JP2006180643A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control circuit integrated motor capable of being downsized by improving the layout capability of electronically controlled parts mounted on a control substrate. <P>SOLUTION: A first substrate casing 1a mounted on the motor body A is bent to a mounting section 5 of an output shaft 3 to partially increase a storage space 9 of the electronically controlled parts 10 formed between the first substrate casing 1a and a second substrate casing 1b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a control circuit-integrated electric motor that can improve the layout of an electronic control component mounted on a control board and realize downsizing.

Conventionally, a control circuit for driving and controlling an electric motor is mounted on a control board and arranged at an appropriate distance from the electric motor main body, or in order to improve wiring and assembling between the electric motor main body and the control circuit. As an electric motor that is integrated with the electric motor main body and integrated with the control circuit and the electric motor main body, for example, a device described in Patent Document 1 below can be cited.
Japanese Utility Model Publication No. 2-139473

  The electric motor described in Patent Document 1 is a DC brushless motor mainly used in a vehicle air conditioner, and has a rotor provided with a field magnet (permanent magnet) so as to be rotatable, and a rotating magnetic field with respect to the rotor. The armature (stator) for generating the armature and the excitation means for exciting the armature are schematically configured.

  The armature (stator) is press-fitted into a casing in a state where a coil is wound in a slot, and the casing closes its opening by screwing together with the peripheral edge of the casing. Further, in the casing, a printed circuit board mounted with an excitation circuit for exciting the armature is attached below the armature (stator), and the permanent magnet fixed to the shaft (rotating shaft) is attached. A predetermined number of sensors for detecting the magnetic pole position are arranged.

  The rotor is composed of an impeller and an annular field magnet (permanent magnet) fixed in a groove formed inside the impeller, and press-fitted into a boss portion provided at the center of the impeller. The shaft is supported by bearings disposed on the casing and the bottom plate, and is rotatably attached by being locked by a washer.

  In the motor configured as described above, the coils of the respective phases of the armature are alternately energized based on the magnetic pole positions of the field magnets, and a rotating magnetic field is generated in the field magnets to rotate the rotor, that is, the blades Acts as a motor that rotates the car. And this motor is distribute | arranged in the air blower case of a vehicle air conditioner, for example, and is used as a blower motor.

  In addition, the motor armature and the excitation circuit mounted on the printed circuit board are surrounded by the casing and the bottom plate, so that air conditioning intake is performed from the outside, and rainwater or the like is mist-like and sucked into the blower Even in this case, it is possible to reliably prevent water droplets or the like from adhering to the armature or the printed circuit board and adversely affecting the motor operation.

  However, when the motor main body and the control circuit are integrated as described above, it is desirable to reduce the size in view of the space for mounting the motor main body. However, in reality, a control board on which the control circuit is mounted on the motor main body is attached. Since it is a structure to do, it was not easy.

  In particular, in recent years when the drive control of electric motors has become complicated, not only thin and small components such as CPU and memory on the printed circuit board, but also relays, capacitors, etc. It is also necessary to arrange a large component for driving the motor. In this case, the space between the armature and the printed circuit board inevitably secures a space (space) in which various electric components can be attached. Since the printed circuit board is disposed, the dimensions of the casing and the bottom plate that accommodate the printed circuit board have to be enlarged, which has been a cause of hindering miniaturization of the motor.

  Further, in addition to the various electrical components on the printed circuit board, when a heat sink that prevents the temperature rise of these electrical components is attached, it is necessary to ensure a wider space between the armature and the printed circuit board. As a result, the increase in size of the motor was further promoted.

  Therefore, in view of the above problems, the present invention provides a control circuit-integrated electric motor that can reliably secure a space for arranging electronic control components for driving and controlling the electric motor without increasing the size of the apparatus. provide.

  According to the first aspect of the present invention, there is provided a control board on which an electronic control component for driving and controlling an electric motor is mounted, a substrate casing for housing the control board, and heat dissipation of the electronic control component to increase the temperature of the electronic control component. The control board is provided between the first board casing fixed to the first board casing and the first board casing. The electronic control component and the heat radiating plate are arranged in a direction perpendicular to the output shaft of the motor from the storage space that is in the immediate vicinity of the fixed position of the first substrate casing and the motor. Arranged in the extended portion on the extended control board.

