JP6781370B2 - motor - Google Patents

Description

The present invention relates to a motor that has been subjected to cogging torque.

For example, as a motor of this type, Patent Document 1 states that a secondary side member having teeth formed at equal intervals along the traveling direction and a secondary side member that can freely move with respect to the traveling direction of the secondary side member. A linear motor composed of an arranged primary side member and a coil wound around a magnetic pole portion to generate a magnetic flux in the primary side member is shown. Then, by sequentially generating magnetic flux in each gap formed between the magnetic pole portion of the primary side member and the tooth portion of the secondary side member, the primary side member is moved relative to the secondary side member. It has become. Further, in order to obtain a large thrust, each magnetic pole portion of the primary side member is composed of a plurality of magnetic poles, and permanent magnets are inserted in the gaps of the respective magnetic poles so as to have opposite polarities. The magnetic pole portion is composed of a magnetic pole and a permanent magnet.

FIG. 20 is a block diagram of the magnetic pole portion. The tooth portions 1a are evenly formed on the secondary side member 1 of the magnetic material along the traveling direction. On the other hand, the primary side member 13 is arranged at a position facing the secondary side member 1 with a predetermined gap 2 in between. The primary side member 13 is formed in an E shape by connecting the magnetic pole portions 13a, the magnetic pole portions 13b, and the magnetic pole portions 13c with a yoke 13d, and the magnetic poles 10 are formed at equal intervals in the respective magnetic pole portions 13a, 13b, and 13c. A permanent magnet 14 is inserted in the gap so that adjacent polarities have opposite polarities. Further, a coil 15a is wound around the magnetic pole portion 13a, a coil 15b is wound around the magnetic pole portion 13b, and a coil 15c is wound around the magnetic pole portion 13c.

Japanese Unexamined Patent Publication No. 2006-109639

However, in such a configuration, focusing on the magnetic pole portions 13a-13b and 13b-13c, as shown in FIG. 21, there is a path through which the magnetic flux H leaks between the magnetic poles 10 and 10 of the adjacent phases. On the other hand, the magnetic poles 10 at the outer ends of the magnetic pole portions 13a and 13c in the left and right phases do not have leakage flux to the adjacent magnetic pole portions, and as shown in FIG. 22, the magnetic flux flowing from the magnetic pole surface to the secondary side is larger. Become.

As a result, the magnetic flux interlinking to the secondary side only at the outer ends of the magnetic pole portions 3a and 3b at both ends of the primary side member 13 increases, so that an imbalance of the magnetic flux occurs and cogging increases. It became clear.

Therefore, in order to solve such a problem, for example, those shown in Patent Document 2 (Patent No. 5418556) are referred to. As an issue in this document, in a conventional linear motor in which a permanent magnet is arranged on the mover side which is a primary side member, when the mover is moved along a stator which is a secondary side member, it is a factor of thrust fluctuation. It is pointed out that the smooth driving of the linear motor is hindered due to the occurrence of cogging and thrust ripple. Then, a stator having teeth formed at predetermined intervals along the traveling direction and a mover arranged so as to face the stator are provided, and the mover has a plurality of magnetic poles arranged in a linear shape. A coil is wound around each of the main pole magnets, and main pole magnets of different polarities are arranged alternately along the arrangement direction of the magnetic poles to form a main pole magnet row. The auxiliary pole magnets are arranged, and the auxiliary pole magnets are arranged on the end side of the mover from the coil wound around each of the plurality of magnetic poles in the arrangement direction of the magnetic poles, and at the end portion (rear end portion). It is stated that the bias of the magnetic flux density is reduced.

That is, the one in the same document shows that if a complementary pole structure is formed on the outside of the coils at both ends, the magnetic flux density can be adjusted by the end effect.

However, if the auxiliary pole magnets are provided on the outside of the coils at both ends, the mover becomes longer by that amount. For this reason, the number of types of parts increases, and the size and weight of the mover in the moving direction are inevitably increased. Moreover, since there is no standard as to where to change the magnetic flux density at the end, there is a risk of having to think and make mistakes about how to configure the auxiliary pole.

The present invention has been made in view of the above problems, and provides a motor having a new configuration capable of accurately solving the occurrence of cogging and the like without inviting a large weight of the primary side member. The purpose is to do.

The present invention has taken the following measures in order to achieve such an object.

