JP2008072794A - Motor, blow fan, and manufacturing method for blow fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To change stored data after the data are written into the internal memory of a microcomputer IC mounted on a circuit board of a brushless DC motor. <P>SOLUTION: The circuit board 110 includes the microcomputer IC 12, which incorporates a memory storing a control program for carrying out a feedback control of PWM control and data necessary for other controls. The circuit board 110 includes a motor control unit including the microcomputer IC 12 on the surface of the side facing a base part 80. A rewriting terminal part 150, which changes the data stored in the memory incorporated in the microcomputer IC 12, is formed on the surface of the armature 10 side of the circuit board 110. The probe 160 of the control cable of an external rewriting device is inserted from one end side (the armature 10 side with respect to the circuit board 110) of a housing 2, to rewrite the stored data in the internal memory of the microcomputer IC 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a brushless DC motor including a rotation control unit that controls rotation at the time of driving based on data stored in a memory, and a drive circuit unit that supplies a rotation driving current based on the control of the rotation control unit. It is.

  Brushless DC motors are used in a wide range of applications such as OA equipment, home appliances, and in-vehicle equipment. Some of these brushless DC motors require high-precision control according to the purpose of the equipment to be mounted.

  Some motor control units of such brushless DC motors are equipped with an IC equipped with a microcomputer (hereinafter referred to as a microcomputer). This motor control unit operates a memory control program built in the microcomputer IC based on information such as the rotation state of the motor and ambient temperature, or information from the device on which the motor is mounted, and sends it to the stator. By supplying this rotational drive current, complicated control can be realized as compared with a control method using an analog circuit without a microcomputer IC (for example, Patent Document 1 and Patent Document 2).

  As a memory built in the microcomputer IC of the motor control unit, a read-only non-volatile memory (ROM) is used for reasons such as cost. The microcomputer IC incorporating the ROM is mounted on a predetermined circuit board in a state in which a control program such as a feedback control program and other data necessary for control are written in advance, and the circuit board on which the microcomputer IC is mounted is brushless. It is attached to a predetermined part of the DC motor.

  Such a brushless DC motor has an advantage that even if it has the same circuit configuration, various rotation states can be set only by changing the stored data stored in the memory.

JP 2004-120980 A

JP 2002-58280 A

  By the way, there are two types of ROM built in the microcomputer: ROM (one-time ROM) that can be written only once and ROM (flash memory) that can be written and changed any number of times. In the case of a microcomputer IC with a built-in inexpensive one-time ROM, if a sudden design change occurs, the contents written in the ROM cannot be changed, so replace with a new microcomputer IC and discard the microcomputer IC before the change. Or, it will be stored until it is reused in another model, resulting in extra costs. Furthermore, when the microcomputer IC is already mounted on the circuit board or when the circuit board is already attached to the motor, it may be necessary to replace the microcomputer IC having the one-time ROM. In the case as described above, the man-hour for exchanging the microcomputer IC becomes great, and the assembling work efficiency is greatly reduced. The above-described change in the stored data in the ROM is an operation that often occurs in the design of the motor control unit. Therefore, although the microcomputer IC with a built-in one-time ROM itself is inexpensive, one of the causes is the work of changing stored data. As a result, the conventional brushless DC motor operated by microcomputer control is expensive. And had problems such as taking time for commercialization.

  Therefore, in a brushless DC motor equipped with a microcomputer IC, it is necessary to be able to easily change stored data during or after motor assembly. However, the location where the circuit board is arranged in the brushless DC motor is often inside the motor, and it is often difficult to access the circuit board from the outside. In general, a brushless DC motor often exposes a part of a circuit board by removing a rotor portion which is a rotating body. For this reason, in a brushless DC motor, access from the rotor side (that is, the armature side) of the circuit board is often possible.

  In view of the above, an object of the present invention is to provide a brushless DC motor that can change the stored data after the motor is assembled when it becomes necessary to change the stored data after writing the stored data to the memory. It is to be.

