JP2013252031A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that although an electric motor using a cooling fan whose rotating direction is predetermined has a tablet etc., indicating its correct rotating direction so as to make an alert, it is difficult to visually find reversing when the electric motor is reversed as the indication is missed and so on, and to solve the problem that when an electric motor fitted with a unidirectional rotary fan is reversed, the cooling fan decreases in air capacity to cause a deficiency in cooling and trouble may arise.SOLUTION: An alarm whistle fitted to a cooling fan of an electric motor whistles a warning only during reversing to indicate that the rotating direction is wrong with the sound, thereby preventing the electric motor from being cooled not enough owing to the reversing of the cooling fan.

Description

The present invention relates to an electric motor.

  In general, an electric motor is often capable of bidirectional rotation, and when a cooling fan is attached to the electric motor, it is necessary to obtain an equivalent cooling performance regardless of which direction the motor is rotated. Therefore, a bi-directional rotating fan is generally used as the cooling fan. As such a conventional technique, for example, as in Patent Document 1, there is a technique in which both sides of a blade member of an outer fan fan functioning as a bi-directionally rotating fan are recessed to improve cooling performance. Aside from this conventional technique, as a technique for improving the air blowing performance by a fan, for example, as disclosed in Patent Document 2, a technique mainly using unidirectional rotation like a propeller fan is known.

  In addition, in motor fans for cooling electronic devices or the like for filters such as clean rooms, reverse rotation is performed, for example, as in Patent Documents 3 and 4 in order to prevent a decrease in cooling capacity and filter capacity due to reverse rotation. There is a technology that uses a whistle to inform you that you are. However, in this technology, when the direction of the air generated by the motor fan is completely reversed due to the reverse rotation, the whistle for notifying the above whistle is not the motor body, but the peripheral parts and equipment other than the motor. It is provided in the place where the wind flow is received.

JP 2009-5533 A JP 2007-40202 A Japanese Utility Model Publication No. 62-168708 JP 2004-101067 A

  The cooling fan attached to the electric motor includes a bi-directional rotating fan that can be rotated in either direction and a unidirectional rotating fan whose rotation direction is predetermined. Among these, when the one-way rotating fan rotates in a direction opposite to a predetermined rotating direction, its cooling capacity is lowered and predetermined performance as an electric motor is not exhibited.

  The cooling fan is structurally provided with blades that generate wind by pushing air. For example, the cooling fan 3 shown in FIG. 1 generates a wind flow as indicated by an arrow. As shown in the upper diagram of FIG. 11, the bi-directional rotating fan is arranged with the blades (3d) arranged radially without an angle with respect to the center line, whereas the unidirectional rotating fan of FIG. As shown in the figure below, the blades (3e, 3f) are radially arranged at an angle with respect to the center line.

  Thus, since the blades of the one-way rotating fan are arranged at an angle with respect to the center line, when the fan rotates in the direction opposite to the predetermined rotation direction, the wind direction indicated by the arrow in FIG. Decreasing the amount of air generated as a flow (air amount) causes a decrease in the cooling performance of the electric motor, which becomes a problem.

  In order to understand the correct rotation direction, it is displayed with a nameplate etc. to call attention, but when the motor is operated in the direction opposite to the predetermined rotation direction by missing the display, the rotation speed of the motor is Since it is fast, it is difficult to visually confirm the direction of rotation, and it is difficult to find that it is rotating in the opposite direction.

  An object of the present invention is to notify reverse rotation in order to prevent reverse rotation at the time of installation or maintenance of an electric motor to which a one-way rotation fan is attached.

  In order to solve the above-described problems, the present invention is provided with a horn for notifying a sound when an electric motor to which a one-way fan is attached rotates in a direction opposite to a predetermined rotation direction. Further, when the electric motor rotates in a predetermined direction, a movable valve is provided to prevent the horn from sounding. Further, when the horn is attached to the one-way rotating fan, the horn attachment guide is provided at the attachment position of the horn so that the horn is not attached in the wrong direction.

  With the above configuration, when the one-way rotating fan is rotated in a direction opposite to a predetermined rotation direction, it is possible to generate and notify a sound with the horn.

  According to the present invention, when an electric motor to which a one-way rotating fan is attached is rotated in a direction opposite to a predetermined rotating direction, the reverse rotation is notified by generating a sound with a horn provided on the electric motor. It becomes possible to do.

The figure explaining the whole electric motor of a present Example The figure explaining the cooling fan attached to the electric motor of a present Example The figure explaining the comparative example which should avoid the installation position of the horn The figure explaining the Example of the attachment position of a horn The figure explaining the Example of the shape of a horn The figure explaining the Example of the shape of a horn attachment guide The figure explaining the Example of a horn attachment The figure explaining the Example of a movable valve (a) The state figure which the movable valve closed (b) The state figure which the movable valve opened The figure explaining the Example of a movable valve at the time of rotating to a predetermined direction The figure explaining the Example of a movable valve at the time of rotating in the direction opposite to a predetermined direction Comparison of bi-directional rotating fan and unidirectional rotating fan

  FIG. 1 is a diagram illustrating the entire electric motor according to the present embodiment. The electric motor of this embodiment includes a stator 1 that receives power supply, a rotor 2 that rotates by a rotating magnetic field from the stator 1, a cooling fan 3 that is coaxial with the rotor 2, a housing 4 of the electric motor, and housing cooling fins. 5, a bracket 6, a shaft 7, a bearing 8, and a fan cover 9 for the cooling fan 3, which are rotated by a rotary shaft 10.

The cooling fan 3 shown in FIG. 2 rotates about the rotation shaft 10 and has a fan boss 3a, a fan base 3b, and blades 3c.
The fan base 3b in the cooling fan 3 is provided with a horn 11 (FIG. 2) and a horn mounting guide 12 (FIG. 6).