That is, the motor of the present invention can freely move relative to the traveling direction of the secondary side member made of a magnetic material in which tooth portions are formed at predetermined intervals along the traveling direction. A motor including an arranged primary side member, wherein each of the primary side members has a plurality of magnetic poles, and a plurality of magnetic pole portions arranged at intervals along the traveling direction, and a plurality of magnetic pole portions thereof. A plurality of permanent magnets provided along the arrangement direction of the magnetic poles of the above and sequentially arranged so as to have opposite polarities, and magnetic flux is generated in a direction intersecting the arrangement direction by being wound around each of the plurality of magnetic poles. and a coil for the coil while being wound over the one end and the other end of each of the plurality of magnetic pole portions constitute two or more different phases to said plurality of magnetic pole portions, each The magnetic pole is connected to the yoke at an end opposite to the end facing the secondary member via a bridge narrower than the width along the traveling direction of the magnetic pole, and the traveling direction end. By making the size of the bridge connected to the outer end magnetic pole, which is the magnetic pole located at one end of the magnetic pole portion located in the portion, and the size of the bridge connected to the other magnetic poles different from each other. and the magnetic flux density of the magnetic flux flowing into the secondary side member from the outer end magnetic pole, magnetic flux to substantially coincide with the magnetic flux of the magnetic flux density flowing in the secondary-side member from the magnetic pole existing in a boundary position between the phases located inside than It is characterized by providing a density adjusting unit.
As a specific embodiment, the magnetic flux density adjusting unit has a magnetic pole having a bridge width of a bridge connected to a magnetic pole located at an end or a bridge length in a direction orthogonal to the bridge width at a boundary position between the phases. Examples thereof include those configured by being wider or shorter than the bridge width or bridge length of the bridge connected to the bridge.
Further, in another aspect, the motor of the present invention can freely refer to a secondary side member made of a magnetic material in which tooth portions are formed at predetermined intervals along the traveling direction and the traveling direction of the secondary side member. A motor including a primary side member arranged so as to be able to move relative to each other, each of the primary side member having a plurality of magnetic poles, and a plurality of plurality of members arranged at intervals along the traveling direction. A magnetic pole portion, a plurality of permanent magnets provided along the arrangement direction of the magnetic pole portions and sequentially arranged so as to have opposite polarities, and wound around each of the plurality of magnetic pole portions to intersect the arrangement direction. With a coil that generates magnetic flux in the direction, the coil is wound over one end and the other end of each of the plurality of magnetic pole portions, and forms two or more different phases on the plurality of magnetic pole portions. By making the size of the outer pole, which is the magnetic pole located at one end of the magnetic pole located at the end in the traveling direction, and the size of the other magnetic poles different from each other, the outer end and the magnetic flux density of the magnetic flux flowing into the secondary side member from the magnetic pole, the phase between the magnetic flux density adjustment unit for substantially coincide with the magnetic flux density of the magnetic flux flowing in the secondary-side member from the magnetic pole existing in boundary position located inside than Is characterized by the provision of.
In still another embodiment, the motor of the present invention is freely relative to a secondary side member made of a magnetic material in which tooth portions are formed at predetermined intervals along the traveling direction and the traveling direction of the secondary side member. A motor including a primary side member arranged so as to be movable, the primary side member each having a plurality of magnetic poles, and a plurality of magnetic poles arranged at intervals along the traveling direction. A plurality of permanent magnets provided along the arrangement direction of the magnetic pole portions and sequentially arranged to have opposite polarities, and a direction in which the magnets are wound around each of the plurality of magnetic pole portions and intersect with the arrangement direction. The coil is wound around one end and the other end of each of the plurality of magnetic poles, and the plurality of magnetic poles form two or more different phases. The size of the permanent magnet provided between the outer end magnetic pole, which is the magnetic pole located at one end of the magnetic pole portion located at the end in the traveling direction, and the magnetic pole located inside the magnetic pole, and the other permanent magnets. By making the sizes of the magnets different from each other, the magnetic flux density of the magnetic flux flowing from the outer end magnetic pole to the secondary side member and the magnetic pole to the secondary side member existing at the boundary position between the phases located inside the outer end magnetic poles. characterized in that the magnetic flux density of the magnetic flux provided magnetic flux density adjuster to substantially coincide flowing into.