  In order to achieve the above-described object, a brushless DC motor of the present invention is based on a rotation control unit that controls rotation at the time of driving based on stored data in a rewritable nonvolatile memory, and based on the control of the rotation control unit. And a drive circuit unit for supplying a rotation drive current, and the stored data can be rewritten at any time when the rotation of the motor is stopped, and a rewrite terminal is provided so that an external writing device can be connected to the memory. It is characterized in that it can be connected from the outside of the motor.

  More specifically, the motor according to claim 1 of the present invention is an electric motor, and includes a rotor holder having a substantially cylindrical peripheral wall portion, and an annular rotor magnet fixed to the inner peripheral surface of the peripheral wall portion of the rotor holder. And a bearing portion that rotatably holds the rotor holder around a rotation axis, a bearing housing that supports the bearing portion, and a bearing housing or a base portion thereof, and a torque is generated between the rotor magnet. And a circuit board disposed on the base side and electrically connected to the armature. The circuit board includes a rewritable nonvolatile memory and a storage of the memory A rotation control unit for controlling rotation at the time of driving based on the data, and a drive circuit unit for supplying a rotation driving current to the motor based on the control of the control unit. Sometimes, a rewrite terminal for connecting a rewrite control cable connected to an external writing device to the rewritable memory of the circuit board is provided on the circuit board, and the rewrite terminal is connected to the circuit board with respect to the circuit board. It is arranged to be connectable from the armature side.

  A motor according to a second aspect of the present invention is the motor according to the first aspect, wherein the circuit board and the base portion face each other in the axial direction, and the surface of the circuit board on the base portion side. Is substantially covered by the base portion.

  A motor according to a third aspect of the present invention is the motor according to the first or second aspect, wherein an insulating material is disposed in a gap between the circuit board and the base portion, and the base of the circuit board. The part-side surface is substantially covered with the insulating material.

  A blower fan according to a fourth aspect of the present invention is a blower fan on which the motor according to any one of the first to third aspects is mounted, the hub being fixed to the outer surface of the peripheral wall portion of the rotor holder, and the hub And a plurality of blades that generate an air flow by rotating.

  A blower fan according to a fifth aspect of the present invention is the blower fan according to the fourth aspect, wherein the blower fan includes a housing that surrounds the blade from the outside.

  A blower fan according to a sixth aspect of the present invention is the blower fan according to the fourth or fifth aspect, wherein the circuit board includes a projecting portion projecting radially outward from the hub, and the rewrite terminal. Is provided in the projecting portion.

  A method for manufacturing a blower fan according to a seventh aspect of the present invention is the method for manufacturing a blower fan according to any one of the fourth to sixth aspects, wherein the circuit board and the armature are attached to the base portion. In this state, the write terminal connected to the external writing device is brought into electrical contact with the rewriting terminal formed on the circuit board from the armature side, and the signal output by the external writing device is And a step of writing the stored data to the memory by being transmitted to the memory provided on a circuit board.

  A method for manufacturing a blower fan according to an eighth aspect of the present invention is the method for manufacturing a blower fan according to any one of the fourth to sixth aspects, wherein a) the circuit board and the armature are electrically connected. A step of connecting; b) a step of fixing the armature including the circuit board to the base portion; and c) a connection from the armature side to an external writing device with respect to a rewrite terminal formed on the circuit board. And writing the stored data into the memory by electrically contacting the written write terminal and transmitting a signal output by an external writing device to the memory provided on the circuit board. It is characterized by.

  A method for manufacturing a blower fan according to a ninth aspect of the present invention is the method for manufacturing a blower fan according to any one of the fourth to sixth aspects, wherein a) the circuit board and the armature are electrically connected. A step of connecting, b) a step of fixing the armature including the circuit board to the base portion, c) a step of rotatably holding a rotating body including the rotor holder around the rotation axis, and d) A step of inspecting the rotating operation of the rotating body, e) a step of removing the rotating body of the blower fan which is recognized as abnormal in the inspection, and f) the electric machine with respect to a rewrite terminal formed on the circuit board. From the slave side, a write terminal connected to the external writing device is brought into electrical contact, and a signal output by the external writing device is transmitted to the memory provided on the circuit board, whereby the memory is supplied with the signal. And writing the 憶 data, and having a.

