Motor stator and motor including the same

Abstract

To provide a low-cost motor that ensures insulation between three-phase coils and stably outputs desired torque.SOLUTION: In a motor stator 10 where U-phase coils, V-phase coils, or W-phase coils are formed via insulating members 20 on each of multiple teeth 13 provided on a stator core 11, an insulating member 20 integrally includes an annular portion 22 positioned at one axial end of the stator core 11. The annular portion 22 is provided with a crossover wire holding portion 40 that axially holds with spacing a crossover wire portion Wa of a single continuous U-phase coil where four U-phase coils CU1 to CU4 are formed at intervals, a crossover wire portion Wb of a single continuous V-phase coil wire CLv where four V-phase coils CV1 to CV4 are formed at intervals, and a crossover wire portion Wc of a single continuous W-phase coil wire CLw where four W-phase coils CW1 to CW4 are formed at intervals.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a motor stator and a motor equipped with the same, and more particularly to a motor stator for a three-phase motor that can be suitably used as a drive source for electrical equipment mounted on a vehicle (automobile), such as an electric oil pump or an electric parking brake. [Background technology]

[0002] For example, Patent Document 1 listed below describes a motor stator in which a U-phase coil, a V-phase coil, or a W-phase coil is wound via an insulating member around each of a plurality of teeth spaced apart circumferentially on a cylindrical stator core. In the motor stator, at least a portion of the coil wires (crossover wires) that extend from each coil wound around the teeth to the outside of the stator core and electrically connect the coils of the same phase are held in a resin molded body separate from the insulating member in a state of not contacting the coils of other phases or the crossover wires of other phases. This resin molded body is an injection-molded product that is injection-molded with resin using the crossover wires as an insert part. It is claimed that this makes it possible to realize a motor stator at low cost in which insulation between the crossover wires (coils) of the U-phase, V-phase, and W-phase is ensured. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-19468 Summary of the Invention [Problem to be solved by the invention]

[0004] In the motor stator of Patent Document 1, when molding a resin molded body, each crossover wire needs to be held (temporarily held) in a state where it is not in contact with the coils of other phases and the crossover wires of other phases. This temporary holding is achieved, for example, by holding the crossover wire in a holding portion provided in a molding die for the resin molded body (see FIG. 1, etc.), or by holding the crossover wire with a movable arm disposed on the outer periphery of the stator core (see FIG. 4). However, each of the various temporary holding methods is considered to require a great deal of effort and / or cost (capital investment), which raises concerns about reduced production efficiency and increased costs for motor stators.

[0005] Therefore, an object of the present invention is to provide a highly reliable motor (three-phase motor) at low cost, in which insulation is ensured between the three-phase coils (crossover wires) provided in the motor stator, and which can stably output the desired torque. [Means for solving the problem]

[0006] The present invention, which has been devised to achieve the above object, A motor stator including a cylindrical stator core having a plurality of teeth spaced apart in the circumferential direction, and a plurality of U-phase coils, V-phase coils, and W-phase coils wound around each of the plurality of teeth with an insulating member interposed therebetween, the insulating member integrally includes an annular portion disposed on one axial end side of the stator core, This annular portion is characterized by having a jumper wire holding portion that holds, at intervals in the axial direction, a jumper wire portion of a single continuous U-phase coil wire in which multiple U-phase coils are formed with spaces between them, a jumper wire portion of a single continuous V-phase coil wire in which multiple V-phase coils are formed with spaces between them, and a jumper wire portion of a single continuous W-phase coil wire in which multiple W-phase coils are formed with spaces between them.

[0007] With a motor stator having the above configuration, coils can be formed in the following order, for example: multiple U-phase coils → multiple V-phase coils → multiple W-phase coils. If the jumper wire portions of the coil wires are held by the jumper wire holder when forming the coils of each phase, contact with the previously formed U-phase coil (coil wire of the U-phase coil) can be reliably avoided during the formation stage of the V-phase coil, and contact with the previously formed U-phase coil and V-phase coil (coil wires of the V-phase coil) can be reliably avoided during the formation stage of the W-phase coil. Furthermore, because the jumper wire holder is formed in an annular portion that is integral with the insulating member, the winding work (the work of forming each coil) can be performed at low cost without using a separate movable arm or the like to hold the jumper wire portions of the coil wires.