Here, when the coil is wound around one end and the other end of each of the plurality of magnetic pole portions, the coil is wound so as to orbit the one end side magnetic pole and the other end side magnetic pole among the magnetic poles constituting the magnetic pole portion. In addition to the mode in which the coil is wound, the mode in which the coil is wound for each magnetic pole constituting the magnetic pole portion is included.

Further, the magnetic pole existing at the boundary position between the phases means one or the other magnetic pole facing the boundary position, or both magnetic poles.

In this way, since it is not necessary to newly provide the magnetic flux density adjusting portion at a position protruding to the outside of the coils at both ends, it is possible to avoid an increase in the number of parts and it is not necessary to widen the primary side member. Therefore, the magnetic flux density can be accurately adjusted while avoiding the increase in size and weight of the primary side member in the moving direction.

If the magnetic flux density adjusting portion is provided on the magnetic pole located at one end of the magnetic pole portion or the magnetic pole located at the interphase position, the adjustment standard of the magnetic flux density adjusting portion becomes clear, and the design for reducing cogging becomes easy. ..

According to the motor of the present invention, it is possible to provide a motor having a new configuration that solves the occurrence of cogging and the like without increasing the number of parts and increasing the weight of the primary side member.

The block diagram of the magnetic pole part of the motor which concerns on 1st Embodiment of this invention. Enlarged view of the main part of FIG. The figure which shows the state of the magnetic flux generated in the same embodiment. The graph which shows the cogging waveform by the same embodiment. The perspective view for demonstrating the basic structure of the motor. As a comparative example of the present invention, a configuration diagram of a motor in which the magnetic pole portion has a conventional structure. The figure which shows the state of the magnetic flux generated when the primary side is infinite length in the same comparative example. A graph showing a cogging waveform when the primary side has a finite length as in the comparative example. The graph which shows the cogging waveform by the same comparative example. The block diagram of the magnetic pole part of the motor which concerns on 2nd Embodiment of this invention. The block diagram of the magnetic pole part of the motor which concerns on 3rd Embodiment of this invention. The block diagram of the magnetic pole part of the motor which concerns on 4th Embodiment of this invention. The block diagram of the magnetic pole part of the motor which concerns on 5th Embodiment of this invention. The block diagram of the magnetic pole part of the motor which concerns on 6th Embodiment of this invention. The block diagram of the magnetic pole part of the motor which concerns on 7th Embodiment of this invention. The figure which shows the modification of this invention. The figure which shows the other application example of this invention. The block diagram of the magnetic pole part of the motor in the same application example. Another block diagram of the magnetic pole portion of the motor in the same application example. The block diagram of the magnetic pole part of the motor in the conventional example. The figure which shows the state of the magnetic flux generated at both ends of the magnetic pole of the central phase in the same conventional example. The figure which shows the state of the magnetic flux generated at the magnetic pole outer end of the end phase in the same conventional example.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In the drawings used for each of the embodiments described below, substantially the same components are designated by the same reference numerals, and duplicate description will be omitted as necessary.
<First Embodiment>

FIGS. 5 to 9 show a basic configuration that is a prerequisite for an HD (High Density) type linear motor, and a problem to be solved by this embodiment.

5 is a perspective view of a magnetic pole portion, FIG. 6 is a schematic cross-sectional view, and FIG. 7 is a schematic enlarged view of FIG. The line of sight in FIGS. 7 (b) to 7 (d) clearly shows the direction in which the magnetic flux flows, and the notation position is not always accurate. In these figures, the tooth portions 1a are formed evenly in the traveling direction of the secondary side member 1 made of magnetic material. On the other hand, the primary side member 3 is arranged at a position facing the secondary side member 1 with a gap 2 at a predetermined interval. The primary side member 3 is formed in an E shape by connecting the magnetic pole portions 3a, the magnetic pole portions 3b, and the magnetic pole portions 3c with a yoke 30, and the respective magnetic pole portions 3a, 3b, and 3c have predetermined intervals (equal intervals in this embodiment). A magnetic pole 31 is formed in the magnetic pole 31, and a permanent magnet 4 is inserted into the gap between the magnetic poles 31 and 31 so that the magnetic poles 31 and 31 are magnetized in the arrangement direction and the polarities of the adjacent magnetic poles 31 and 31 are opposite to each other. The same polarity appears on the side facing the secondary member 1. Further, a bridge 32 narrower than the magnetic pole 31 is formed at a position where the magnetic poles 31 and the yoke 30 of the magnetic pole portions 3a, 3b, 3c are connected, and between the bridges 32 and 32, between the magnetic poles 31 and the yoke 30. A separating gap (flux barrier) 6 is formed. A coil 5a is wound around the magnetic pole portion 3a configured in this way, a coil 5b is wound around the magnetic pole portion 3b, and a coil 5c is wound around the magnetic pole portion 3c, for example, three-phase alternating current. Thrust is generated by flowing the magnet, and the primary side member 3 moves relative to the secondary side member 1.

