JP2015171211A - Electric fluid pump for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel electric fluid pump in which cooling performance of a motor by cooling water can be enhanced, without changing the basic configuration of the electric fluid pump.SOLUTION: Individual windings of respective phases (U phase, V phase, W phase) constituting a DC motor are divided into at least two windings and connected in parallel, and then the windings thus divided are wound around the salient poles of a stator. A partition wall member interposed between the stator and rotor, and cooling water is introduced to the rotor side, is brought into contact with the teeth of the salient pole. Since the winding diameter can be reduced by dividing the winding into two, and connecting them in parallel, the salient pole including the winding can be made thin and the width of the teeth can be increased. As a result, more heat can be released to the partition wall member. With such an arrangement, cooling performance by the cooling water can be enhanced, without changing the basic configuration of the electric fluid pump.

Description

  The present invention relates to an electric fluid pump, and more particularly to an electric fluid pump for an internal combustion engine mounted in an engine room of an automobile.

  In recent years, as the demand for reducing fuel consumption of automobiles has increased, commercialization of automobiles with an idling stop function and hybrid cars has progressed. Since these vehicles also stop the fluid pump driven by the internal combustion engine when the internal combustion engine stops, a fluid pump drive source other than the internal combustion engine is required. Moreover, in a hybrid vehicle or an electric vehicle, a driving motor, its control device, or a cooling water pump for cooling the battery is required. From these backgrounds, there is a tendency to increase the use of electric fluid pumps that perform a pump action by applying a rotational force to a rotor on which an impeller is fixed using an electric motor.

  The electric motor part used for such an electric fluid pump uses a DC electric motor part in which a rotor part provided with a permanent magnet is housed inside a stator part around which a three-phase winding is wound. The configuration is as shown in JP 2012-207591 A (Patent Document 1). And in the electric fluid pump of this patent document 1, the winding of each phase (U phase, V phase, W phase) which comprises a direct-current motor part is a plurality which protruded radially to the inner peripheral side of the stator part. It is wound around the salient pole part.

  In other words, each phase winding is divided into three parts, and the three divided windings are connected in series and divided into corresponding salient pole parts and wound to form a plurality of winding parts. In this configuration, a driving current is sequentially passed through the line portion to create a field.

  By the way, in such an electric fluid pump, it has been recently performed to integrally fix a drive control unit for flowing a controlled drive current to each winding unit to the electric fluid pump. As described above, the reason why the drive control unit is integrated with the electric fluid pump is that the wiring between each winding and the drive control unit is shortened to reduce the adverse effect of external noise as much as possible, and the wiring cost is reduced. It is performed for at least one purpose such as facilitating calibration between the pump and the pump unit and improving handling.

JP 2012-207591 A

  By the way, in such an electric fluid pump, it is important to improve the performance of the electric motor unit in order to increase the efficiency. Various factors can be considered as an impediment to improving the performance of the electric motor part, and one of them is a temperature rise due to heat generation of windings of each phase (U phase, V phase, W phase) constituting the DC electric motor part. It is the influence of the temperature represented by the temperature rise of the surrounding environment.

  The heat generation of the winding is largely due to the copper loss that occurs in the copper wire constituting the winding. In order to make up for the loss due to the copper loss, the amount of heat generated in the winding is further increased by supplying an excess current. In addition, since this type of electric fluid pump is mounted around the internal combustion engine, the ambient temperature becomes considerably high due to the operation of the internal combustion engine. For this reason, the heat generated in the internal combustion engine enters the electric fluid pump. In addition to this, the temperature of the electric fluid pump also rises due to iron loss generated in the iron core and friction loss due to friction of the bearings and the like.

  The winding resistance of the motor section increases due to the influence of these temperature rises, the magnetic force of the permanent magnet decreases, and the performance of the motor deteriorates. Further, the electronic components constituting the drive control section are affected by heat. Invoke the problem of deterioration.

  In order to solve the problem caused by such a temperature rise, it is most effective to cool the electric motor part. For example, the electric fluid pump circulates the cooling water sealed in the radiator of the internal combustion engine. If so, it is reasonable to use this cooling water to cool the motor section.