  1stly, about the attachment position of the horn 11, if the horn 11a is attached between the blade | wing 3d and the blade | wing 3e like FIG. 3, the flow of the wind which the cooling fan 3 will generate | occur | produce will be inhibited. Therefore, as shown in FIG. 4, the wind flow can be prevented from being hindered by being attached to the fan base 3 b on the back side of the blade 3 c.

  Further, by setting the vicinity of the outer ring of the fan base 3b as shown in the horns 11f, 11g, and 11h in FIG. 4 instead of the vicinity of the fan boss 3a as in the horns 11d and 11e in FIG. More can be captured.

  2ndly, about the attachment quantity of the horn 11, it can be made to function reliably as a horn by attaching two or more like FIG.3 and FIG.4.

  In addition, since it is mounted on the rotating body, the mounting intervals are not different as in the case of the horns 11a, 11b, and 11c in FIG. By attaching them at regular intervals, the weight of the cooling fan can be balanced.

  3rdly, about the shape of the whistle 11, when rotating in the predetermined rotation direction, the air resistance of the whistle 11 can be reduced by attaching a taper like the whistle 11i of FIG. 5, for example.

  Further, as the shape of the horn 11 in relation to the attachment of the horn 11, for example, the horn 11 and the horn attachment guide 12a in FIG. The shape is narrower than the reverse rotation direction. By adopting such a shape, it is possible to prevent the attachment direction of the horn 11 from being wrong. That is, as shown in FIG. 7, the horn 11 is attached only in a predetermined direction. And if the direction which attaches the horn 11 is a shape regulated by a specific direction, it will not be caught by the said shape. As shown in FIGS. 7 to 10, the horn 11 is attached to a predetermined position by a horn attachment screw 15.

  Further, as the shape of the horn 11, for example, an arrow indicating the direction of rotation is displayed on the upper surface of the horn 11 as indicated by an arrow 14 in FIG. It can be easy to understand.

  Fourth, regarding the components of the horn 11, the movable valve 13 provided in the horn 11i of FIG. 5 is like the movable valve 13b of FIG. 8A due to the flow of air generated by the rotation of the cooling fan 3. Are changed into a closed state and an open state like the movable valve 13c in FIG. 8B. As a result, when the cooling fan 3 rotates in a predetermined rotation direction, the movable valve 13b is closed as shown in FIG. 9, thereby preventing air (N) from entering the inside of the horn 11 and generating no sound. Intrusion of dust or the like into the horn 11 can be prevented. When the cooling fan 3 rotates in the direction opposite to the predetermined rotation direction, the movable valve 13c generates an opening sound by the air (P) that has passed through the inside of the alarm 11 as shown in FIG.

  Thus, since the movable valve 13 has a structure that receives air when it rotates in a predetermined rotation direction, for example, the movable valve 13a shown in the L portion enlarged view of FIG. 8B is used. By providing a bulge and providing an angle M as described above, it is possible to make the structure easy to receive wind.

  According to the said Example, when the rotation direction of the electric motor with which the one way rotation fan was attached rotated in the reverse direction to the predetermined rotation direction, a sound can be generated and notified. In addition, the structure of the movable valve 13 described above can prevent dust and the like from entering the inside of the alarm whistle 11, so that the function can be performed even when there is a lot of dust.

  This embodiment only needs to function at the time of installation or maintenance of the electric motor. Even during maintenance, the structure of the movable valve 13 prevents dust from entering the inside of the horn 11 so that the horn 11 can be operated normally. Can function. Moreover, if the horn 11 is cleaned at the same time as the installation or maintenance of the electric motor, the function can be performed more reliably.

  As described above, the whistle shown in the above embodiment is an example for explanation and is not limited to this. If the device has its function, it can be changed appropriately at the time of actual design and commercialization. May be added.

  In the present invention, when the rotation direction of the electric motor to which the one-way rotation fan is attached rotates in the direction opposite to the predetermined rotation direction, a sound can be generated and notified. It can be used during installation or maintenance. Also, since it functions without being affected by some dust, it is effective even in such an environment.

1: Stator 2: Rotor 3: Cooling fan 3a: Fan boss 3b: Fan base 3c-3g: Blade 4: Housing 5: Housing cooling fin 6: Bracket 7: Shaft 8: Bearing 9: Fan cover 10: Rotating shaft 11: horn 11a-11i: horn 12: horn installation guide 12a: horn installation guide 13: movable valve 13a-13c: movable valve 14: rotation direction arrow 15: horn installation screw

Claims (5)

A stator that receives a power supply to generate a rotating magnetic field;
A rotor rotating by a rotating magnetic field from the stator;
A cooling fan that is coaxial with the rotor and includes a one-way rotating fan whose rotation direction is predetermined;
An electric motor comprising: a horn attached to the cooling fan and generating a sound when rotated in a direction opposite to the predetermined rotation direction. The electric motor according to claim 1,
A plurality of the horns are attached in the circumferential direction of the cooling fan, and are arranged at equal intervals in the circumferential direction. The electric motor according to claim 1 or 2,
The cooling fan includes a fan boss and a plurality of blades provided on one surface of the fan boss,
The electric horn is mounted on a fan base on the back side of the plurality of blades. The electric motor according to any one of claims 1, 2, and 3,
The horn has a movable valve, and the movable valve is closed when the cooling fan rotates in the predetermined direction and does not generate a sound, and is opened when the cooling fan rotates in a direction opposite to the predetermined direction. An electric motor characterized by generating sound. The electric motor according to any one of claims 1, 2, 3, and 4,
An electric motor comprising a horn mounting guide that allows the horn to be mounted only in one direction at a position where the horn is mounted.

Images