When the magnetic flux portions 3a, 3b, 3c of the primary side member 3 have such a configuration and a current is passed through the coils 5a, 5b, 5c in a certain direction, for example, the tooth portions 1a of the secondary side member 1 The magnetic flux that has flowed into the magnetic pole portion 3a at one end of the magnet wraps around the adjacent magnetic pole 31 through the permanent magnet 4 and exits to the yoke 30 via the bridge 32, and then from the other magnetic pole portions 3b and the magnetic pole portion 3c to the secondary side member. A main magnetic flux loop flowing out to 1 is formed (not shown).

At that time, the magnetic resistance inside each of the magnetic poles 3a, 3b, 3c is increased by providing a gap 6 in the upper part of the permanent magnet 4 inserted inside each of the magnetic poles 3a, 3b, 3c of the primary side member 3. Therefore, the value of the inductance of each coil 5a, 5b, 5c can be reduced.

By the way, when the primary side member 3 moves under no load, the magnetic poles 31 constituting the magnetic pole portions 3a, 3b, and 3c of the primary side member 3 move from the tooth portion 1a of the secondary side member 1 to the tooth portion 1a. During that time, thrust fluctuations of electric angle-period occur. When the magnetic flux densities of the magnetic poles 31 are substantially equal, the thrust fluctuations cancel each other out due to the mechanical displacement of the magnetic poles 31 if the primary side member has an infinite length. Therefore, the generated cogging torque can be kept within a relatively small range as shown in FIG.

However, when the primary side member has a finite length, focusing on the leakage of magnetic flux, as shown in FIG. 7C, the magnetic pole portions 3a-3b and 3b-3c are adjacent to each other, but the end phase Since there are no adjacent magnetic poles at the outer ends of the magnetic poles 3a (3c) (see FIGS. 7 (b) and 7 (d)), the magnetic flux H leaks between the phases in FIG. 7 (c), whereas in FIG. 7 (c), the magnetic flux H leaks. In b) and (d), the magnetic flux H corresponding to the leakage flux H flows toward the secondary side member 1 which is easy to flow. Therefore, the magnetic flux density B1 facing the secondary side at both ends of the magnetic pole portion 3b, which is the central phase, and the magnetic flux density B2 (B2) facing the secondary side at the outer ends of the magnetic pole portions 3a, 3c, which are the phases at both ends. > B1) causes a difference, which causes cogging, and large cogging as shown in FIG. 9 occurs.

Therefore, as shown in FIGS. 1 to 4, the magnetic flux density adjusting unit X1 of the present embodiment has the magnetic poles 31 located at the ends of the magnetic poles, that is, the magnetic poles 31 at the outer ends of the magnetic poles 3a and 3c located at both ends. The width W1 of the bridge 32 connecting the yokes 30 (see parts A and B) is wider than the width W0 of the other bridges 32 (see, for example, the bridges 32 located on both sides of the central magnetic flux portion 3b). ing. As a result, the magnetic resistance from the magnetic poles 31 at both ends to the yoke 30 decreases, and the short-circuit magnetic flux to the yoke 30 increases. As a result, the magnetic flux densities of the magnetic poles 31 at both ends decrease, the magnetic flux density facing the secondary side becomes approximately B1, and the secondary side of the magnetic poles 31 existing at the interphase position on the central side shown in FIG. 7 (c). It can be made to be substantially the same as the magnetic flux density B1 facing the surface.

FIG. 4 shows a state in which the cogging waveform resulting from this is superimposed on the cogging waveform of FIG. Although not as smooth as the infinite length shown in FIG. 8, the cogging waveform is greatly improved as compared with the conventional structure having a finite length shown in FIG.