  A method for manufacturing a blower fan according to a tenth aspect of the present invention is the method for manufacturing a blower fan according to any one of the fourth to sixth aspects, wherein the rotary body is rotatably attached. A) removing the rotating body of the blower fan; and b) electrically contacting a write terminal connected to an external writing device from the armature side with respect to the rewrite terminal formed on the circuit board. A step of writing the stored data in the memory by transmitting a signal output by an external writing device to the memory provided on the circuit board; and c) rotating the rotating body around the rotation axis. And a step of holding it freely.

  The brushless DC motor of the present invention is configured so that it can be connected to a non-volatile memory rewritable by an external writing device at any time when the power of the motor is stopped. Therefore, the data stored in the memory can be changed from the outside for the assembled brushless DC motor.

  In particular, in the present invention, a rewrite terminal enabling access to the memory is formed on the armature side surface of the circuit board. For this reason, when the circuit board cannot be accessed from the outside with respect to the brushless DC motor, the write terminal is brought into electrical contact with the rewrite terminal formed on the circuit board by removing the rotor portion, and the stored data is stored. It is possible to change. Thereby, it is possible to easily change the specification after the product is completed.

  A mode for carrying out the present invention will be described with reference to FIGS. In this embodiment, the case where a brushless DC motor is used as an axial fan for cooling the inside of a personal computer is illustrated. In the following description, the axial direction indicates the longitudinal direction of the rotation axis, and the radial direction indicates a direction perpendicular to the axis passing through the rotation center.

  FIG. 1 is a perspective view of an axial fan. FIG. 2 is a cross-sectional view of the axial fan shown in FIG. FIG. 3 is a plan view of the axial fan with no rotating body attached. FIG. 4 is a perspective view showing a probe (tip portion of a rewrite control cable) connected to an external writing device for rewriting data stored in a rewritable memory. 5 to 10 are views showing modifications in which a part of the axial fan shown in FIG. 1 is changed.

  An axial fan 1 in FIG. 1 includes a motor (brushless DC motor) with an impeller 4 provided with an impeller (air blowing means) 4 and a housing 2 that surrounds the impeller 4 and supports the motor. . The housing 2 includes a cylindrical body 3 that surrounds the impeller 4 from the outside, upper and lower flanges 30 and 35 formed outside both open ends of the cylindrical body 3, and an interior of one open end of the cylindrical body 3. A disk-like base portion (motor support portion) 80 for supporting the motor with the impeller 4, and a plurality of support arms extending radially to support the base portion 80 inside the cylindrical body 3. (Connecting portion) 9 and is integrally formed of synthetic resin. The air gap formed between the cylindrical body 3 and the base portion 80 constitutes an air flow path through which the air flow sucked from the other opening end of the cylindrical body 3 passes through the rotation of the impeller 4. It is discharged to the outside of the housing 2. Since the base portion 80 includes an outer peripheral wall protruding toward the impeller 4 side, the base portion 80 has a circular concave portion that is recessed inward.

  As shown in FIG. 2, the impeller 4 is provided in a cup-shaped motor case 6 that fits the motor body 5 of the motor with the impeller 4 and is attached to the rotation side of the motor, and an outer peripheral portion of the motor case 6. It consists of a plurality of blades 7. The motor body 5 is provided with a cylindrical bearing housing in the center of the base portion 80, a pair of bearings are fixed inside the bearing housing, and the armature 10 is fixed outside. In the pair of bearings, the inner ring is fixed to a shaft 5A provided at the center of the impeller 4, and supports the impeller 4 in a rotatable manner. A driving magnet is fixed inside the motor case 6 via a yoke and faces the armature 10. In the armature 10, a coil is wound around a predetermined portion of a stator core formed by stacking silicon steel plates via an insulator. In the motor with impeller 4, the bearing housing and the base portion 80 constitute a stationary body, and the yoke and the shaft 5A constitute a rotating body.