  According to a second aspect of the present invention, in the first aspect of the present invention, the storage space in which the electronic control component and the heat radiating plate are disposed is enlarged by bending the first substrate casing on the motor side. .

  According to a third aspect of the present invention, in the first and second aspects of the present invention, the heat radiating plate is fixed on the control board and is erected in parallel with the output shaft of the electric motor. The projecting portion of the electronic control component is exposed to the outside of the substrate casing through an opening formed in the first substrate casing, and the electronic control component to be radiated is connected to the control substrate by connecting the terminal portion to the control board. It was configured to stand parallel to the plate and to have its bottom surface abutted against the heat radiating plate.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the heat radiating plate is integrally assembled with the first substrate casing, and a heat radiating protrusion is formed on the first substrate casing. The electronic control component to be radiated is exposed to the outside of the substrate casing from the opened opening, and the terminal portion of the electronic control component is connected to the control board, and the terminal portion is bent to control the electronic control component. It arrange | positioned in parallel with the board | substrate and it contacted the open end surface of the said heat sink, and comprised it.

  According to the first aspect of the present invention, the electronic control component and the heat radiating plate for driving and controlling the electric motor are not disposed in the immediate vicinity of the fixed position between the electric motor and the first substrate casing, and the electric motor can be operated from the fixed position. Since it is configured to be arranged in the extending portion on the control board extending in a direction perpendicular to the rotor shaft of the motor, if the storage space near the fixed position of the electric motor is secured only in a space where the control board can be interposed In addition, since it becomes possible to effectively use the dead space in the substrate casing in the extended portion of the control board, the outer diameter dimension of the electric motor integrated with the control circuit should be made as compact as possible. Can be effective.

  According to the second aspect of the present invention, since a part of the first substrate casing is bent toward the electric motor side, the extended portion of the control substrate on which the electronic control component and the heat sink are arranged is accommodated. The space can be surely expanded, and as a result, the electronic control parts and the like can be effectively arranged without increasing the size of the electric motor.

  According to a third aspect of the present invention, in the extended portion of the control board, the heat radiating plate is arranged upright on the control board, and an electronic control component to be radiated is parallel to the heat radiating plate. Since it is configured to stand on the control board and make the bottom surface of the electronic control component to be radiated contact the heat radiating plate, the layout of various electronic control components is improved, and the electronic control component and the heat radiating plate Can be easily assembled to the control board, which is convenient.

  According to a fourth aspect of the present invention, in the extended portion of the control board, the heat radiating plate is integrally assembled to the first substrate casing, and the electronic control component to be radiated is the control of the extended portion. The terminal part is connected on the substrate, and further, the terminal part is bent vertically so that the longitudinal direction thereof is parallel to the longitudinal direction of the heat radiating plate, and one of the electronic control components is arranged. Since the side surface is in contact with the open end surface of the heat radiating plate, the electronic control component can be easily stored even if the space between the first substrate casing and the second substrate casing is set narrow. Thus, the motor can be easily and reliably reduced in size and is effective.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a longitudinal sectional view showing a brushless motor (hereinafter simply referred to as an electric motor) A used as a blower of an air conditioner for a vehicle, for example. The electric motor A is a stator 2 having a base fixed to a substrate casing 1. An output shaft 3 rotatably provided in the hollow portion of the stator 2, a rotor housing 4 that is fixed in the middle of the output shaft 3 and rotates together with the output shaft 3, and a tip of the output shaft 3 For example, the mounting portion 5 is formed in a sirocco-type fan (not shown) for blowing air (hereinafter simply referred to as a fan).

  The stator 2 includes an armature core 7 fastened to an insulating member 6 disposed on the outer periphery of the output shaft 3 and a multi-pole armature coil 8 wound around the armature core 7. In addition, the substrate casing 1 accommodates a control board 11 in which an electronic control component 10 for controlling switching of the energization current to the armature coil 8 is mounted in the internal space 9 thereof.