[0008] The crossover wire holding portion can include axial notches (axially extending notches) opening on the inner and outer circumferential surfaces of the annular portion of the insulating member, and a protrusion protruding radially outward from the annular portion. In this case, the axial notches can include a first notch through which the crossover wire portion of the U-phase coil wire passes, a second notch through which the crossover wire portion of the V-phase coil wire passes, and a third notch through which the crossover wire portion of the W-phase coil wire passes, and the axial lengths (axial terminal positions) of the three types of notches can be made different from one another, thereby easily preventing the crossover wire portions of different phases from contacting each other.

[0009] The winding direction of each crossover wire portion in the circumferential direction can be the same (for all of them). This makes it easier to arrange the crossover wire portions of each coil wire with a gap in the axial direction, which is advantageous in preventing contact between crossover wire portions of different phases.

[0010] The motor stator according to the present invention may further include a U-phase busbar, a V-phase busbar, a W-phase busbar, and a neutral busbar that are held in a non-contact state within the annular portion of the insulating member. In this case, a star-connected motor drive circuit can be formed by connecting one longitudinal end of the U-phase coil wire to a terminal of the U-phase busbar, connecting one longitudinal end of the V-phase coil wire to a terminal of the V-phase busbar, connecting one longitudinal end of the W-phase coil wire to a terminal of the W-phase busbar, and connecting the other longitudinal ends of the three coil wires to terminals of the neutral busbar.

[0011] One end and the other end of each coil wire in the longitudinal direction can be connected to the corresponding terminal by, for example, fusing, also known as heat crimping. Fusing allows the conductor wire, which is made of an insulating conductor, to be joined to the terminal at approximately the same time as the insulating coating is removed, making the connection work efficient and accurate.

[0012] The U-phase to W-phase busbars and the neutral busbar can be held in the insulating member by, for example, outsert-fitting (fitting) them into the insulating member. This allows one end and the other end of the coil wire to be connected to the terminals of the busbar, which are movable relative to the insulating member. Therefore, even if the longitudinal ends of the coil wire are misaligned, the connection to the corresponding busbar terminals can be performed with high precision. Note that in this case, connecting the ends of the coil wire to the busbar terminals restricts the relative movement of the busbar with respect to the insulating member (holding the busbar fixedly relative to the insulating member), preventing the busbar from separating from the insulating member when handling the motor stator, for example.

[0013] Since the motor stator according to the present invention has the above-mentioned features, a so-called inner rotor type motor (three-phase motor) equipped with the motor stator according to the present invention and a motor rotor inserted into the inner circumference of this motor stator has the features of being inexpensive to manufacture, yet being able to stably output a predetermined torque and being highly reliable. [Effects of the Invention]

[0014] As described above, according to the present invention, insulation between the three-phase coils (crossover wires) provided in the motor stator is ensured, and a highly reliable motor (three-phase motor) capable of stably outputting the desired torque can be provided at low cost. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic vertical cross-sectional view of a motor including a motor stator according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic perspective view of a motor stator. [Figure 3] FIG. 3 is a schematic perspective view of the motor stator 10 as seen from a different direction than that of FIG. 2. [Figure 4] FIG. 4 is a partially enlarged view of FIG. [Figure 5] FIG. 2 is a side view of the motor stator. [Figure 6] FIG. 6 is a partially enlarged view of FIG. 5. [Figure 7] 3 is a diagram for explaining the winding structure of the coil in the motor stator of FIG. 2.

[0023] FIG. [Figure 8] FIG. 8 is a diagram showing a star-connected motor drive circuit obtained by the winding structure of FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings (FIGS. 1 to 8). The terms "axial direction," "radial direction," and "circumferential direction" used in the following description refer to a direction parallel to the axis O of the motor 1 (motor stator 10) shown in FIG. 1, a radial direction of a circle centered on the axis O, and a circumferential direction of a circle centered on the axis O, respectively.