  The motor control unit of the motor body 5 includes a non-volatile memory (flash memory) that can be rewritten any number of times, a rotation control unit that controls rotation during driving based on data stored in the memory, and the rotation control unit And a drive circuit unit that supplies a rotational drive current to the armature 10 based on the control of the above, and is configured to perform feedback control of PWM (pulse width modulation) control using a microcomputer. For this purpose, the circuit board 110 includes a microcomputer IC 12 having a built-in memory in which a control program for performing feedback control of the PWM control and other data necessary for control are stored.

  As shown in FIG. 2, the circuit board 110 is soldered to a plurality of connection pins provided on the insulator of the armature 10 and fixed to the armature 10. In addition, a coil is wound around the connection pin, and the coil and the circuit board 110 are electrically connected via the connection pin.

  An external connection terminal portion 13 including a plurality of terminals 131 connected to an external power supply or an external control circuit is provided near the outer periphery of the surface on the base portion 80 side of the circuit board 110. A cable M connected to an external power supply or an external control circuit is soldered to the external connection terminal portion 13. As shown in FIG. 1, a cable lead-out opening 14 that opens in the axial direction and toward the outside of the motor is formed in a portion of the base portion 80 that faces the external connection terminal portion 13. The cable M connected to each terminal 131 is drawn out of the housing 2 along the support arm 9.

  The circuit board 110 is accommodated in the base portion 80 as shown in FIG. The circuit board 110 includes a motor control unit including the microcomputer IC 12 on the surface facing the base unit 80. On the surface of the circuit board 110 on the armature 10 side, a rewrite terminal portion 150 for changing data stored in a memory built in the microcomputer IC 12 is formed.

  The rewrite terminal unit 150 includes, for example, five terminals 155, is formed of lands on which solder is surface-mounted, and is connected to the built-in memory via a predetermined wiring pattern (not shown). The rewrite terminal unit 150 can rewrite the data stored in the built-in memory by connecting a control cable drawn from the rewrite unit of the external rewrite device. In this embodiment, a probe 160 is provided at the tip of the control cable in order to easily bring the control cable into contact with the rewrite terminal portion 150.

  The shaft 5 </ b> A of the axial fan 1 is prevented from coming off by fitting a wire ring such as a C ring into an annular groove at the tip of the shaft. By removing the wire ring, the configuration of the shaft 5A to prevent the removal is released. Therefore, the axial fan 1 can easily remove the impeller assembly 40 (rotating body) including the shaft 5A, the yoke, the driving magnet, and the impeller 4. Moreover, also when attaching, a shaft 5A is inserted in a bearing part, and a retaining is easily comprised by inserting a wire ring.

  In the axial fan 1, when rewriting the stored data in the memory, the power supply is stopped and the external impeller assembly 40 is not attached as shown in FIGS. 3 and 11. The probe 160 of the control cable of the rewriting device is inserted in the axial direction from one end side of the housing 2 (the armature 10 side with respect to the circuit board 110), and the tip of the probe 160 is brought into contact with the rewriting terminal portion 150. In this state, the stored data in the built-in memory of the microcomputer IC 12 can be rewritten by operating the external rewriting device. After this rewriting operation is completed, the memory is protected so that it cannot be accessed as it is in order to prevent leakage or falsification of data stored in the memory.

  When the circuit board 110 of the present embodiment is viewed from the axial direction, the circuit board 110 is almost entirely covered with the base portion 80. Therefore, in a state where the impeller assembly 40 is incorporated, the circuit board 110 is not substantially exposed toward the outside of the motor, and therefore the tip of the probe 160 cannot be brought into contact with the circuit board 110 from the base portion 80 side. Alternatively, since a notch or a through hole into which the probe 160 can be inserted is not formed in a part of the base portion 80, the tip of the probe 160 cannot be brought into contact with the circuit board 110 from the base portion 80 side. Therefore, the rewriting operation of the stored data is performed in a state where the impeller assembly 40 is not incorporated.

  As described above, the rewriting operation of the stored data is performed by inserting the probe 160 in the axial direction from one end side of the housing 2 in a state where the impeller assembly 40 is not incorporated. When the axial fan 1 is viewed in the axial direction from the armature 10 side, the armature 10 does not protrude into the projection range in the axial direction, so that the rewrite terminal portion 150 has good visibility. Therefore, it is easy for an operator to work when bringing the probe 160 into contact with the writing terminal unit 150. Further, even when the probe 160 is operated by an automatic machine, the probe 160 can be linearly moved in the axial direction, so that the drive mechanism of the automatic machine can be simplified.

