JP2006262611A - Motor for pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and inexpensive motor for a pump in which the motor body and a controller can be integrated without increasing the radial dimension, and thereby the work for attaching to a vehicle is facilitated. <P>SOLUTION: In a motor 1 where the rotor section 8 of the pump 3 is attached integrally to one end side of a shaft 6b, a controller 4 performing drive control of the motor body 2 can be fixed to the other end side of the shaft 6b, and the controller 4 can be connected electrically with the stator winding 7b of the motor body 2 by means of a bus bar (conductive member) provided in the axial direction of the motor body 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a motor for a pump suitable for a motor, particularly a pump mounted on a vehicle such as an automobile.

  In recent years, for example, in an automobile, it is considered that an electric pump constituting a hydraulic power source is mounted and energy is saved by appropriately operating the pump. Further, by using an electric pump, even when the engine is stopped due to idle stop or the like, it is possible to supply hydraulic pressure to a drive system such as a transmission to support the operation of the drive system. For such an on-vehicle electric pump, there is a demand for downsizing and cost reduction. For example, as described in Patent Document 1 below, the pump and the motor are integrated and made compact. It has been proposed to reduce the number of parts. That is, a conventional pump motor has a motor body including a rotor having a shaft, a stator core and a stator winding wound around the core, and the rotor portion of the pump is integrated with one end of the shaft. As a result, the compact design and the reduction in the number of parts are achieved.

JP 2002-31065 A (pages 3 to 4, FIG. 1)

By the way, in the conventional pump motor as described above, a controller for controlling the drive of the motor body is incorporated on the motor body side, and these controllers and the motor body are integrated to be assembled to an automobile or the like. It has been studied to construct a motor that can be easily performed and that has a reduced number of parts and a low cost, in which a wire harness connecting the motor body and the controller is omitted.
However, the conventional pump motor as described above generally uses a three-phase brushless motor, and needs to be electrically connected to the controller for each phase of the stator winding. For this reason, it is required to secure a connection space between each stator winding and the controller in the motor, and there is a problem that it is difficult to configure a compact motor. In particular, in the case of a pump motor for in-vehicle use as described above, the limitation on the radial dimension of the motor is very strict, and the above-mentioned connection space for three phases cannot be secured, and the motor body and the controller are integrated. It was difficult to make it.

  In view of the conventional problems as described above, the present invention can integrate the motor main body and the controller without increasing the radial dimension, and thus can be easily assembled to an automobile or the like. Another object is to provide a compact and inexpensive pump motor.

The present invention provides a motor body including a rotor having a shaft, a stator core and a stator winding wound around the rotor, and a pump rotor portion integrally assembled to one end portion of the shaft. A motor,
A mounting portion to which a controller for controlling the drive of the motor main body is attached is provided on the other end portion side of the shaft, and the controller and the stator winding are provided by a conductive member provided on an axial end surface of the motor main body. The wire is electrically connected.

  In the pump motor configured as described above, a controller for controlling the drive of the motor main body can be attached to the attachment portion provided on the other end portion of the shaft, and the controller is provided on the end surface in the axial direction. The conductive member is electrically connected to the stator winding. As a result, the controller can be electrically connected in the axial direction of the motor in series with the pump and the motor body, and can be electrically connected with the conductive member, without increasing the radial dimension of the motor. The controller can be integrated with the motor body.

The pump motor includes an insulator made of a synthetic resin provided with a bobbin portion disposed between the stator core and the stator winding on one end side in the axial direction of the motor body. It is preferable that the attachment portion is provided on the other end portion side in the axial direction of the motor body of the insulator.
In this case, when the bobbin portion of the insulator is disposed between the stator core and the stator winding, the controller can be attached to the attachment portion provided in the insulator, so that the increase in the number of parts of the motor is suppressed, Integration with the motor body of the controller can be easily performed.

In the pump motor, the motor body is a three-phase brushless motor, and the outer shape of the insulator on the other end side is formed into a quadrangle. The three conductive members to which the stator windings are connected may be arranged.
In this case, the outer shape of the insulator is configured as a quadrangle, and three conductive members to which the three-phase stator windings of the brushless motor are respectively connected are arranged at the three corners of the quadrangle. The stator winding and the conductive member can be electrically connected with a space secured.