As described above, according to the present embodiment, since it is not necessary to newly provide the magnetic flux density adjusting portion at the position where the coils 5a and 5c at both ends protrude to the outside, an increase in the number of component types can be avoided, and the yoke 30 also travels in the traveling direction. There is no need to increase the length. Therefore, the axial length of the linear motor can be shortened, which contributes to miniaturization, light weight, and cost reduction of the device to be used. Moreover, since it is only necessary to widen the bridge width W1 of the magnetic pole 31 at the end, the adjustment reference of the magnetic flux density adjusting unit X1 becomes clear, and the design and processing for reducing cogging become easy.
<Second Embodiment>

FIG. 10 is a block diagram of a magnetic pole portion of the motor according to the second embodiment of the present invention.

In the magnetic flux density adjusting unit X2 of the present embodiment, the width W2 of the magnetic poles 31 at the outer ends (see the parts C and D) of the magnetic poles 3a and 3c located at both ends is changed to the width W3 of the other magnetic poles 31 (for example, the center). It is thicker than the magnetic poles 31) located on both sides of the magnetic pole portion 3b. In this way, even if the magnetic flux flowing through the magnetic poles 31 at both ends is the same as the magnetic flux flowing through the magnetic poles 31 on the central side, the magnetic flux density decreases. As a result, the magnetic flux density facing the secondary side of the magnetic poles 31 at both ends becomes approximately B1 as in FIG. 3, and becomes the secondary side of the magnetic pole 31 existing at the interphase position on the central side shown in FIG. 7 (c). It can be made to be substantially the same as the facing magnetic flux density B7.

As described above, according to the present embodiment, since it is not necessary to newly provide the magnetic flux density adjusting portion at the position where the coils 5a and 5b at both ends protrude to the outside, an increase in the number of component types can be avoided and the yoke 30 can be widened. You don't even have to. Therefore, the magnetic flux density can be accurately adjusted while avoiding the increase in size and weight of the primary side member in the moving direction. Moreover, since it is only necessary to widen the magnetic pole width at the end portion, the adjustment standard of the magnetic flux density adjusting unit X2 becomes clear, and the design and processing for reducing cogging become easy.
<Third Embodiment>

FIG. 11 is a block diagram of a magnetic pole portion of the motor according to the third embodiment of the present invention.

The magnetic flux density adjusting unit X3 of the present embodiment has a thickness W4 (E portion) of a magnet 4 inserted in a gap between a magnetic pole 31 at the outer end and a magnetic pole 31 located inside the magnetic poles 3a and 3c located at both ends. And F part) is thinner than the other magnet 4 thickness W5 (see magnets 4 located on both ends of the central magnetic pole part 3b). In this way, the magnetic force of the magnet 4 is reduced, and the magnetic flux flowing through the magnetic poles 31 at both ends is reduced. As a result, the magnetic flux density facing the secondary side of the magnetic poles 31 at both ends becomes approximately B1 as in FIG. 3, and the magnetic flux facing the secondary side of the magnetic pole 31 existing at the interphase position on the central side shown in FIG. It can be made to be substantially the same as the density B1.

Even in this case, since it is not necessary to newly provide the magnetic flux density adjusting portion at the position protruding to the outside of the coils 5a and 5b at both ends, it is possible to avoid an increase in the number of component types and it is not necessary to widen the yoke 30. Therefore, the magnetic flux density can be accurately adjusted while avoiding the increase in size and weight of the primary side member in the moving direction. Moreover, since it is only necessary to reduce the thickness of the magnet 4 attached to the magnetic pole 31 at the end, the adjustment standard of the magnetic flux density adjusting unit X3 becomes clear, and the design and processing for reducing cogging become easy. Of course, instead of making the thickness of the magnet 4 relatively thin, the same effect can be obtained by making the magnet height relatively low.
<Fourth Embodiment>

FIG. 12 is a block diagram of a magnetic pole portion of the motor according to the fourth embodiment of the present invention.

In the magnetic flux density adjusting unit X4 of the present embodiment, the height H2 of the magnetic poles 31 at the outer ends of the magnetic poles 3a and 3c located at both ends (see G and H) is changed to the height H3 of the other magnetic poles 31 (for example, , Refer to the magnetic poles 31 located on both sides of the central magnetic pole portion 3b). In this way, the magnetic resistance from the magnetic poles 31 at both ends to the secondary side increases due to the increase in the gap with the opposite secondary side, and it becomes difficult for the magnetic flux to flow to the secondary side. As a result, the magnetic flux density facing the secondary side of the magnetic poles 31 at both ends becomes approximately B1 as in FIG. 3, and becomes the secondary side of the magnetic pole 31 existing at the interphase position on the central side shown in FIG. 7 (c). It can be made substantially the same as the facing magnetic flux density B1.

