,
The second magnetic pole element of the claw pole is a motor whose tip is formed in a step shape. According to claim 1,
The claw pole consists of an upward claw pole and a downward claw pole;
The upward claw pole is made by stacking steel plates of the same shape forming an upward U-shape in the circumferential direction when viewed from the circumferential direction of the stator element,
The downward claw pole is a motor in which steel plates of the same shape forming a downward U-shape when viewed from the circumferential direction of the stator element are laminated in the circumferential direction. According to claim 1,
A motor in which the first magnetic pole element and the second magnetic pole element are composed of separate members, and each of the first magnetic pole element and the second magnetic pole element is made by stacking steel plates of the same shape in the circumferential direction of the stator element. According to claim 1,
The claw pole further includes a third magnetic pole element interposed between the proximal end of the first magnetic pole element and the proximal end of the second magnetic pole element to magnetically connect the first magnetic pole element and the second magnetic pole element.

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