  Since the probe 160 of the control cable is configured to contact the rewrite terminal unit 150 in the axial direction, when the probe 160 contacts the rewrite terminal unit 150, the circuit board 110 is supported and the probe 160 is surely connected to the rewrite terminal unit 150. Can be contacted. When there is a possibility that each terminal 161 of the probe 160 bends due to the pressing force when the probe 160 is brought into contact with the rewritten terminal portion 150, each terminal 161 may be configured to have elasticity. For example, there is a method of providing an elastic terminal 152 in the rewrite terminal portion 150 as shown in FIG.

  Thus, in the axial fan 1 of this embodiment, the stored data can be changed even after predetermined stored data is written in the built-in memory of the microcomputer IC 12. Since the built-in memory is a flash memory, the stored data can be changed any number of times. In the conventional axial fan, when the stored data needs to be rewritten after the axial fan 1 is assembled, the circuit board 110 has to be removed. The operation of removing the circuit board 110 needs to be performed carefully so as not to damage the circuit components including the circuit board 110-like microcomputer IC 12 and the like. Therefore, a great man-hour is required for removing the circuit board 110. Depending on the mounting structure of the circuit board 110, the assembled axial fan 1 must be discarded. Therefore, in the present invention, even if it is required to change the stored data by design change after writing predetermined stored data in the built-in memory of the microcomputer IC, the members such as the microcomputer IC 12 and the circuit board 110 are discarded or The data can be changed quickly without any member replacement work.

  The advantage of this embodiment can be clarified by comparing with the following comparative example. As a comparative example, in a configuration incorporating a memory (one-time ROM) that can be written only once in the microcomputer IC, when changing the stored data as described above, a new microcomputer IC is prepared, and before the change. Extra steps such as removing the microcomputer IC or removing each circuit board are added. In some cases, the axial fan 1 may be discarded. Furthermore, a process of re-mounting the new microcomputer IC on the circuit board is also added. It is necessary to take measures such as discarding the removed microcomputer IC before the change or storing it until it is reused. As a result, in this comparative example, there is a significant increase in cost for such a request and an extra time is required for assembling, and the assembling work efficiency is significantly reduced.

  The method for rewriting the stored data described above is not limited after the axial fan 1 is assembled, and can be applied during the assembly. Before the circuit board 110 is incorporated into the housing 2, the circuit board 110 can be accessed from various directions, and writing and rewriting operations can be easily performed. However, after the circuit board 110 is incorporated in the housing 2, the direction in which the probe 160 is accessed to the circuit board 110 is limited. Therefore, the restriction on the direction in which the probe 160 is accessed to the circuit board 110 occurs in a state where the circuit board 110 is incorporated in the housing 2 (base portion 80) regardless of the completion of the axial flow fan 1. Therefore, the present invention is applicable even before the impeller assembly 40 is assembled.

  For example, when the data stored in the microcomputer IC 12 needs to be changed immediately before the product of the axial fan 1 is shipped, the data is changed through a process as shown in FIG. First, the impeller assembly 40 is removed. By removing the C-ring fixed near the tip of the shaft 5A, the shaft 5A can be moved in the axial direction, and the impeller assembly 40 can be easily removed. By removing the impeller assembly 40, the write terminal portion 150 formed on the circuit board 110 is exposed. The stored data is changed by bringing the probe 160 into electrical contact with the write terminal unit 150. Thereafter, the impeller assembly 40 is attached. Next, the rotation of the impeller assembly 40 is confirmed. The rotation confirmation is mainly an electrical inspection, and is a confirmation inspection of the waveform of the current flowing through the motor when the impeller assembly 40 rotates, the rotational speed, and the like. It is confirmed that the stored data changed by the rotation confirmation is correct, and the axial fan 1 is shipped. When a write error of stored data changed by the rotation confirmation occurs, the impeller assembly 40 is removed again, and the stored data is rewritten.