[0017] First, a brief description will be given of one example of the configuration of a motor (electric motor) 1 including a motor stator 10 according to an embodiment of the present invention, with reference to Fig. 1. This motor 1 is mounted on a vehicle such as an automobile, and constitutes an electric pump (electric oil pump) that generates oil pressure in the transmission while the engine is stopped, and is combined with a pump unit (not shown) that is driven by the output (rotation of the output shaft 3) of the motor 1. As the pump unit, for example, one in which a pump rotor is attached to a portion of the output shaft 3 of the motor 1 that protrudes axially outward from the casing 5 can be used.

[0018] The motor 1 is an inner rotor type having a motor rotor 2 (hereinafter simply referred to as "rotor 2"), a motor stator 10 arranged radially outside the rotor 2 at a distance, and a casing 5 that forms the housing of the motor 1.

[0019] The casing 5 includes a cylindrical motor housing portion 5A that houses the rotor 2 and the motor stator 10, and a motor cover 5B that fits into an end opening on one axial side of the motor housing portion 5A (the left side of the paper surface in FIG. 1; the same applies below) via an annular seal member to seal the opening. Both the motor housing portion 5A and the motor cover 5B are made of a metal material (e.g., aluminum alloy) that has good electrical and thermal conductivity and is easy to process.

[0020] The rotor 2 has an output shaft 3 of the motor 1, which is rotatably supported in a casing 5 via two bearings (a first rolling bearing 4A and a second rolling bearing 4B) spaced apart in the axial direction. One and other axial ends of the output shaft 3 protrude axially outward from the motor stator 10 (a stator core 11 constituting the motor stator 10), with the inner ring of the first rolling bearing 4A attached to the protruding portion on one axial side and the inner ring of the second rolling bearing 4B attached to the protruding portion on the other axial side. The outer rings of both rolling bearings 4A, 4B are attached to the motor cover 5B and the motor accommodating portion 5A of the casing 5, respectively. Deep groove ball bearings, for example, are used as the rolling bearings 4A, 4B.

[0021] The motor 1 is provided with a detection unit 6 for detecting the rotation angle of the rotor 2 (output shaft 3). The detection unit 6 includes a sensor magnet 7 attached to one axial end of the output shaft 3 via a bracket, and a rotation sensor (not shown) arranged axially opposite the sensor magnet 7. The rotation sensor is provided, for example, on a circuit board (not shown) arranged radially on one axial side of the motor 1. A control unit for controlling the operation of the motor 1 is provided on the circuit board. The rotation sensor is electrically connected to the control unit provided on the circuit board, and the detected value by the rotation sensor is input to the control unit. As a result, the detected value by the rotation sensor is used to control the operation of the motor 1. Note that the detection unit 6 is not necessarily provided and may be omitted in some cases. In other words, the motor 1 may be used in a sensorless state without the detection unit 6 (rotation sensor).

[0022] A motor stator 10 according to one embodiment of the present invention will be described in detail below with reference to Figs. 2 to 8. Fig. 2 is a schematic perspective view of motor stator 10, Fig. 3 is a schematic perspective view of motor stator 10 seen from a different direction than Fig. 2, Fig. 4 is a partial enlarged view of Fig. 3, Fig. 5 is a side view of motor stator 10, Fig. 6 is a partial enlarged view of Fig. 5, Fig. 7 is a diagram for explaining the winding structure of the coils in motor stator 10 of Fig. 2, and Fig. 8 is a diagram showing a star-connected motor drive circuit obtained by the winding structure of Fig. 8. In the following, motor stator 10 will also be simply referred to as "stator 10."

[0023] The stator 10 shown in FIG. 2 and other figures includes a stator core 11, an insulating member 20 made of an insulating material such as resin, and a plurality of coils C.