In the pump motor, it is preferable that the conductive member is integrally formed with the mounting portion.
In this case, since the mounting member for mounting the conductive member on the motor body side is also used as the insulator, the number of parts of the motor is reduced and the motor is made compact compared to the case where the mounting member is provided separately. Can be configured. In addition, when the bobbin portion of the insulator is disposed between the stator core and the stator winding, it becomes possible to electrically connect the conductive member to the controller, and the connection work between the conductive member and the controller. It is possible to simplify the assembly work of the controller to the motor.

In the pump motor, the conductive member is preferably provided with a connection surface that is electrically connected to the controller when the insulator and the controller are coupled.
In this case, when the insulator and the controller are coupled, the connection surface of the conductive member is electrically connected to the controller, so that the electrical connection work between the conductive member and the controller can be omitted. The assembly work of the controller to the motor can be further simplified.

  According to the present invention, since the motor body and the controller can be integrated without increasing the radial dimension of the motor, the assembly work to an automobile or the like can be easily performed, and a compact and low cost pump A motor can be configured.

Hereinafter, preferred embodiments of the pump motor of the present invention will be described with reference to the drawings. In the following description, a case where the present invention is applied to an on-vehicle pump motor mounted on a vehicle such as an automobile will be described as an example.
FIG. 1 is a cross-sectional view of a pump motor according to an embodiment of the present invention. In FIG. 1, a pump motor 1 according to the present embodiment includes a motor body 2 constituted by a DC brushless sensorless motor having a three-phase star connection. The pump 3 and the controller 4 are assembled on the end side.
The motor body 2 is of an inner rotor type, and has a rotor 6 in a motor case 5 and a stator 7 provided outside the outer periphery of the rotor 6. The motor case 5 is formed in a rectangular tube shape so that an insulator 16 (described later) having a substantially rectangular outer shape can be accommodated. The motor case 5 includes a first cylindrical portion 5a that constitutes a motor chamber that accommodates the motor body 2, a second cylindrical portion 5b that constitutes a controller chamber that accommodates the controller 4, and first and second A partition portion 5c is provided between the second cylindrical portions 5a and 5b inside the case and partitions the motor chamber and the controller chamber.

The rotor 6 includes a rotor core 6a, a shaft 6b extending from the rotor core 6a in the axial direction of the motor body 2, and a rotor magnet 6c made of a permanent magnet that is externally fixed to the core 6a.
The stator 7 is provided with a stator core 7a and a stator winding 7b wound around the core 7a. More specifically, the stator core 7a includes a plurality of, for example, six teeth arranged at equal intervals around the axis of the motor body 2, and the bobbins 15a and 16a of the insulators 15 and 16 are provided in the respective teeth. A stator winding 7b of any one of U, V, and W phases is wound. That is, the motor body 2 is a three-phase motor having two teeth for each of the U, V, and W phases, and the two teeth for each phase are point-symmetric with respect to the axis of the motor body 2. Is provided.
The insulator 16 disposed on the other end side of the shaft 6b is provided with a mounting function for attaching the controller 4 to the motor 1 as will be described in detail later. A conductive member constituting a power supply line to the winding 7 b is integrated with the insulator 16.

The pump 3 is a trochoid pump which is a kind of internal gear pump, and includes a rotor portion 8 integrally assembled on one end side of the shaft 6b, a pump case 9 housing the rotor portion 8, and the pump And a pump plate 10 attached to the shaft end surface of the case 9.
The rotor portion 8 is provided with an inner gear 8a having teeth on the outer periphery and an outer gear 8b having teeth on the inner periphery that mesh with the teeth of the inner gear 8a. The inner gear 8a is attached to the shaft 6b so as to be integrally rotatable. On the other hand, the outer gear 8b is rotatably provided in the pump case 9, and when the inner gear 8a rotates according to the rotation of the shaft 6b, a pump action is generated between the inner gear 8a and the outer gear 8b. . Due to this pumping action, oil introduced between the gears 8a and 8b from the suction port (not shown) formed in the pump plate 10 passes through the discharge port (not shown) provided in the plate 10 and Supplied to each part of the vehicle. Thus, the motor main body 2 and the pump 3 are integrated by sharing the shaft 6b, thereby achieving compactness and a reduction in the number of members.