Even in this case, since it is not necessary to newly provide the magnetic flux density adjusting portion at the position protruding to the outside of the coils 5a and 5b at both ends, it is possible to avoid an increase in the number of component types and it is not necessary to widen the yoke 30. Therefore, the magnetic flux density can be accurately adjusted while avoiding the increase in size and weight of the primary side member in the moving direction. Moreover, since it is only necessary to lower the height H2 of the magnetic pole 31 at the end to increase the gap, the adjustment standard of the magnetic flux density adjusting unit X4 becomes clear, and the design and processing for reducing cogging become easy.
<Fifth Embodiment>

FIG. 13 is a block diagram of a magnetic pole portion of the motor according to the fifth embodiment of the present invention.

The magnetic flux density adjusting unit X5 of the present embodiment has a bridge height H4 (see parts I and J) that connects the magnetic poles 31 at the outer ends and the yoke 30 at the magnetic poles 3a and 3c located at both ends, and other bridges. The height is lower than the height H5 (see, for example, bridges 32 located on both sides of the central magnetic pole portion 3b) (that is, the flux barrier is lowered). As a result, the magnetic resistance of the magnetic poles 31 at both ends to the primary side is reduced. As a result, the magnetic flux H corresponding to the leakage flux easily flows to the yoke 30 on the primary side, and the short-circuit magnetic flux increases. As a result, the magnetic flux density facing the secondary side of the magnetic poles 31 at both ends becomes approximately B1, and the magnetic flux density B1 facing the secondary side of the magnetic pole 31 existing at the interphase position on the central side shown in FIG. 7C. Can be made to be substantially the same as.

Even in this case, since it is not necessary to newly provide the magnetic flux density adjusting portion at the position protruding to the outside of the coils 5a and 5b at both ends, it is not necessary to increase the number of parts and widen the yoke 30. Therefore, the magnetic flux density can be accurately adjusted while avoiding the increase in size and weight of the primary side member in the moving direction. Moreover, since it is only necessary to lower the bridge 32, the adjustment reference of the magnetic flux density adjusting unit X5 becomes clear, and the design and processing for reducing cogging become easy.
<Sixth Embodiment>

FIG. 14 is a configuration diagram of a magnetic pole portion of the motor according to the sixth embodiment of the present invention.

The magnetic flux density adjusting unit X6 of the present embodiment is a bridge of the magnetic pole 31 on the central side as compared with the width W6 of the bridge 32 connecting the magnetic poles 31 at the outer ends and the yoke 30 at the magnetic poles 3a and 3c located at both ends. The width W7 of 32 (for example, the bridge 32 connecting the magnetic poles 31 located on both sides of the central magnetic pole portion 3b and the yoke 30; see the K portion and the L portion) is narrowed. As a result, the magnetic resistance from the central magnetic pole 31 to the yoke 30 increases, and the magnetic flux H does not easily flow to the primary side and easily flows to the secondary side. As a result, the magnetic flux density facing the secondary side of the central magnetic pole 31 becomes approximately B2, and the magnetic flux density facing the secondary side of the magnetic poles 31 at both ends shown in FIGS. 7 (a) and 7 (c). It can be made to be substantially the same as B2.

Even in this case, since it is not necessary to newly provide the magnetic flux density adjusting portion at the position protruding to the outside of the coils 5a and 5b at both ends, it is possible to avoid an increase in the number of component types and it is not necessary to widen the yoke 30. Therefore, the magnetic flux density can be accurately adjusted while avoiding the increase in size and weight of the primary side member in the moving direction. Moreover, since it is only necessary to narrow the width of the bridge 32, the adjustment reference of the magnetic flux density adjusting unit X6 becomes clear, and the design and processing for reducing cogging become easy.
<7th Embodiment>

FIG. 15 is a block diagram of a magnetic pole portion of the motor according to the seventh embodiment of the present invention.