  However, forming a cooling part such as a new cooling water passage in the electric motor part causes new problems such as a complicated structure of the electric fluid pump and an increase in the overall physique. It is desired to improve the cooling performance of the electric motor unit by cooling water without changing the configuration of the pump.

  An object of the present invention is to provide a novel electric fluid pump capable of improving the cooling performance of the electric motor section by cooling water without changing the basic configuration of the electric fluid pump.

  A feature of the present invention is that the individual windings of each phase (U phase, V phase, W phase) constituting the DC motor unit are divided into at least two windings and connected in parallel. Winding the winding around the salient pole part of the stator part, and contacting the teeth part of the salient pole part with the partition member interposed between the stator part and the rotor part and introducing cooling water to the rotor part side, By the way.

  According to the present invention, the winding diameter can be reduced by dividing the winding into at least two parts and connected in parallel. Therefore, the slit interval can be reduced and the width of the tooth portion can be increased. As a result, much heat is applied to the partition wall member. You will be able to escape. As a result, the cooling performance of the electric motor unit by the cooling water can be improved without changing the basic configuration of the electric fluid pump.

1 is an overall perspective view of an electric fluid pump to which the present invention is applied. It is a perspective view of the electric fluid pump after removing the cover from the electric fluid pump shown in FIG. It is a perspective view of the electric motor part after taking out an electric motor part from the electric fluid pump shown in FIG. It is a perspective view of the electric motor part after removing the control board from the electric motor part shown in FIG. It is sectional drawing which shows the longitudinal cross-section of the electric fluid pump shown in FIG. It is a circuit diagram which shows the control circuit of a drive control part. FIG. 7 is a winding connection diagram schematically showing a connection state of windings of the electric motor unit shown in FIG. 6. It is a perspective view of the stator after removing the holder from the electric motor part shown in FIG. It is the top view which looked at the stator shown in FIG. 6 from the upper surface. FIG. 10 is a partially enlarged top view in which a part of the stator shown in FIG. 9 is enlarged and viewed from above.

  Embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and application examples are included in the technical concept of the present invention. It is included in the range.

  Embodiments of an electric fluid pump according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of the electric fluid pump. The electric fluid pump shown in FIG. 1 is a cooling pump that uses cooling water as a working fluid and is incorporated in a circulation circuit connected to a radiator that is a heat exchanger. For example, in a hybrid vehicle, an internal combustion engine, a drive motor, It is a water pump that supplies cooling water to an inverter or the like.

  The electric fluid pump 10 includes a main body 10A made of an aluminum alloy or the like, and a metal cover 10B such as an aluminum alloy that covers a drive control unit fixed adjacent to the main body 10A. The electric fluid pump 10 is fixed to a pump housing (not shown), and performs a pump action by rotating an impeller attached to the tip of a rotating shaft. The connector 12 is taken out from the main body 10A, and power is supplied from a battery (not shown). Since the cover 10B is made of metal, it has a heat sink function that dissipates heat generated by the drive control unit to the outside.

FIG. 2 shows a perspective view of the electric fluid pump 10 after the cover 10B is removed. An electric motor part (not shown) is accommodated in the main body 10A, and a holder 14 made of a circular synthetic resin is attached so as to cover the electric motor part. A box-shaped storage portion 16 connected to a part of the outer periphery of the holder 14 is provided in the main body 10 </ b> A, and electrical components described later and the connector 12 described above are arranged in the storage portion 16. A control board 18 is arranged and fixed on the upper side of the holder 14, and a drive control circuit is attached between the holder 14 and the control board 18. This drive control circuit includes a circuit necessary for inverter control of the motor unit. FIG. 3 is a perspective view of the motor unit 10C after the motor 10C is taken out from the main body 10A. The electric motor unit 10C includes a stator unit 20, a rotor unit (not shown) housed inside, and a rotating shaft 22 fixed to the rotor unit. A holder 14 is fixed to the stator portion 20 with bolts 24.

  FIG. 4 shows a perspective view of the electric motor unit 10C after the control board 18 is removed from the electric motor unit 10C. The holder 14 is provided with terminals for electrical connection with the windings of the control board 18 and the stator part 20. The terminals 26 for connection with the control board 18 and the windings of the stator part 20 are electrically connected. And a terminal 28 for making a simple connection. Each terminal 26 and 28 is connected to the input part and neutral point part of each phase.