  The pump case 9 is attached to the motor case 5 by being press-fitted into the first cylindrical portion 5 a of the motor case 5. Further, a seal member 11 is installed between the pump case 9 and the pump plate 10 to prevent oil in the pump 3 from leaking outside. Further, a seal member 12 is provided between the pump case 9 and the shaft 6b to prevent oil in the pump 3 from leaking to the motor body 2 side. The pump case 9 is provided with a ball bearing 13 that supports one end of the shaft 6b. The ball bearing 14 is installed in the partition portion 5c of the motor case 5 and supports the other end of the shaft 6b. At the same time, the ball bearing 13 rotatably supports the shaft 6b.

The controller 4 controls the drive of the motor body 2 and is attached to the second cylindrical portion 5b and the partition portion 5c of the motor case 5 and the opening end of the second cylindrical portion 5b. A printed circuit board 18 is provided inside the controller chamber surrounded by a lid member 17 that covers the side. In the controller 4, the printed circuit board 18 is connected to the connector pin 23 inside the connector shell 22 attached to the side surface of the motor case 5, and the controller 4 is connected to a harness (not shown) connected to the connector pin 23. Thus, it can be connected to an electric device (not shown) on the vehicle side such as an ECU or a battery.
Further, on the printed circuit board 18, as illustrated in FIG. 1, the motor control unit 19 is configured by an IC, a microcomputer, and the like, and inputs a control command (current value command) from the ECU of the vehicle. And a motor driver (motor drive unit) 20 including a bridge circuit using a power switching element such as a MOSFET is mounted. Then, in the controller 4, the motor driver 20 performs the on / off operation of each switching element of the bridge circuit based on the current value command input by the motor control unit 19, so that the motor driver 20 performs the U phase and V phase of the motor body 2. A voltage from a battery (not shown) is applied to each of the W-phase stator windings 7b. As a result, in the motor body 2, a current flows through each stator winding 7 b, and the motor body 2 rotationally drives the pump 3.

The insulators 15 and 16 are made by molding with a synthetic resin having electrical insulating properties (for example, polyphenylene sulfide (PPS) or 66 nylon), and the bobbin portion on the different axial direction side of the motor body 2. 15a and 16a are formed.
More specifically, in the insulator 15, the bobbin portion 15 a extends from the ring-shaped base to the other end side in the axial direction of the motor body 2, and the bobbin portion 15 a is one end in the axial direction of the motor body 2. The stator core 7a is covered from the part side.
2 and 3, the bobbin portion 16a extends from the frame-shaped (frame-shaped) base portion 16b having a substantially rectangular outer shape toward one end portion in the axial direction of the motor body 2. It is being done. The bobbin portion 16a is placed on the stator core 7a from the other end side in the axial direction of the motor body 2 through a through hole (not shown) formed in the partition portion 5c of the motor case 5. The ends of the portions 15a and 16a are inserted into each other at the axial central portion of the stator core 7a, thereby constituting a winding frame of the stator winding 7b for each tooth. In addition, since the bobbin portions 15a and 16a form the winding frame as described above, the dielectric strength between the stator core 7a and the stator winding 7b is increased, and the stator configured by the heat-resistant insulation-coated conductive wire. The coating of the winding 7b can be reliably prevented from being damaged by the stator core 7a. The insulator 16 may be integrated with the stator core 7a and the stator winding 7b may be wound thereon.

The insulator 16 is formed with block-shaped attachment portions 16c extending from the base portion 16b so as to protrude toward the other end portion in the axial direction of the motor body 2 at substantially four corners of the base portion 16b. . In each attachment portion 16c, the end surface on the other axial end side is formed flat, and the printed circuit board 18 (FIG. 1) is detachably attached to the end surface by a bolt 21 (FIG. 1). .
Further, in the insulator 16, of the mounting portions 16c provided at the four corners, the bus bar 24 as the conductive member is integrally formed in the three corner mounting portions 16c by embedded molding. When the printed circuit board 18 is attached to the insulator 16, the motor driver 20 mounted on the circuit board 18 and the stator winding 7b are electrically connected for each phase by the bus bar 24 provided at the three corners. It has become so. That is, for example, U, V, and W phase stator windings 7b are connected to the upper right, lower right, and lower left bus bars 24 in FIG. 2, and the stator windings 7b for each phase correspond to the corresponding bus bars 24. Is electrically connected to the motor driver 20.