  The insulating member 6 includes a first insulating member 6a and a second insulating member 6b, and the first insulating member 6 is disposed in the hollow portion of the armature core 7 from the mounting portion 5 side of the output shaft 3. A small diameter cylinder portion (hereinafter referred to as a small diameter cylinder) 12 is inserted and fixed to the armature core 7, while the second insulating member 6 b is inserted into the hollow portion of the armature core 7 from the substrate casing 1 side. By inserting the small-diameter cylinder 13, the small-diameter cylinder 13 is fixed to the armature core 7 in a state of being in contact with the small-diameter cylinder 12 of the first insulating member 6 a.

  In addition, one bearing 15 is press-fitted between the large-diameter cylindrical portion (hereinafter referred to as a large-diameter cylinder) 14 extending in a direction opposite to the small-diameter cylinder 12 of the first insulating member 6 a and the output shaft 3. As a result, the large-diameter cylinder 16 extending in the direction opposite to the small-diameter cylinder 13 of the second insulating member 6b is press-fitted between the output shaft 3 and the other bearing 17. As a result, it is used as a bearing housing in the same manner as the large diameter cylinder 14, and the output shaft 3 is pivotally supported by the pair of bearings 15 and 17 and is rotatably mounted in the armature core 7. .

  Further, the second insulating member 6b is provided with a plurality of legs (for example, six legs) at the outer peripheral position of the large diameter cylinder 16 along the circumferential direction. 18 protrudes toward the substrate casing 1 side and is assembled integrally with the substrate casing 1 by using a locking claw 19 provided at the open end thereof.

  Further, an opening portion of the rotor housing 4 formed in a substantially bowl shape is fixed to the output shaft 3 so as to be driven to rotate in a direction facing the substrate casing 1 at a midway position of the output shaft 3. On the inner peripheral surface of the rotor housing 4, the rotor magnets 20 are alternately arranged with polarities between the adjacent magnets in the circumferential direction so as to oppose the armature core 7 and the peripheral edge thereof. .

  A thrust stopper 21 is attached between the inner bottom of the rotor housing 4 and the bearing 15 to support the rotor housing 4 in the axial direction. On the other hand, a sensor magnet 22 formed in a substantially hollow top shape is held at the end of the output shaft 3 opposite to the mounting portion 5 by a push nut 23 in the axial direction of the output shaft 3, and the control The sensor (for example, Hall element) 24 mounted on the substrate 11 is disposed opposite to the sensor.

  Thereby, the distance between the sensor magnets 22 and the plurality of sensors 24 arranged on the control board 11 is kept constant. In FIG. 1, reference numeral 25 denotes a wave-shaped washer provided for preloading the bearing 17 and is provided to prevent the vibration and noise of the motor A and the life from being adversely affected. ing.

  Next, the structure of the substrate casing 1 assembled integrally with the electric motor A will be described. The substrate casing 1 includes a first substrate casing 1a as a main body and a second substrate casing 1b as a lid.

  In the first substrate casing 1a, a flange 28 has a fitting hole 26 into which the assembly protrusion 18 of the electric motor A is fitted in a substantially central portion, and a screw hole 27 for mounting the second substrate casing 1b. When the electric motor A is assembled to the first substrate casing 1a, the fitting protrusion 18 is biased toward the inner diameter side to temporarily reduce the fitting dimension, and then into the fitting hole 26. After that, the latching claw 19 provided at the tip of the assembly protrusion 18 is locked to the inner side surface of the first substrate casing 1a by releasing the biased state of the assembly protrusion 18. The electric motor A is attached to the first substrate casing 1a, which is the main body, so as not to be removable.

  On the other hand, the second substrate casing 1b has a substantially flat pan shape with a flange 29 at the periphery that contacts the flange 28 of the first substrate casing 1a. The flange 29 has a through hole 31 through which a screw 30 is inserted. Is formed.

  Then, in a state where the flange 29 of the second substrate casing 1b is in contact with the flange 28 of the first substrate casing 1a, the first substrate casing 1a is passed through the through hole 31 formed in the flange 29 of the second substrate casing 1b. By screwing the screw 30 into the screw hole 27 formed in the flange 28, the second substrate casing 1b is mounted on the first substrate casing 1a as a lid. As a result, a fixed storage space (hereinafter referred to as storage space) 9 is formed between the first substrate casing 1a and the second substrate casing 1b.