A part of the holder 14 is formed with a notch opening 30 in which a part of an electrical component such as an inductance element or a capacitor is accommodated. The notch opening 30 is formed so as to face the box-shaped storage portion 16 shown in FIG. 2. A more detailed internal structure of the above-described electric fluid pump will be described with reference to FIG. . As shown in FIG. 5, the electric motor unit 10 </ b> C includes at least the rotor unit 32 and the stator unit 20. The electric motor part 10C is accommodated in an electric motor part accommodating part 34 provided on one side of a metal main body 10A made of, for example, an aluminum alloy. Since the rotor portion 32 is disposed on the inner peripheral side of the stator portion 20 and includes a permanent magnet, a rotational force is applied by a field generated by the winding portion 40 of the stator portion 20.

  Further, the side of the main body 10 </ b> A opposite to the electric motor unit storage portion 34 is fixed to a pump housing (not shown). An impeller 36 that performs pumping action is disposed in this portion, and is rotated by the rotating shaft 22. The rotating shaft 22 is fixed to the rotor portion 32 constituting the electric motor portion 10C, and the rotating shaft 32 is rotated by the rotation of the rotor portion 32.

  The space between the motor unit storage portion 34 and the impeller 36 is sealed in a liquid-tight manner, and liquid does not enter this portion. Specifically, the rotor portion 32 and the stator portion 20 are separated in a liquid-tight manner by a partition wall member 42 formed in a cup-like hollow circular shape. The partition member 42 extends along the axial direction of the stator portion 20, and is fixed to the stator portion 20 at both ends of the partition member 42. The fixing portions at both ends are configured to liquid-tightly isolate the interior of the partition member 42 and the stator portion 20. For example, the stator portion 20 and both ends of the partition wall member 42 are sealed through O-rings.

  The partition member 42 is made of nonmagnetic austenitic stainless steel, and its thickness is set to about 0.3 mm to 0.7 mm. The thickness of the partition member 42 is preferably as thin as possible. If the partition member 42 is thinned while maintaining a predetermined strength, the air gap can be further reduced and the efficiency of the electric motor can be improved. Further, the partition member 42 preferably has a high heat transfer performance because the heat of the electric motor unit 10C is released to the cooling water.

  The rotor part 32 is accommodated in the partition member 42, and the rotor part 32 rotates inside the partition member 42. Since the rotor portion 32 includes a permanent magnet or the like, the rotor portion 32 is molded from the outside with a synthetic resin. Since cooling water is introduced into the partition member 42, the rotor 32 is prevented from being corroded by a synthetic resin.

  The interior of the partition member 42 is communicated with a portion where the impeller 36 is disposed by a passage (not shown) so that the cooling water of the internal combustion engine is introduced into the partition member 42. Therefore, the cooling water takes the heat of the electric motor part 10C through the partition wall member 42, thereby cooling the electric motor part 10C.

  The outer periphery of the partition member 42 is in contact with the tooth portion of the salient pole portion formed on the stator portion 20, so that heat is efficiently transferred from the tooth portion. Therefore, the larger the contact area between the partition wall member 42 and the tooth portion, the higher the heat transfer efficiency. The present embodiment is greatly characterized in that the contact area between the partition wall member 42 and the tooth portion is increased, which will be described in detail with reference to FIGS.

  Returning to the figure, in the electric motor unit storage unit 34, the winding wound around the iron core 38 constituting the stator unit 20 and the salient pole portion (not shown) projecting inwardly toward the iron core as described above. The line part 40 is accommodated.

  The stator portion 20 is fixedly covered by the holder 14, and the control board 18 is fixed in a state in which both are fixed. As described above, a circuit necessary for inverter control is mounted on the control board 18 and is connected to the winding 40 via each terminal. Electrical components such as an inductor 44 and a capacitor 46 are mounted on the end side of the control board 18, and a part of these large electrical components is accommodated in the accommodating portion 16. Furthermore, in this state, the cover 10B is covered with the main body 10A and sealed, and the electric fluid pump 10 is completed.