[0024] The stator core 11 has a cylindrical portion 12 and radial teeth 13 that protrude radially inward from the inner circumferential surface of the cylindrical portion 12 and are wound with coils C via insulating members 20. In this embodiment, a total of 12 teeth 13 are provided at equal circumferential intervals (at 30° intervals). Hereinafter, when the 12 teeth 13 are to be individually described, the 12 teeth 13 arranged in order along the circumferential direction will be referred to as first teeth 13A to twelfth teeth 13L, respectively (see FIG. 7). The stator core 11 is formed, for example, from a laminate in which multiple electromagnetic steel sheets are stacked in the axial direction, or from a powder magnetic core obtained by heating and sintering a compact of magnetic powder.

[0025] The insulating member 20 includes a tooth covering portion 21 that covers the teeth 13 of the stator core 11 and an annular portion 22 that is provided at one axial end of the stator core 11 and holds the U-phase bus bar 31, the V-phase bus bar 32, the W-phase bus bar 33, and the N-phase (neutral) bus bar 34 in a non-contact state. Although not shown in FIG. 1 , the insulating member 20 of this embodiment is formed by joining two halves that are separated within the axial range of the tooth covering portion 21, and the annular portion 22 that holds the bus bars 31-34 is formed integrally with one of the two portions (the portion that becomes the tooth covering portion 21). The bus bars 31-34 are outsert-fitted into the insulating member 20 and are held in the annular portion 22 of the insulating member 20. Each bus bar 31-34 is a conductive member that forms a motor drive circuit as shown in FIGS. 7 and 8 and supplies the drive current of the motor 1 output from an external power source (not shown) to the coil C. For this reason, bus bars 31 to 34 are made of a metal material having high conductivity, such as copper or an aluminum alloy.

[0026] The U-phase bus bar 31, V-phase bus bar 32, and W-phase bus bar 33 each have connection terminals 31a, 32a, and 33a to which one longitudinal end of the coil wire CL of the corresponding phase (U-phase coil wire CLu, V-phase coil wire CLv, and W-phase coil wire CLw, described below) is connected, and axially extending pin-shaped terminals 35. In the completed motor 1, each pin-shaped terminal 35 is inserted into a terminal insertion hole in a circuit board (not shown). This electrically connects the bus bars 31 to 33 to a control circuit provided on the circuit board.

[0027] The N-phase bus bar 34 has a connection terminal 36 to which the other longitudinal ends of the U-phase coil wire CLu, the V-phase coil wire CLv, and the W-phase coil wire CLw are connected, and this connection terminal 36 constitutes a neutral point when a star-connected motor drive circuit (see FIG. 8) is formed.

[0028] Coil C is wound in concentrated winding around each of the 12 teeth 13 via insulating member 20 (tooth covering portion 21) attached to stator core 10. Coil C includes four U-phase coils CU1 to CU4, four V-phase coils CV1 to CV4, and four W-phase coils CW1 to CW4, which are star-connected using bus bars 31 to 34 to form a motor drive circuit (power supply circuit) as shown in FIG.

[0029] Of the twelve coils C, four U-phase coils CU1-CU4 are formed by sequentially concentrating winding a single continuous U-phase coil wire CLu around each of a predetermined four teeth 13. In the present embodiment, as shown in Fig. 7 , the U-phase coils CU1-CU4 are wound in the order of the first tooth 13A, the fourth tooth 13D, the seventh tooth 13G, and the tenth tooth 13J. One longitudinal end and the other longitudinal end of the single continuous U-phase coil wire CLu, from which the four U-phase coils CU1-CU4 are formed at predetermined intervals, are connected to the connection terminal 31a of the U-phase bus bar 31 and the connection terminal 36 of the N-phase bus bar 34, respectively.

[0030] Furthermore, a total of four V-phase coils CV1 to CV4 are formed by sequentially concentrating winding one continuous V-phase coil wire CLv around each of a total of four predetermined teeth 13. In this embodiment, the V-phase coils CV1 to CV4 are wound in the order of the second tooth 13B, the fifth tooth 13E, the eighth tooth 13H, and the eleventh tooth 13K. One end and the other end in the longitudinal direction of the single continuous V-phase coil wire CLv, from which a total of four V-phase coils CV1 to CV4 are thus formed at predetermined intervals, are connected to the connection terminal 32a of the V-phase bus bar 32 and the connection terminal 36 of the N-phase bus bar 34, respectively.