The magnetic flux density adjusting unit X7 of the present embodiment has a width W9 (M unit) of the magnetic poles 31 located at the boundary between the central phases, as compared with the width W8 of the magnetic poles 31 at the outer ends of the magnetic poles 3a and 3c located at both ends. And N part) is narrowed. As a result, the magnetic resistance between the magnetic poles adjacent to the central magnetic pole 31 increases, and the magnetic flux H to the secondary side increases as shown in FIG. As a result, the magnetic flux density facing the secondary side of the central magnetic pole 31 becomes approximately B2, and the magnetic flux density B2 facing the secondary side of the magnetic poles 31 at both ends shown in FIGS. 7 (a) and 7 (c). Can be made to be substantially the same as.

Even in this case, since it is not necessary to newly provide the magnetic flux density adjusting portion at the position protruding to the outside of the coils 5a and 5b at both ends, it is possible to avoid an increase in the number of component types and it is not necessary to widen the yoke 30. Therefore, the magnetic flux density can be accurately adjusted while avoiding the increase in size and weight of the primary side member in the moving direction. Moreover, since it is only necessary to narrow the width of the magnetic pole 31 existing at the interphase position, the adjustment reference of the magnetic flux density adjusting unit X7 becomes clear, and the design and processing for reducing cogging become easy.

Although some embodiments of the present invention have been described above, the specific configuration of each part is not limited to the above-described embodiments.

For example, in the motor of the above embodiment, the coil 4 is wound around each of the plurality of magnetic poles 31, but it can also be applied to a motor having a structure in which the coil 4 is wound around each magnetic pole 31.

Alternatively, in the above embodiment, the motor in which the primary side member 3 is provided on one side of the secondary side member 1 has been described, but as shown in FIG. 16, the primary side member 3 is sandwiched between the secondary side member 1 and both sides. The present invention can be applied to the motor provided with 3 in the same manner as in each of the above embodiments.

Further, in the above embodiment, the magnetic flux density adjusting portions are provided on the two magnetic poles at both ends or the two magnetic poles existing at the central interphase positions, but they exist only on one end side or the other end side, or at the two central interphase positions, respectively. It may be provided on only one or the other of the two magnetic poles. Alternatively, it is not necessary that all the permanent magnets or coils are arranged between the magnetic poles, and a non-magnetic material such as resin may be filled between some of the magnetic poles.

Further, in the above embodiment, the IPM type HD motor in which the magnet 4 is embedded in the magnetic pole 31 has been described, but as shown in FIG. 17, for the SPM type motor in which the magnet 4 is provided at the end of the magnetic pole 31. Can be applied in the same way. For example, FIG. 18 shows an example in which the thickness T1 of the magnet at the end is made thinner than the thickness T2 of the magnet on the center side to form a magnetic flux density adjusting portion, and FIG. 19 shows an example in which the width W8 of the magnetic pole 31 at the end is the central magnetic pole. The width is narrower than the width W9 of the magnetic flux density adjusting unit.

Further, the magnetic flux density adjusting unit can also be configured by making the reluctance of the magnetic material constituting the magnetic pole at the end relatively larger than the reluctance of the magnetic material constituting the magnetic pole existing at the boundary position between the phases. it can. That is, if the magnetic resistance is increased, it becomes difficult for the magnetic flux of the magnetic pole located at the end to pass through. As a result, the magnetic flux density of the magnetic flux flowing to the secondary side decreases, and there is no difference from the magnetic flux density of the magnetic flux flowing from the magnetic pole existing at the boundary position between the phases to the secondary side. Moreover, since it is only necessary to change the material of the magnetic pole, the adjustment becomes easy.

Further, in the magnetic flux density adjusting unit of the present invention, in order to substantially match the magnetic flux density of the magnetic poles at the ends and the magnetic flux density of the magnetic poles existing at the interphase position on the central side, one length, width, etc. and the other length, width, etc. Since a relative magnitude relationship is provided between the two, it is possible to appropriately select whether to change one or the other. Further, in the first embodiment, the other bridge widths are narrower than the bridge width at the outer end of the magnetic pole, but the bridge connecting the magnetic pole and the yoke may be eliminated. That is, there is a bridge at the outer end, and the inner side has a bridgeless structure.

Furthermore, the present invention may be on either the primary side or the secondary side on the fixed side or the movable side, and the operation type is not limited to the linear type, but can be applied to the rotary type as well.

Other configurations can be modified in various ways without departing from the spirit of the present invention.