  Next, the configuration of the drive control unit mounted on the control board 18 will be briefly described with reference to FIG. In the following description, an insulated gate bipolar transistor is used as a power semiconductor element and is abbreviated as IGBT.

  In FIG. 6, an IGBT 52 and a diode 56 that operate as an upper arm, and an IGBT 62 and a diode 66 that operate as a lower arm constitute a series circuit 50 of upper and lower arms. The inverter circuit IV is provided corresponding to the three phases of the U-phase, V-phase, and W-phase of the AC power to be output from the series circuit 50.

  These three phases correspond to the three-phase windings of the stator portion 20 of the electric motor portion 10C. The series circuit 50 of the three-phase upper and lower arms outputs an alternating current from the intermediate electrode 69 of the series circuit. The intermediate electrode 69 is connected to an AC bus bar 86 via an AC terminal 59 and further electrically connected to each phase winding 40 of the stator portion 20 via an AC connector 88.

  The collector electrode of the IGBT 52 of the upper arm is electrically connected to the positive electrode conductor plate 92 via the positive electrode terminal 57, and the emitter electrode of the IGBT 62 of the lower arm is electrically connected to the negative electrode conductor plate 94 via the negative electrode terminal 58. The positive electrode conductor plate 92 and the negative electrode conductor plate 94 are electrically connected to the capacitor 90, and are further electrically connected to the battery 30 via the DC connector 33.

  The control circuit 72 is a control signal for controlling the upper arm IGBT 52 and the lower arm IGBT 62 constituting the serial circuit 50 of each phase constituting the inverter circuit IV based on the control command from the upper control device. A control pulse is generated and supplied to the driver circuit 74.

  Based on the control pulse, the driver circuit 74 sends a drive pulse for controlling the IGBT of each phase via the signal emitter electrode 55 of the IGBT 52, the gate electrode 54, the signal emitter electrode 65 of the IGBT 62, and the gate electrode 64. Supply. The IGBT of each phase performs conduction or cutoff operation based on the drive pulse from the driver circuit 74, converts the DC power supplied from the battery 31 into three-phase AC power, and supplies it to the stator unit 20.

  The control circuit 72 includes a microcomputer (hereinafter referred to as “microcomputer”) for performing arithmetic processing on the switching timing of the IGBT 52 and the IGBT 62. The input information to the microcomputer includes the rotation speed or torque required for the motor unit 10C, the current value supplied from the series circuit 50 to the motor unit 10C, the magnetic pole position of the rotor of the motor unit 10C, and the like. is there.

  The target rotational speed or torque is based on a command signal output from a host control device (not shown). The current value is detected based on the voltage of the shunt resistor. The magnetic pole position is detected by the motor unit 10C based on the phase voltage.

  The microcomputer in the control circuit 72 calculates the d-axis and q-axis current command values of the motor unit 10C based on the target rotational speed or torque, and detects the calculated d-axis and q-axis current command values. The d-axis and q-axis voltage command values are calculated based on the difference between the d-axis and q-axis current values, and the calculated d-axis and q-axis voltage command values are calculated based on the detected magnetic pole positions. And converted into voltage command values for the U phase, V phase, and W phase. Then, the microcomputer generates a pulse-like modulated wave based on a comparison between the fundamental wave (sine wave) and the carrier wave (triangular wave) based on the voltage command values of the U phase, V phase, and W phase, and the generated modulation wave The wave is output to the driver circuit 74 as a PWM (pulse width modulation) signal.

  When driving the lower arm, the driver circuit 74 outputs a drive signal obtained by amplifying the PWM signal to the gate electrode of the corresponding IGBT 62 of the lower arm. Further, when driving the upper arm, the driver circuit 74 amplifies the PWM signal after shifting the level of the reference potential of the PWM signal to the level of the reference potential of the upper arm, and uses this as a drive signal as a corresponding upper arm. Are output to the gate electrodes of the IGBTs 52 respectively.

  The above is the specific configuration of the inverter circuit. Since this configuration is well known, further description is omitted.