[0031] Furthermore, a total of four W-phase coils CW1 to CW4 are formed by sequentially concentrating winding one continuous W-phase coil wire CLw around each of a total of four predetermined teeth 13. In this embodiment, the W-phase coils CW1 to CW4 are wound in the order of the third tooth 13C → the sixth tooth 13F → the ninth tooth 13I → the twelfth tooth 13L. One longitudinal end and the other longitudinal end of the single continuous W-phase coil wire CLw, from which a total of four W-phase coils CW1 to CW4 are formed at predetermined intervals, are connected to the connection terminal 33a of the W-phase bus bar 33 and the connection terminal 36 of the N-phase bus bar 34, respectively.

[0032] Although not shown, the ends of the coil wires CLu, CLv, and CLw are connected to the respective connecting terminals by, for example, so-called fusing (thermal crimping), in which a V-shaped terminal with the coil wires (ends) disposed inside is compressed (clamped) between a pair of electrodes and an electric current is passed between the pair of electrodes for a predetermined time. Fusing allows the insulating coating of each of the coil wires CLu, CLv, and CLw, which are conductors with an insulating coating, to be removed by heat at approximately the same time that the conductors are joined to the terminals, thereby enabling efficient connection work. The coil wires can also be connected to the respective connecting terminals by welding, such as TIG welding or laser welding.

[0033] The winding of the coil wire around the outer periphery of each tooth 13 starts from one axial end of stator core 10 (the side where annular portion 22 of insulating member 20 is provided) and ends at one axial end of stator core 10. That is, for example, when U-phase coil CU1 is wound around first tooth 13A, both the winding start and winding end of the U-phase coil wire CLu are pulled out to one axial end of stator core 10. The same is true when the remaining U-phase coils CU2 to CU4, V-phase coils CV1 to CV4, and W-phase coils CW1 to CW4 are wound around the corresponding teeth. This is to connect one and the other longitudinal ends of each coil wire to the connecting terminals of the bus bars 31 to 34 held in the annular portion 22, and also to hold the portion of each coil wire (crossover portions Wa, Wb, Wc) that is interposed between two adjacent coils in the longitudinal direction and connects the two coils in question in the crossover holding portion 40 described below.

[0034] 2 to 6, the annular portion 22 of the insulating member 20 constituting the stator 10 of this embodiment has a crossover wire holding portion 40 that holds the crossover wire portion Wa of the U-phase coil wire CLu, the crossover wire portion Wb of the V-phase coil wire CLv, and the crossover wire portion Wc of the W-phase coil wire CLw in a non-contact state. Here, the crossover wire holding portion 40 is provided so as to hold the crossover wire portions Wa, Wb, and Wc that extend circumferentially along the outer circumferential surface of the annular portion 22 at intervals from one axial side (the upper side of the paper in FIG. 2) to the other axial side (the lower side).

[0035] The crossover wire holding portion 40 includes axially extending slit-shaped notches (first notch 41a, second notch 42a, third notch 43a) that open on the inner and outer peripheral surfaces (and even on one end surface of the annular portion 22) of the insulating member 20, and protrusions (first protrusion 41b, second protrusion 42b, third protrusion 43b) that protrude radially outward from the outer peripheral surface of the annular portion 22.

[0036] The first notch 41a, the second notch 42a, and the third notch 43a are provided for passing (fitting) the crossover portion Wa of the U-phase coil wire CLu, the crossover portion Wb of the V-phase coil wire CLv, and the crossover portion We of the W-phase coil wire CLw, respectively, and have different axial lengths (axial terminal positions). Here, the first notch 41a has the shortest axial length, and the third notch 43a has the longest axial length. In other words, the axial terminal position of the first notch 41a is located on one axial side (upper side in FIG. 2 ) of the axial terminal positions of the second notch 42a and the third notch 43a, and the axial terminal position of the second notch 42a is located on one axial side of the axial terminal position of the third notch 43a.