  Next, a general manufacturing process (focusing on stored data rewriting work) of the axial fan 1 as shown in FIG. 13 will be described. In the previous process, the microcomputer IC 12 stores data for controlling rotation in the memory. Data writing to the microcomputer IC 12 is performed in a state of being mounted on the circuit board 110. Therefore, the microcomputer IC 12 storing the predetermined data is put into the production process of the axial fan 1 while being mounted on the circuit board 110. The circuit board 110 is electrically connected to a terminal of a coil wound around the armature 10. Next, the electrically connected circuit board 110 and the armature 10 are assembled into the base portion 80 of the housing 2. At this time, the armature 10 is fixed to the outer peripheral surface of the bearing housing formed integrally with the central portion of the base portion 80 with an adhesive. Therefore, the armature 10 and the circuit board 110 cannot be easily removed from the housing 2 after the adhesive is cured.

  Next, a pair of ball bearings are fixed in the bearing housing. Next, the shaft 5A which is a part of the impeller assembly 40 is rotatably held by the ball bearing. By supplying power to the circuit board 110 in this state, the impeller assembly 40 is assembled to a rotatable state. Therefore, power is supplied to the circuit board 110 and the rotation state of the impeller assembly 40 is confirmed. What is confirmed here is mainly the rotational speed of the impeller assembly 40, the waveform of the current flowing in the motor, the rotational speed of the impeller assembly 40 when a control signal is sent, and the like. These are provided with a certain reference, and when a value outside the specified range is indicated, it is determined that there is an abnormality in the rotational state. Abnormalities include a data write error to the microcomputer IC 12, writing different data to the microcomputer IC 12, damage to the microcomputer IC 12 itself, damage to circuit components other than the microcomputer IC 12, and the like. If it is recognized that there is a rotation abnormality, the impeller assembly 40 is removed, the stored data is rewritten again, and the same process is repeated through the same process until the rotation state becomes normal.

  The present invention is applied particularly when the probe 160 cannot be accessed from the base unit 80 side with respect to the circuit board 110. For example, as described above, when the circuit board 110 is viewed from the axial direction, the circuit board 110 may be substantially entirely covered by the base portion 80. In other cases, an electrically insulating material 200 may be interposed between the circuit board 110 and the base portion 80 as shown in FIG. When the housing 2 is formed of a conductive material (for example, an aluminum die-cast product), an electrically insulating material 200 is disposed to prevent electrical conduction between the circuit board 110 and the base portion 80. The In this case, when the probe 160 is made to access the circuit board 110 from the base portion 80 side, the electrically insulating material 200 is disposed, so that the electrically insulating material 200 becomes an obstacle to the circuit board 110. I can't access it.

  The axial fan 1 may be used in a severe environment such as high temperature and high humidity. In such a case, as shown in FIG. 15, it is necessary to perform moisture-proof treatment on the surface of the circuit board 110 on which the circuit components including the microcomputer IC 12 are formed. As the moistureproof agent 201 used for the moistureproof treatment, an insulating material formed of a material such as polyolefin, acrylic, polyurethane, or silicon as a main component is used. The desiccant 201 is applied so as to cover the surface of the circuit board 110 on the base portion 80 side (that is, the surface on which circuit components including the microcomputer IC 12 are mounted). In the present embodiment, the surface of the circuit board 110 on which circuit components including the microcomputer IC 12 are mounted is configured to face the base portion 80. Therefore, when the probe 160 is brought close to the circuit board 110 from the base portion 80 side, the moisture-proof agent 201 is applied to the surface of the circuit board 110, and thus the circuit board 110 cannot be accessed.

  Next, a modification of this embodiment will be described.