  In the present embodiment, the U-phase and V-phase are used for the purpose of increasing the width of the tooth portion by shortening the gap between the salient pole portions including the windings and releasing a large amount of heat to the partition member 42. The W-phase individual windings are divided into at least two or more windings between the input phase portion and the neutral point portion and connected in parallel, and the divided windings are connected to the salient poles of the stator portion. The partition wall member 42 and the tooth portion of the salient pole portion are in thermal contact with each other. In the present embodiment, the winding of each phase is shown as being divided into three. However, basically, any winding may be used as long as it is divided into two or more.

  In FIG. 7, the U-phase winding 40 is divided into three parts, which are constituted by unit windings 40-U1, 40-U2, and 40-U3. The unit windings 40-U1, 40-U2, and 40-U3 are connected in parallel between the U-phase input section 41 and the neutral point section 43, respectively.

  Further, the V-phase winding 40 is also divided into three parts, which are composed of unit windings 40-V1, 40-V2, and 40-V3, and each unit winding 40-V1, 40-V2, and 40-V3 are V-phase windings. The input unit 41 and the neutral point unit 43 are connected in parallel.

  Similarly, the W-phase winding 40 is also divided into three parts, each comprising unit windings 40-W1, 40-W2, and 40-W3. Each unit winding 40-W1, 40-W2, and 40-W3 is composed of the W-phase. The input unit 41 and the neutral point unit 43 are connected in parallel.

  The winding 40 of each phase is wound around nine salient pole portions formed on the iron core forming the stator portion 20 in the order of each phase. In addition, in what is divided into 2 as mentioned above, the winding 40 of each phase is wound around the six salient pole parts formed in the iron core which forms the stator part 20 according to the order of each phase. .

  Here, in the present embodiment, the three-phase winding is shown as being connected by star (Y) connection, but other than this, delta (Δ) connection may be used. The V-phase and W-phase windings are divided into two or more parts and connected in parallel.

  Next, the detailed structure of the stator part 20 of a present Example is demonstrated based on FIG. 8, FIG. In FIG. 8, the iron core 38 constituting the stator portion 20 is composed of laminated silicon steel plates or the like, and has nine salient pole portions 20A extending radially toward the inner peripheral side. The iron core 38 is an integral core, and the salient pole portion 20A is also formed at the same time. A bobbin portion made of an insulating synthetic resin is provided around the salient pole portion 20A. The bobbin portion has a function for ensuring insulation between the winding 40 wound around itself and the salient pole portion 20A. A winding 40 of each phase is wound around this bobbin portion to form a winding portion.

  The nine salient pole portions 20A are arranged at equal intervals so as to be adjacent to each other, and an insulating portion 20B is provided on the bobbin portion around which the winding 40 is wound and the inner peripheral portion of the iron core 38. The bobbin portion and the insulating portion 20B are integrally formed by injecting an insulating synthetic resin.

  The bobbin portion covering the salient pole portion 20A is formed by winding the windings 40 of each phase, and is normally arranged in the order of the U phase, the V phase, and the W phase. In the present embodiment, the windings of each phase are divided into three pieces and wound in parallel, so that nine salient pole portions 20A are formed in the iron core 38.

  In FIG. 9, a U-phase salient pole part 20A-U1, a V-phase salient pole part 20A-V1, and a W-phase salient pole part 20A-W1 form a first set, and the U-phase salient pole part 20A-U2 , The V-phase salient pole part 20A-V2, the W-phase salient pole part 20A-W2, and the U-phase salient pole part 20A-U3, the V-phase salient pole part 20A-V3, the W-phase. The salient pole portions 20A-W3 are a third set, and are arranged in order according to the set order.

  And the winding start end part of the winding of U phase salient pole part 20A-U1-20A-U3, the winding start end part of the winding of V phase salient pole part 20A-V1-20A-V3, and W phase The winding start ends of the salient pole portions 20A-W1 to 20A-W3 are connected to the respective input phase portions 41. Further, the winding end ends of the windings of the U-phase salient pole portions 20A-U1 to 20A-U3, the winding end ends of the windings of the V-phase salient pole portions 20A-V1 to 20A-V3, and the W-phase windings. The winding end ends of the windings of the salient pole portions 20A-W1 to 20A-W3 are connected to the neutral point portion 43, respectively. As a result, the winding 40 divided into three for each phase is connected in parallel between the input phase portion 41 and the neutral point portion 43 of each phase.