[0037] The first notch 41a, the second notch 42a, and the third notch 43a are each provided in plurality at intervals in the circumferential direction. More specifically, the first notches 41a are provided on both circumferential sides of at least the first teeth 13A, fourth teeth 13D, seventh teeth 13G and tenth teeth 13J of the annular portion 22 of the insulating member 20, around which the U-phase coil wire CLu is wound; the second notches 42a are provided on both circumferential sides of at least the second teeth 13B, fifth teeth 13E, eighth teeth 13H and eleventh teeth 13K of the annular portion 22 of the insulating member 20, around which the V-phase coil wire CLv is wound; and the third notches 43a are provided on both circumferential sides of at least the third teeth 13C, sixth teeth 13F, ninth teeth 13I and twelfth teeth 13K of the annular portion 22 of the insulating member 20, around which the W-phase coil wire CLw is wound.

[0038] Furthermore, the plurality of protrusions 41b, 42b, 43b are also provided at intervals in the circumferential direction. More specifically, the plurality of first protrusions 41b are provided at intervals in the circumferential direction at positions shifted axially toward one side from the bottoms (ends on the other axial side) of the first notches 41a in order to restrict axial displacement of the crossover wire portion Wa of the U-phase coil wire CLu extending in the circumferential direction (to constrain the crossover wire portion Wa in the axial direction in cooperation with the first notches 41a) (see FIGS. 2 to 6).

[0039] The second protrusions 42b and the third protrusions 43b are similar to the first protrusions 41b. That is, the second protrusions 42b are provided at intervals in the circumferential direction at positions shifted to one axial side from the bottoms of the second notches 42a to cooperate with the second notches 42a to restrict axial displacement of the crossover wire portions Wb of the circumferentially extending V-phase coil wire CLv (to axially restrain the crossover wire portions Wb). The third protrusions 43b are provided at intervals in the circumferential direction at positions shifted to one axial side from the bottoms of the third notches 43a to cooperate with the third notches 43a to restrict axial displacement of the crossover wire portions We of the circumferentially extending W-phase coil wire CLw (to axially restrain the crossover wire portions Wec).

[0040] From the above, the jumper wire holding portion 40 provided in the annular portion 22 of the insulating member 20 holds the jumper wire portion Wa of a single continuous U-phase coil wire CLu formed with multiple (four in total) U-phase coils CU1 to CU4 spaced apart, the jumper wire portion Wb of a single continuous V-phase coil wire CLv formed with four V-phase coils CV1 to CV4 spaced apart, and the jumper wire portion Wc of a single continuous W-phase coil wire CLw formed with four W-phase coils CW1 to CW4 spaced apart, in a non-contact state with gaps in the axial direction.

[0041] In motor stator 10 of the present embodiment having such a configuration, coils CL can be formed in the following order: U-phase coils CU1-CU4 → V-phase coils CV1-CV4 → W-phase coils CW1-CW4. When forming each phase coil, if the crossover portions of the coil wires are held by crossover wire holders 40 provided in insulating member 20, contact with the previously formed U-phase coils CU1-CU4 (or the U-phase coil wire CLu on which the V-phase coils CV1-CV4 are formed) can be reliably avoided during the formation of the V-phase coils CV1-CV4. Furthermore, contact with the previously formed U-phase coils CU1-CU4 and V-phase coils CV1-CV4 (or the V-phase coil wire CLv on which the W-phase coils CW1-CW4 are formed) can be reliably avoided during the formation of the W-phase coils CW1-CW4. Furthermore, because crossover wire holders 40 are formed in annular portion 22 that is integral with resin insulating member 20, the winding process (the process of forming each coil) can be performed at low cost without using separate movable arms or the like to hold the crossover portions Wa, Wb, and Wc of the coil wires.

[0042] In addition, the crossover wire holding portion 40 includes axial notches opening to the inner and outer peripheral surfaces of the annular portion 22 and protrusions 41b, 42b, and 43b protruding radially outward from the annular portion 22. The axial notches further include a first notch 41a for passing the crossover wire portion Wa of the U-phase coil wire CLu, a second notch 42a for passing the crossover wire portion Wb of the V-phase coil wire CLv, and a third notch 43a for passing the crossover wire portion Wc of the W-phase coil wire CLw. Since the axial lengths (axial terminal positions) of the above three types of notches are different from one another, contact between the crossover wire portions Wa, Wb, and Wc can be easily avoided.