  When the probe 160 is brought into contact with the circuit board 110, the positioning of the rewrite terminal portion 150 and the probe 160 is important. If the positioning accuracy between the rewrite terminal unit 150 and the probe 160 is poor, a rewrite error may occur. In order to suppress the occurrence of such rewrite errors, there are the following methods. For example, as shown in FIG. 6, there is a configuration in which connectors c1 and c2 are provided at the tip of the probe 160 and the rewrite terminal portion 150, respectively, and both the connectors c1 and c2 are connected. Further, as shown in FIG. 7, there is a configuration in which the pin terminal c3 is mounted on the rewrite terminal portion and the connector c1 of the probe 160 is connected to the pin terminal c3. As another example, as shown in FIG. 8, there is a configuration in which a conductive portion is provided on the inner peripheral surface of the through hole c4 that penetrates the circuit board 110, and the connector c1 'of the probe 160 is inserted into the through hole c4. As another example, as shown in FIG. 9, a notch c5 for positioning is provided on the circuit board 110, and a positioning convex portion 163 provided on the rectangular portion 162 of the probe 160 is engaged with the notch c5. . The positioning method of the rewrite terminal unit 150 and the probe 160 is not limited to the above-described method, and can be changed as appropriate.

  Further, in order to cool electronic components such as the microcomputer IC 12, a circuit board 115 having a protruding portion 156 protruding outward in the radial direction from the outer peripheral edge of the base portion 80 as shown in FIG. In some cases, each terminal 155 of the rewrite terminal unit 150 may be provided in the protruding portion 156. The protrusion 156 is used to cool various electronic components by sending a part of the air flow flowing in the cylindrical body 3 of the housing 2 to the vicinity of the center of the circuit board 115, and the protrusion 156 has a temperature. Sensors can be implemented. In this configuration, when the data stored in the memory of the microcomputer IC 12 is rewritten, the number of obstacles is further reduced around the rewrite terminal unit 150 compared to the configuration shown in FIG. There is an advantage that a person can work easily.

  The circuit boards 110 and 115 may be printed boards of various materials and configurations, such as rigid boards made of hard materials such as metal, paper phenol, and glass epoxy resin, and flexible boards having flexibility.

  By the way, the axial fan 1 is similar to the blower fan described in Japanese Patent Application Laid-Open No. 2004-120980 in that a rewritable memory is built in the microcomputer IC 12 of the motor control unit. However, the rewriting of the stored data in the axial fan 1 is intended to be performed by stopping the power supply in the stored data of the control program itself stored in advance necessary for control. Therefore, as described above, the stored data can be changed even after the predetermined stored data is written in the memory. As a result, even if it is necessary to change the stored data due to a design change or the like after writing predetermined stored data in the memory, it is necessary to discard the members such as the microcomputer IC 12 and the circuit board 110 or to replace those members. There is a unique effect that data can be changed quickly without any change. On the other hand, the rewriting of the blower fan described in Japanese Patent Application Laid-Open No. 2004-120980 is intended for numerical parameter information for rotation adjustment related to the operating state of the rotating blower fan, and is written by a control program. It is not a ROM that is used to change the contents of RAM (Random Access Memory) that is temporarily stored during operation of the microcomputer. The structure and effect are completely different.

1 is a perspective view of an axial fan according to a first embodiment of the present invention. It is sectional drawing of the axial fan of FIG. It is a top view of the state which removed the impeller assembly 40 of the axial-flow fan of FIG. It is a perspective view which shows a part of probe of the external writing device used for the axial fan of FIG. It is sectional drawing which shows one of the modifications which changed a part of axial fan of FIG. It is sectional drawing which shows one of the modifications which changed a part of axial fan of FIG. It is sectional drawing which shows one of the modifications which changed a part of axial fan of FIG. It is sectional drawing which shows one of the modifications which changed a part of axial fan of FIG. It is an exploded view which shows one of the modifications which changed a part of axial fan of FIG. It is a perspective view which shows one of the modifications which changed a part of axial fan of FIG. It is sectional drawing of the state which removed the impeller assembly 40 of the axial-flow fan of FIG. It is a figure which shows the manufacture flow of the axial fan in this invention. It is a figure which shows the manufacture flow of the axial fan in this invention. It is a perspective view which shows one of the modifications which changed a part of axial fan of FIG. It is a perspective view which shows one of the modifications which changed a part of axial fan of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Axial fan 2 Housing | casing 30,35 Flange 3 Cylindrical body 4 Impeller 5 Motor main body 5a Rotating shaft 6 Motor case 80 Base part 9 Support arm 10 Stator 110, 115 Circuit board 12 Microcomputer IC
13 External connection terminal portion 131, 155, 155 ′ terminal M cable 150 rewrite terminal portion 160 probe 161 terminal c1, c2, c1 ′, c6 connector c3 pin terminal c4 through hole c5 notch 162 rectangular portion 163 positioning convex portion