  A partition wall member 42 is provided inside each of the salient pole portions 20A-U1 to 20A-W3, and the rotor portion 32 is accommodated in the partition wall member 42. Further, as described above, the partition member 42 is provided inside the partition wall member 42. Is the one where cooling water is introduced.

  And as shown in FIG. 10, each salient pole part 20A-U1-20A-W3 has the teeth part 45 formed in the front end side. Each of the salient pole portions 20A-U1 to 20A-W3 includes a synthetic resin bobbin portion 20C around which the winding 40 is wound, and the teeth portion 45 is exposed so as to protrude from the bobbin portion 20C. . Therefore, a heat transfer path is formed by the iron core 38 constituting the stator portion 20, the salient pole portion 20 </ b> A formed integrally with the iron core 38, and the tooth portion 45.

  The tip of the tooth portion 45 of each salient pole portion 20 </ b> A extends inward and has a shape having an arc that overlaps the same circumference. The arc of the tip of the tooth portion 45 and the outer peripheral surface of the partition wall member 42 Are in a matching shape.

The arcs of the tooth portions 45 of the salient pole portions 20A-U1 to 20A-W3 and the circular outer peripheral surface of the partition wall member 42 are basically thermally connected in a form in which the metals are in contact with each other. Heat can be efficiently transferred from the tooth portion 45 to the partition member 42. Further, if necessary, a heat dissipating adhesive having a high heat transfer coefficient is used for contact between the teeth 45 of each of the salient poles 20A-U1 to 20A-W3 and the outer peripheral surface of the partition wall member 42 to further thermally connect them. You can also In this way, the heat transfer performance can be further improved. As the heat radiation adhesive, a thermosetting resin containing a filler such as aluminum oxide (Al ₂ O ₃ ) or a moisture curable resin can be used.

  As described above, the outer periphery of the partition wall member 42 is in contact with the tooth portion 45 of the salient pole portion 20 </ b> A formed in the stator portion 20, and heat is efficiently transferred from the tooth portion 45. Therefore, the larger the contact area between the partition wall member 42 and the tooth portion 45, the higher the heat transfer efficiency. The present embodiment is greatly characterized in that the contact area between the partition wall member 42 and the tooth portion 45 is increased.

  As described above, each phase winding is divided into three and connected in series in the conventional one, but in this embodiment, each phase winding is divided into three and connected in parallel. Yes. If the conditions for the power input to each input phase are the same, the diameter of the winding 40 is 1 / √3 times greater when connected in parallel than when connected in series. In addition, the number of turns is tripled.

  For this reason, since the diameter of the winding 40 can be shortened (= thinned), the gap (slit interval) between the salient pole portions 20A can be reduced. Therefore, since the circumferential width of the arc surface of the tooth portion 45 can be increased, the surface area on the inner peripheral side of the stator 20 is increased, and the cooling effect of the winding 40 is improved. In addition, since the circumferential width of the tooth portion 45 can be increased, the contact area with the partition wall member 42 increases, so that a large amount of heat is generated via the salient pole portion 20A and the tooth portion 45 via the bobbin portion 20C. It can be transmitted to the partition member 42.

  Further, since the number of turns of the winding 40 is increased, the entire surface area can be increased by about 1.7 times, and the heat radiation from the winding 40 can be increased. Accordingly, heat can be transmitted to the partition member 42 through the air around the winding 40, the salient pole portion 20 </ b> A via the bobbin portion 20 </ b> C, and the tooth portion 45.

  As described above, in this embodiment, the windings of the respective phases are divided into three parts and connected in parallel, so that the circumferential width of the teeth portion 45 can be increased, and By increasing the contact area, a large amount of heat accumulated in the electric motor unit 10C can be transmitted to the partition member 42 via the salient pole portion 20A and the tooth portion 45, and further to the cooling water. . In this case, in addition to the heat generated in the winding 40, heat generated by the operation of the internal combustion engine that is input from the surrounding environment can be transmitted to the partition member 42 via the salient pole portion 20A and the teeth portion 45. Become.