  In the storage space 9, the control substrate 11 extends from the inner surface of the first substrate casing 1 a with respect to a screw receiver 32 in which a screw hole (not shown) is formed in the central portion along the longitudinal direction. The screw 33 is fastened and accommodated.

  In addition, a coil terminal pin (not shown) of the armature coil 8 is electrically connected to the control board 11 through a receptacle 34. In addition to the sensor 24, the control board 11 includes an electronic control component 10 that switches the energization current to the armature coil 8 from the vicinity of the fixed position of the motor A and the board casing 1. The extension part of the control board 11 located on the edge side of the control board 11 extending in the direction perpendicular to the axial direction, that is, the position deviated from the position closest to the fixed position of the electric motor A and the first board casing 1a (FIG. 1). (Lower) are arranged together.

  The operation of the motor A having the above configuration will be described. When a power switch (not shown) of the motor A is turned on, the electronic control component 10 mounted on the control board 11 has a power supply voltage required for each operation. Supplied. Thereby, the sensor 24 arranged in the vicinity of the sensor magnet 22 detects the magnetic pole of the sensor magnet 22 facing the sensor magnet 22, and the electronic control component 10 on the control board 11 is connected to the electric machine according to the detected magnetic pole. The child coil 8 is energized.

  When the armature coil 8 is energized, the output shaft 3 starts to rotate via the rotor housing 4 due to the magnetic force generated between the magnetic field generated thereby and the rotor magnet 20.

  When the output shaft 3 starts to rotate, the rotational position of the rotor magnet 20 is detected by the sensor 24, so that the armature coil is controlled by the electronic control component 10 on the control board 11 according to the rotational position of the rotor magnet 20. The energizing current for 8 is sequentially switched.

  As a result, the rotor housing 4 and the output shaft 3 are rotated by the magnetic force generated between the magnetic field sequentially generated by switching the energization current to the armature coil 8 and the rotor magnet 20, and the tip of the output shaft 3 is rotated. The fan for ventilation provided in the mounting portion 5 formed in the above is rotated.

  Next, the improvement of the layout of the electronic control component 10 which is the gist of the present invention will be described with reference to FIG. FIG. 2 is an enlarged vertical cross-sectional view showing a main part of the storage space 9 in the substrate casing 1 of the electric motor A shown in FIG. 1 in which the electronic control component 10 is stored. In FIG. The first substrate casing 1a, which is locked and fixed to the assembly protrusion piece 18 of the electric motor A, is bent once in the direction parallel to the output shaft 3 toward the mounting portion 5 side of the output shaft 3 to form a substantially bowl shape. It is a stepped part.

  Reference numeral 35 denotes a heat radiating plate made of aluminum or the like fixed to the control board 11 with screws 36, and is erected on the control board 11 so that its longitudinal direction is parallel to the output shaft 3. The open end extends in a direction perpendicular to the longitudinal direction along the inner surface of the first substrate casing 1a.

  Further, the heat radiating plate 35 is formed with, for example, a plurality of protrusions 37 having a bowl shape, and the protrusions 37 are exposed to the outside of the substrate casing 1 from the openings 38 formed in the first substrate casing 1a. And the heat dissipation effect is obtained. Further, for example, a sealing material S made of silicon resin or the like is interposed between the first substrate casing 1a and the heat radiating plate 35, thereby reliably preventing dust and dirt from entering the substrate casing 1. is doing.

  Reference numeral 39 denotes, for example, a field effect transistor (FET) to be radiated, which is electrically connected to the control board 11 with terminal pins 40 and is erected in parallel with the heat radiating plate 35. The field effect transistor (FET) ) With the sealing member 35a made of silicon resin or the like improving the effect of transferring the heat generated in 39 to the heat radiating plate 35, the screw 41 is in contact with the heat radiating plate 35 with its bottom surface in contact with the heat radiating plate 35. The heat radiating plate 35 is screwed. Further, reference numeral 42 shown in FIG. 2 denotes a capacitor disposed in the vicinity of the field effect transistor (FET) on the control substrate 11.