1 ... Secondary side member 3 ... Primary side member 3a, 3b, 3c ... Magnetic pole part 4 ... Permanent magnet 5a, 5b, 5c ... Coil 31 ... Magnetic pole 32 ... Bridge X1, X2, X3, X4, X5, X6, X7 ... Magnetic flux density adjustment unit

Claims (3)

A secondary side member made of a magnetic material having teeth formed at predetermined intervals along the traveling direction and a primary side member arranged so as to be freely relative to the traveling direction of the secondary side member. It is a equipped motor
Each of the primary side members has a plurality of magnetic poles, and the plurality of magnetic pole portions arranged at intervals along the traveling direction and the magnetic pole portions provided along the arrangement direction of the magnetic pole portions are sequentially provided with opposite polarities. A plurality of permanent magnets arranged in such a manner and a coil wound around each of the plurality of magnetic pole portions to generate magnetic flux in a direction intersecting the arrangement direction are provided.
The coil is wound over one end and the other end of each of the plurality of magnetic pole portions, and two or more different phases are formed on the plurality of magnetic pole portions.
Each of the magnetic poles is connected to the yoke at an end opposite to the end facing the secondary member via a bridge narrower than the width along the traveling direction of the magnetic pole.
The size of the bridge connected to the outer end magnetic pole, which is the magnetic pole located at one end of the magnetic pole portion located at the end in the traveling direction, and the size of the bridge connected to the other magnetic poles are different from each other. By doing so, the magnetic flux density of the magnetic field flowing from the outer end magnetic pole to the secondary side member and the magnetic flux density of the magnetic field flowing into the secondary side member from the magnetic pole existing at the boundary position between the phases located inside the outer end magnetic pole are abbreviated. motor, characterized in that a magnetic flux density adjustment unit to match. A magnetic material secondary side member having teeth formed at predetermined intervals along the traveling direction and a primary side member arranged so as to be able to freely move relative to the traveling direction of the secondary side member. It is a equipped motor
Each of the primary side members has a plurality of magnetic poles, and the plurality of magnetic pole portions arranged at intervals along the traveling direction and the magnetic pole portions provided along the arrangement direction of the magnetic pole portions are sequentially provided with opposite polarities. A plurality of permanent magnets arranged in such a manner and a coil wound around each of the plurality of magnetic pole portions to generate magnetic flux in a direction intersecting the arrangement direction are provided.
The coil is wound around one end and the other end of each of the plurality of magnetic pole portions, and two or more different phases are formed on the plurality of magnetic pole portions.
By making the size of the outer end magnetic pole, which is the magnetic pole located at one end of the magnetic pole portion located at the end portion in the traveling direction, and the size of the other magnetic poles different from each other, two from the outer end magnetic pole. and the magnetic flux density of the magnetic flux flowing into the next side member, provided with the magnetic flux density adjuster to substantially match the magnetic pole existing in the boundary position between the magnetic flux density of the magnetic flux flowing into the secondary side member between said phase located inside than A motor characterized by that. A magnetic material secondary side member having teeth formed at predetermined intervals along the traveling direction and a primary side member arranged so as to be able to freely move relative to the traveling direction of the secondary side member. It is a equipped motor
Each of the primary side members has a plurality of magnetic poles, and the plurality of magnetic pole portions arranged at intervals along the traveling direction and the magnetic pole portions provided along the arrangement direction of the magnetic pole portions are sequentially provided with opposite polarities. A plurality of permanent magnets arranged in such a manner and a coil wound around each of the plurality of magnetic pole portions to generate magnetic flux in a direction intersecting the arrangement direction are provided.
The coil is wound around one end and the other end of each of the plurality of magnetic pole portions, and two or more different phases are formed on the plurality of magnetic pole portions.
The size of the permanent magnet provided between the outer end magnetic pole, which is the magnetic pole located at one end of the magnetic pole portion located at the end in the traveling direction, and the magnetic pole located inside the magnetic pole, and the size of the other permanent magnets. By making them different from each other, the magnetic flux density of the magnetic flux flowing from the outer end magnetic pole to the secondary side member and the magnetic flux existing at the boundary position between the phases located inside the outer end magnetic poles flow into the secondary side member. motor, characterized in that a magnetic flux density adjustment unit for substantially coincide with the magnetic flux density of the magnetic flux.

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