Specifically, referring to FIG. 4 as well, each bus bar 24 is provided on the same surface as the end surface of the mounting portion 16c, and is connected to the motor driver 20 (FIG. 1). A connection surface 24a connected to the connection surface 24a, and a substantially J-shaped connection piece 24b provided on the connection surface 24a and having an end 24b1 connected to the stator winding 7b of any phase. It has. Further, as shown in FIG. 3, each bus bar 24 is integrally formed with the insulator 16 in a state in which most portions except the connection surface 24 a and the end 24 b 1 are embedded in the attachment portion 16 c.
Further, the connection surface 24a is formed in a rectangular shape, and a hole portion through which the bolt 21 (FIG. 1) is inserted is provided in the central portion thereof. A nut 24c to which the bolt 21 is screwed is fixed in advance on the back side of the connection surface 24a and integrated with the bus bar 24. When the bolt 21 is connected to the nut 24c, the wiring portion 18a is connected to the nut 24c. The printed circuit board 18 (FIG. 1) is attached to the insulator 16 in contact with the connection surface 24a. Note that only the nut 25 is embedded in the upper left mounting portion 16 c in FIG. 2, and the printed circuit board 18 is fixed at the four corners of the insulator 16.

Further, in the connection piece 24b, the tip end portion of the corresponding stator winding 7b is fixed to the end portion 24b1. That is, the leading end portion of the stator winding 7b is pulled out into the control chamber through the through hole formed in the partition portion 5c and the radially inner opening of the frame-like base portion 16b. In a state where is peeled off, the tip end portion is wound around an end portion 24b1 formed to protrude from the surface of the one side on one side of the base portion 16b. And these front-end | tip parts and end part 24b1 are mutually fixed using welding, such as TIG welding, or ultrasonic bonding, etc., and the three-phase stator winding 7b is connected to the three bus bars 24, respectively. The motor driver 20 is connected.
In place of the above welding or joining, the tip may be formed in a U shape and connected by fusing.

  As described above, in the present embodiment, the attachment portion 16 c to which the printed circuit board 18 of the controller 4 can be attached is provided on the other end side in the axial direction of the insulator 16. Further, a bus bar (conductive member) 24 is integrally formed on the mounting portion 16c, and the printed circuit board 18 and the stator windings 7b of each phase are electrically connected by the bus bar 24. Thereby, without increasing the radial dimension of the pump motor 1, the pump 3, the motor body 2, and the controller 4 are arranged in series in the axial direction of the motor body 2 in this order, and the controller 4 is arranged in a three-phase manner. A pump motor 1 that can be integrated with the motor body 2 and can be easily assembled to an automobile or the like can be configured. Further, since the motor main body 2 and the controller 4 are electrically connected and integrated using the bus bar 24 integrally formed with the insulator 16, the constituent members for attaching the controller 4 to the motor main body 2 side. It is not necessary to separately provide the motor 1 for the pump, and furthermore, compared to the conventional example in which the motor body and the controller are connected by a wire harness, the wire harness can be omitted and the number of parts can be reduced. A compact and inexpensive pump motor can be configured.

  Further, in the present embodiment, the outer shape of the base portion 16b of the insulator 16 is configured to be substantially rectangular, and three bus bars 24 to which the three-phase stator windings 7b are respectively connected are arranged at three corners of the rectangle. Therefore, the stator winding 7b of each phase can be easily connected to the end portion 24b1 of the bus bar 24 with a sufficient connection space secured. In addition, since the bus bars 24 are distributed in the three corners, the size of the connection surface 24a, that is, the electrical contact area with the controller 4 (printed circuit board 18) can be sufficiently secured. In addition, by configuring the base portion 16b in a frame shape, the base portion 16b and thus the insulator 16 can be attached to the partition portion 5c of the motor case 5 without increasing the axial dimension of the motor body 2. The tip of the stator winding 7b of each phase can be pulled out to the inside of the control chamber at a free position of the opening portion on the radially inner side of the base 16b, and the connection work with the end 24b1 of the bus bar 24 can be performed. It can be simplified.