  That is, as shown in FIG. 2, the electric motor of the present invention has the first substrate casing 1 a in a substantially bowl shape at a portion continuous from the locking portion of the assembly protrusion piece 18 of the first substrate casing 1 a. Therefore, the storage space 9 in the substrate casing 1 can be enlarged at the portion where the step portion 34 is formed.

  As a result, it is necessary for driving the electric motor A such as a heat sink 35 and a capacitor 42 as shown in FIG. 2 as well as a relatively thin and small component represented by a program control electric component such as a CPU and a memory. Large parts can be reliably arranged.

  Further, since the step 34 is formed by bending the first substrate casing 1a toward the mounting portion 5 side of the output shaft 3 shown in FIG. The storage space 9 inside the substrate casing 1 can be reliably expanded without increasing the size of the motor A that has been made as a whole apparatus.

  Then, overheating of the heat radiation target component (in FIG. 2, the field effect transistor (FET) 35) generated when the electric motor A is continuously driven is caused by the heat radiation plate 35 in contact with the bottom surface of the FET 39. The heat is dissipated, and the temperature rise of the FET 39 can be reliably suppressed.

  FIG. 3 is a longitudinal sectional view of an electric motor A showing another embodiment of the present invention. 3 and 4, the same parts as those shown in FIGS.

  3 is different from FIG. 1 in that the thickness of the substrate casing integrated with the electric motor A can be made thinner than that shown in FIG. That is, a pair of hooking claws 43 having an L-shaped longitudinal section shown in FIG. 4 are formed in the vicinity of the opening 38 of the first substrate casing 1c fixedly fixed to the electric motor A shown in FIG. The heat sink 44 that prevents the temperature rise of the electronic control component 10 by using the portion 43 is formed integrally with the first substrate casing 1a, so that dust and dirt enter the substrate housing 1 from the outside. Is surely prevented.

  The heat radiating plate 44 is attached in the storage space 9 inside the substrate casing 1 with its longitudinal direction along the longitudinal direction of the first substrate casing 1a, and an opening 38 formed in the first substrate casing 1a. For example, a plurality of protrusions 45 formed in a bowl shape are exposed to the outside to obtain a heat dissipation effect.

  Further, for example, a field effect transistor (FET) 39, which is a heat dissipation target electrically connected to the control board 11, has, for example, a field effect transistor (FET) 39 at the open end surface of the heat radiating plate 44. By bending in the direction, the one end face is arranged in contact with each other through a sealing material 44a made of silicon resin or the like that improves heat transfer efficiency.

  In this state, the field effect transistor (FET) 39 is screwed into the heat radiating plate 44 by screwing a screw 41 from the other end surface located on the side opposite to the side surface in contact with the heat radiating plate 44. The housing space 9 is prepared so as not to swing by being fixed integrally with the plate 44 and further by interposing an insulating spacer 46 between the control board 11 and the substrate 44.

  That is, the electric motor A shown in FIG. 3 has the first substrate when the electronic control component 10 is disposed in the storage space 9 partially enlarged by forming the step portion 34 in the first substrate casing 1c. Since the longitudinal direction of the casing 1c and the longitudinal direction of the heat radiating plate 44 coincide with each other and are integrally assembled using the pair of hooking claws 43, the heat radiating plate 44 can be arranged side by side. Thus, the spatial distance between the first substrate casing 1c and the second substrate casing 1d can be reduced.

  In addition, a terminal pin 40 is electrically connected to the control board 11 on the open end surface of the heat radiating plate 44, and a field effect transistor (FET, for example), which is a heat dissipation object in which the terminal pin 40 is bent at an intermediate position. ) 39 is disposed so that one side surface thereof is in contact with the sealant 44a, and is fixed to the heat radiating plate 44 by a screw 41, and is also controlled with the other end surface of the field effect transistor (FET) 39. Since the insulating spacer 46 is interposed between the substrates 11 and is fixed in the substrate casing 1 so as not to swing, the storage space 9 for the electronic control component 10 can be made as compact as possible. Thus, the overall size of the apparatus can be reduced.