[0043] Furthermore, the winding direction in the circumferential direction of each of the crossover wire sections Wa, Wb, and Wc is (all) the same, which makes it easier to arrange the crossover wire sections Wa, Wb, and Wc at intervals in the axial direction, and is advantageous in preventing the crossover wire sections Wa, Wb, and Wc from contacting each other.

[0044] By combining the effects described above, the present invention ensures insulation between the three-phase coils (crossover sections) provided in the motor stator 10, making it possible to provide a highly reliable motor 1 at low cost that can stably output the desired torque.

[0045] Although the motor stator 10 according to the embodiment of the present invention has been described above, appropriate modifications can be made to the motor stator 10 without departing from the spirit and scope of the present invention. For example, in the embodiment described above, four coils C are formed on each of the coil wires CLu, CLv, and CLw of each phase, but the number of coils C formed on each of the coil wires CLu, CLv, and CLw can be selected arbitrarily.

[0046] The present invention is not limited to the above-described embodiments, and can be embodied in various other forms without departing from the spirit of the present invention. The scope of the present invention is defined by the claims, and includes the equivalents of the claims and all modifications within the scope of the claims. [Explanation of symbols]

[0047] 1 motor 2 Motor rotor 3 output shaft 5 Casing 10 Motor stator 11 Stator core 13 Teeth 20 Insulating material 22 Annular section 31 U-phase busbar 32 V-phase busbar 33 W-phase busbar 34 Neutral busbar C coil CLu U-phase coil wire CLv V-phase coil wire CLw W-phase coil wire CU1, CU2, CU3, CU4 U-phase coil CV1, CV2, CV3, CV4 V-phase coil CW1, CW2, CW3, CW4 W-phase coil Wa, Wb, Wc crossover section

Claims

1. A motor stator including a cylindrical stator core having a plurality of teeth spaced apart in the circumferential direction, and a plurality of U-phase coils, V-phase coils, and W-phase coils formed on each of the plurality of teeth via insulating members, the insulating member integrally includes an annular portion disposed on one axial end side of the stator core, a jumper wire holding portion that holds, at intervals in the axial direction, a jumper wire portion of a single continuous U-phase coil wire in which the plurality of U-phase coils are formed with spaces between them, a jumper wire portion of a single continuous V-phase coil wire in which the plurality of V-phase coils are formed with spaces between them, and a jumper wire portion of a single continuous W-phase coil wire in which the plurality of W-phase coils are formed with spaces between them, in the annular portion.

2. 2. The motor stator according to claim 1, wherein the crossover wire holding portion includes axial notches opening on inner and outer peripheral surfaces of the annular portion, and a protrusion protruding radially outward from the annular portion.

3. 2. The motor stator according to claim 1, wherein the winding directions of the crossover wires are the same in the circumferential direction.

4. The inverter further includes a U-phase bus bar, a V-phase bus bar, a W-phase bus bar, and a neutral bus bar that are held in the annular portion in a non-contact state with each other, 2. The motor stator according to claim 1, wherein one longitudinal end of the U-phase coil wire is connected to a terminal of the U-phase bus bar, one longitudinal end of the V-phase coil wire is connected to a terminal of the V-phase bus bar, one longitudinal end of the W-phase coil wire is connected to a terminal of the W-phase bus bar, and the other longitudinal ends of the U-phase coil wire, the V-phase coil wire, and the W-phase coil wire are each connected to a terminal of the neutral bus bar, thereby forming a star-connected motor drive circuit.

5. 5. The motor stator according to claim 4, wherein one end and the other end of each coil wire in the longitudinal direction are connected to corresponding terminals by fusing.

6. The motor stator according to claim 4 , wherein the U-phase bus bar, the V-phase bus bar, the W-phase bus bar, and the neutral bus bar are outsert-mounted to the annular portion.

7. A motor comprising: the motor stator according to any one of claims 1 to 6; and a motor rotor inserted into the inner periphery of the motor stator.

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