  As described above, in the electric fluid pump, it is important to improve the performance of the electric motor unit in order to increase the efficiency. As an impediment to improving the performance of the motor part, the temperature rise caused by the heat generation of the windings of each phase (U phase, V phase, W phase) constituting the motor part and the influence of the temperature represented by the temperature rise of the surrounding environment It is. The winding resistance of the motor section increases due to the influence of these temperature rises, the magnetic force of the permanent magnet decreases, and the performance of the motor deteriorates. Further, the electronic components constituting the drive control section are affected by heat. Invoke the problem of deterioration.

  In order to solve such a problem, in the present invention, individual windings of each phase (U phase, V phase, W phase) constituting the motor unit are divided into at least two windings and connected in parallel. Then, it is proposed that the divided windings are wound around the salient pole part of the stator part, and that the partition wall member interposed between the stator part and the rotor part is brought into contact with the teeth part of the salient pole part. Yes.

  In the embodiment, the winding of each phase is shown as being divided into three parts, but basically, it is only necessary to divide into two or more parts and connect them in parallel. Furthermore, although the winding of each phase is shown as a star connection, a delta connection is also applicable.

  According to the present invention, since the winding diameter can be reduced by dividing the winding into at least two parts, the gap between the salient pole portions including the winding can be reduced, so that the width of the tooth portion can be increased. A lot of heat can be released to the member. As a result, the cooling performance of the electric motor unit by the cooling water can be improved without changing the basic configuration of the electric fluid pump.

  DESCRIPTION OF SYMBOLS 10 ... Electric fluid pump, 10A ... Main body, 10B ... Metal cover, 10C ... Electric motor part, 14 ... Holder, 16 ... Storage part, 18 ... Control board, 20 ... Stator part, 20A-U1-20A-U3, 20A -V1-20A-V3, 20A-W1-20A-W3 ... salient pole part, 20C ... bobbin part, 32 ... rotor part, 34 ... motor part storage part, 36 ... impeller, 38 ... iron core, 40-U1-40- U3, 40-V1 to 40-V3, 40-W1 to 40-W3 ... windings connected in parallel for each phase, 42 ... partition member, 45 ... teeth part.

Claims (4)

A pump unit for conveying cooling water, an electric motor unit composed of a rotor unit and a stator unit, a drive control unit for driving and controlling the electric motor unit, and the electric motor unit located between the drive control unit and the electric motor unit An internal combustion engine configured to drive the pump unit by rotating the rotor unit of the motor unit by supplying a drive signal from the drive control unit to a winding wound around the stator unit. In the engine electric fluid pump,
A partition member that separates the stator portion and the rotor portion is provided between the stator portion and the rotor portion, and the rotor portion is rotatably housed inside the partition member and is near the pump portion Cooling water from
The U-phase, V-phase, and W-phase individual windings constituting the motor section are divided into at least two or more windings and connected in parallel, and the divided windings correspond to the stator section. Winding around the salient pole
An electric fluid pump for an internal combustion engine, wherein a tooth portion formed at a tip of the salient pole portion is brought into contact with an outer periphery of the partition member. The electric fluid pump for an internal combustion engine according to claim 1,
The stator portion has at least six salient pole portions including the teeth portions that extend inward and have arcs that overlap on the same circumference, and a circular outer peripheral surface of the partition member is An electric fluid pump for an internal combustion engine, wherein the six or more salient pole portions are in contact with the arc of the teeth portion. The electric fluid pump for an internal combustion engine according to claim 2,
An electric fluid for an internal combustion engine, wherein a contact surface between the circular outer peripheral surface of the partition member and the arc of the teeth portion of the six or more salient pole portions is fixed by a heat dissipating adhesive. pump. The electric fluid pump for an internal combustion engine according to claim 2,
The heat transmitted from the arc of the teeth portion of the six or more salient pole portions to the circular outer peripheral surface of the partition member is at least the heat generated in the winding and the internal combustion engine that receives heat from the surrounding environment. An electric fluid pump for an internal combustion engine, characterized in that the heat is generated by operation.

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