  As described above, the electric motor according to the present invention is configured such that the first substrate casing and the second substrate casing are configured by once bending the first substrate casing attached to the motor body toward the mounting portion side of the output shaft. A part of the storage space formed by joining to the device can be easily expanded without causing the entire apparatus to be enlarged, and the electronic control component is accommodated in the expanded storage space to reduce the size of the substrate casing. It becomes possible.

  In addition, the longitudinal direction of the heat sink is arranged along the longitudinal direction of the first substrate casing, and the terminal pin is electrically connected to the control board on the open end surface of the heat sink, and the terminal pin is located at a midway position. By arranging the electronic control parts to be radiated in contact with each other, the space between the first substrate casing and the second substrate casing can be further reduced, and the entire apparatus Can be made compact.

  An electric motor integrated with a control circuit that can be made compact, partially expanding the storage space of the control board on which the control circuit is mounted, and the layout of the control circuit mounted on the control board By improving the above, it is possible to effectively reduce unnecessary dead space existing in the substrate casing, and to realize downsizing of the entire apparatus.

1 is a longitudinal sectional view showing an electric motor integrated with a control circuit according to the present invention. It is a principal part expanded longitudinal cross-sectional view of the said electric motor. It is a longitudinal cross-sectional view of the electric motor integrated with a control circuit according to another embodiment. It is a principal part expansion longitudinal cross-sectional view of the motor integrated with a control circuit concerning another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Board | substrate casing 1a 1st board | substrate casing 1b 2nd board | substrate casing 2 Stator 3 Output shaft 4 Rotor housing 5 Mounting part 6 Insulation member 6a 1st insulation member 6b 2nd insulation member 7 Armature core 8 Armature coil DESCRIPTION OF SYMBOLS 9 Storage space 10 Electronic control part 11 Control board 12, 13 Small diameter cylinder 14, 16 Diameter large cylinder 15, 17 Bearing 18 Assembly protrusion 19 Locking claw 20 Rotor magnet 21 Thrust stopper 22 Sensor magnet 23 Push nut 24 Sensor 25 Washer 26 Fitting hole 27 Screw hole 28, 29 Flange 30, 33, 36, 41 Screw 31 Through hole 32 Screw receiver 34 Receptacle 35, 44 Heat radiation plate 35a, 44a, S Seal member 37, 45 Protrusion part 38 Opening part 39 Field effect transistor (FET)
40 Terminal Pin 42 Capacitor 43 Hook Claw 46 Insulating Spacer A Electric Motor

Claims (4)

  A control board on which an electronic control component for driving and controlling the electric motor is mounted; a substrate casing that houses the control board; and a heat sink that radiates heat from the electronic control component to suppress a temperature rise of the electronic control component; The substrate casing is a first substrate casing fixed to the electric motor, and a second substrate casing is fixed to the first substrate casing to form a storage space for the control substrate between the first substrate casing and the second substrate casing. The electronic control component and the heat radiating plate are on the control board extending in a direction perpendicular to the output shaft of the motor from the storage space that is in the immediate vicinity of the fixed position of the first board casing and the motor. An electric motor characterized by being arranged in the extended portion.   2. The electric motor according to claim 1, wherein the storage space in which the electronic control component and the heat radiating plate are arranged is partially enlarged by folding a first substrate casing on the electric motor side.   The heat radiating plate is fixed on the control board and stands parallel to the output shaft of the motor, and a heat radiating protrusion formed at an open end of the heat radiating plate is formed through an opening formed in the first substrate casing. The electronic control component that is exposed to the outside of the casing and that is to be radiated heats up its terminal portion in parallel with the heat radiating plate by connecting the terminal portion to the control board, and the bottom surface portion is abutted against the heat radiating plate. The electric motor according to claim 1, wherein the electric motor is configured to be in contact with each other.   The heat radiating plate is assembled integrally with the first substrate casing, and a heat radiating projection is exposed to the outside of the substrate casing through an opening formed in the first substrate casing. The electronic control component connects the terminal portion to the control board, bends the terminal portion and arranges the electronic control component in parallel with the control board, and opens one side surface of the heat dissipation plate. The electric motor according to claim 1, wherein the electric motor is configured to abut on an end face.

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