Claims (10)

An electric motor,
A rotor holder having a substantially cylindrical peripheral wall,
An annular rotor magnet fixed to the inner peripheral surface of the peripheral wall of the rotor holder;
A bearing portion that rotatably holds the rotor holder around a rotation axis;
A bearing housing for supporting the bearing portion;
An armature that is supported by the bearing housing or a base portion thereof and generates torque with the rotor magnet;
A circuit board disposed on the base portion side and electrically connected to the armature,
The circuit board includes a rewritable nonvolatile memory, a rotation control unit that controls rotation at the time of driving based on data stored in the memory, and a driving circuit that supplies a rotation driving current to the motor based on the control of the control unit With
A rewrite terminal for connecting a rewrite control cable connected to an external writing device to the rewritable memory of the circuit board when the motor is stopped is provided on the circuit board, and the rewrite terminal is connected to the circuit A motor arranged to be connectable to a substrate from the armature side.   The motor according to claim 1, wherein the circuit board and the base portion face each other in an axial direction, and a surface of the circuit board on the base portion side is substantially covered with the base portion.   The insulating material is arrange | positioned in the gap | interval of the said circuit board and the said base part, The surface by the side of the said base part of the said circuit board is substantially covered with the said insulating material. The motor described. A blower fan equipped with the motor according to any one of claims 1 to 3,
A hub fixed to the outer surface of the peripheral wall of the rotor holder;
A blower fan comprising: a plurality of blades formed on the hub and generating an air flow by rotating.   The blower fan according to claim 4, wherein the blower fan includes a housing that surrounds the blade from the outside. The circuit board includes a protrusion protruding radially outward from the hub,
The blower fan according to claim 4, wherein the rewrite terminal is provided on the projecting portion. It is a manufacturing method of the ventilation fan in any one of Claims 4 thru | or 6, Comprising:
In the state where the circuit board and the armature are attached to the base portion,
A write terminal connected to an external writing device is electrically contacted from the armature side to a rewrite terminal formed on the circuit board, and a signal output by the external writing device is provided on the circuit board. And a step of writing the stored data in the memory by being transmitted to the memory. It is a manufacturing method of the ventilation fan in any one of Claims 4 thru | or 6, Comprising:
a) electrically connecting the circuit board and the armature;
b) fixing the armature including the circuit board to the base portion;
c) A write terminal connected to an external writing device is brought into electrical contact with the rewrite terminal formed on the circuit board from the armature side, and a signal output by the external writing device is placed on the circuit board. And a step of writing the stored data in the memory by being transmitted to the memory provided. It is a manufacturing method of the ventilation fan in any one of Claims 4 thru | or 6, Comprising:
a) electrically connecting the circuit board and the armature;
b) fixing the armature including the circuit board to the base portion;
c) a step of holding the rotating body including the rotor holder so as to be rotatable about the rotating shaft;
d) inspecting the rotational motion of the rotating body;
e) removing the rotating body of the blower fan found to be abnormal in the inspection;
f) A write terminal connected to an external writing device is electrically contacted from the armature side to a rewrite terminal formed on the circuit board, and a signal output by the external writing device is placed on the circuit board. Writing the stored data in the memory by being transmitted to the memory provided;
The manufacturing method of the ventilation fan characterized by having. It is a manufacturing method of the ventilation fan in any one of Claims 4 thru | or 6, Comprising:
In the blower fan to which the rotating body is rotatably attached,
a) removing the rotating body of the blower fan;
b) A write terminal connected to an external writing device is brought into electrical contact with the rewrite terminal formed on the circuit board from the armature side, and a signal output by the external writing device is placed on the circuit board. Writing the stored data in the memory by being transmitted to the memory provided;
and c) a step of holding the rotating body rotatably about the rotating shaft.

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