  In the above description, the case where the present invention is applied to a pump motor for in-vehicle use has been described. However, the present invention can be attached to a mounting portion provided on the other end side of the shaft by a motor driver that performs drive control of the motor body. Provided that a conductive member is provided on the axial end surface of the motor body, and the motor driver and the stator winding are electrically connected using this conductive member. The motor type such as the number and the number of poles and the use thereof are not limited to the above. The pump directly connected to the motor shaft is not limited to the trochoid pump. However, when using an internal gear pump such as the above-mentioned trochoid pump, involute, paracoid, hypocycloid, etc., a pump unit with a built-in motor is easier and lower noise than other pump types. It is preferable at the point which can be comprised.

  In the above description, the insulator is provided with the attachment portion to which the printed circuit board of the controller is attached, and the attachment portion and the bus bar are integrally configured. However, the present invention is not limited to this. Instead, for example, the configuration may be such that the stator winding and the controller are electrically connected by a conductive member provided on the base at a different position from the mounting portion. However, when the mounting portion and the bus bar are configured integrally as in the above-described embodiment, and the connection surface of the bus bar to the controller side is exposed on the same surface as the end surface of the mounting portion, the motor body It is preferable in that the insulator provided originally in the device can be used as a controller and a mounting member for the conductive member, and an increase in the number of parts of the motor can be suppressed. Further, when the insulator and the controller are coupled, the connection surface of the conductive member is electrically connected to the controller, so that the electrical connection work between the conductive member and the controller can be omitted. It is also preferable in that the assembly work of the controller to the motor can be further simplified.

  Further, in the above description, the case where an insulator having a base having a substantially rectangular outer shape and a rectangular cylindrical motor case for storing the insulator is used has been described. However, the shape of the insulator and the motor case is the same as that described above. It is not limited. For example, a cylindrical motor case having a circumscribed circular cross-sectional shape circumscribing the regular square can be used while forming the outer shape of the base of the insulator into a regular square.

It is sectional drawing of the motor for pumps which concerns on one embodiment of this invention. It is a top view of an insulator when it sees from the controller side shown in FIG. It is the III-III sectional view taken on the line of FIG. FIG. 3 is an enlarged perspective view of the bus bar shown in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor for pumps 2 Motor body 3 Pump 4 Controller 6 Rotor 6b Shaft 7a Stator core 7b Stator winding 8 (Pump) rotor part 16 Insulator 16a Bobbin part 16c Mounting part 24 Bus bar (conductive member)
24a Connection surface

Claims (5)

A pump motor comprising: a motor body including a rotor having a shaft; a stator core; and a stator winding wound around the rotor; and a rotor portion of the pump being integrally assembled to one end of the shaft. ,
On the other end side of the shaft, a mounting portion to which a controller for controlling driving of the motor body is attached is provided, and the controller and the stator winding are provided by a conductive member provided on an axial end surface of the motor body. Electrically connected to the wire,
A pump motor characterized by that. On the one end side in the axial direction of the motor body is provided with a synthetic resin insulator provided with a bobbin portion disposed between the stator core and the stator winding,
The pump motor according to claim 1, wherein the attachment portion is provided on the other end side in the axial direction of the motor body of the insulator. The motor body is a three-phase brushless motor, and the outer shape on the other end side of the insulator is formed into a quadrangle, and the three-phase stator windings are connected to three corners of the four corners, respectively. The pump motor according to claim 2, wherein the three conductive members are arranged.   The pump motor according to claim 2 or 3, wherein the conductive member is integrally formed with the mounting portion.   The pump according to any one of claims 2 to 4, wherein the conductive member is provided with a connection surface that is electrically connected to the controller when the insulator and the controller are coupled to each other. Motor.

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