JPS6325891Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-pole outrotor fan that has a thin structure, is simple and easy to manufacture.

Currently, there is a large demand for small and thin fans for radiator cooling, radio equipment, other electronic equipment, and various pollution gas analysis equipment.

Traditionally, AC fans were the mainstream for fixed types, and the size
The reliability is sufficient, but since the blades are rotated by a normal motor for portable DC power supplies, it is not necessarily sufficient.In particular, the out-rotor type has a slip ring and a brush outside the brush. Electronic brushless models are expensive because they require extra wires, the windings are complicated and winding and wiring are extremely complicated and difficult, the windings protrude to the sides and are difficult to make thin, and rectification is required to feed power to the stator. In addition to the two brushes, two extra sliding rings and two extra brushes are required, and the external winding type has disadvantages such as being difficult to balance since it cannot be wound automatically. There is.

The present invention solves the conventional drawbacks, and its configuration is such that a fixed iron core 3 is fixed to the outer periphery of a bearing 2 provided at the center of a frame 1, and a magnetic pole piece is attached to the fixed iron core 3.
1 and 11', and the two ends a and b of a bifilar winding 5 provided on the outer periphery of the fixed iron core 3 are provided as magnetic pole pieces 11 and 11'.
A four-pole magnetized permanent magnet 7 is provided on the inner periphery of an outrotor 6 having several blades 14 on its outer periphery. The brush 10 and the rotating shaft 9 are fixed, the out rotor 6 is fitted on the outside of the magnetic pole pieces 11, 11', the rotating shaft 9 is rotatably inserted into the bearing 2, and the rotating shaft 9 is connected to a power source. The bifilar winding 5 is provided with a lead wire C for connecting to a power source, which is brought into contact with the piece 12. It is a four-pole outlaw fan.

To explain this invention in more detail, there is a bearing 2 in the center.
A magnetic pole piece 1 having a commutator 13 connected to both ends a and b of a fixed core 3 surrounding the fixed core 3 and a bifilar winding 5 coaxially wound is provided at both ends of the fixed core 3.
1, 11' and supported by a bearing 2.
is provided with a permanent magnet 7 magnetized to four poles on its outer periphery and an outrotor 6 having blades 14 on its outer periphery,
The outrotor 6 is provided with a polarity switching brush 10 for switching the commutator 13, and one end drawn out through the bearing 2 and a lead wire C drawn out from the midpoint of the bifilar winding 5 are connected to a power source. A bobbin 4 is fitted around a fixed iron core 3 fitted to a bearing 2 attached to the center of the frame 1, and a bifilar winding 5 is attached to the bobbin 4 with a lead wire C extending from the midpoint.
The lead wire C drawn out from the midpoint is used as one pole for power supply. Both ends a and b of the bifilar winding 5 are connected to a commutator 13, and these four commutators 13 are arranged concentrically with the bearing 2, and U-shaped magnetic pole pieces 11 are provided above and below the fixed iron core 3. 11' is provided through an insulator (not shown) of the magnetic pole piece 11.
A conductive rotary shaft 9 supported by a bearing 2 passes through the magnetic pole pieces 11 and 11', and has a permanent magnet 7 magnetized to four poles on the inner periphery and a permanent magnet 7 wound around the outer periphery of the permanent magnet 7 at the upper end. It has a magnetic spacer 8 and a blade 14 on the outer periphery.
An out rotor 6 is provided. A switching brush 10 for switching the polarity of the commutator 13 is provided near the joint between the outrotor 6 and the shaft 9. Further, one end drawn out through a connecting piece 12 and a lead wire C drawn out from a tap at the midpoint of the bifilar winding 5 are connected to the lower end of the rotating shaft 9 as a pole for feeding power from a power source.

In addition to the above embodiments, the rotating shaft 9 and the connecting piece 12
If the connection between the rotary shaft 9 for applying voltage and the connecting piece 12 becomes defective due to dirt from oil or the like, a slip ring may be provided separately.

Furthermore, the polarity switching is not limited to the above-mentioned sliding contact, and may be switched by other means. For example, a reed switch may be installed and the attractive force of a small magnet attached to the outrotor may be used. shall be taken as a thing.

By configuring the present invention as described above, when a current is supplied with the connecting piece 12 and the leader wire C at both ends, the connecting piece 12 - the rotating shaft 9 - the switching brush 10 - the commutator 13 - one end a of the bifilar winding 5 - A magnetic generation circuit is formed with the lead wire C of the bifilar winding 5, and magnetism is generated in the fixed iron core 3, and the U-shaped magnetic pole pieces 11, 1 are provided at both ends of the fixed iron core 3.
1', magnetic poles are generated alternately with NSNS at the tips of the magnetic pole pieces 11, 11', and the outrotor starts rotating due to repulsion and attraction with the permanent magnet 7 attached to the outrotor 6.

Next, the outrotor 6 rotates, and the polarity of the magnetic pole pieces 11, 11' is switched at a position where the permanent magnet 7 and the magnetized magnetic pole pieces 11, 11' are at the same position or close to each other. In other words, by switching the switching brush 10, the current is supplied to the magnetic circuit consisting of the connecting piece 12, the rotating shaft 9, the switching brush 10, the commutator 13, one end b of the bi-airer winding 5, and the lead wire C of the bi-airr winding 5. As a result, the direction of the current applied to the bifilar winding 5 is reversed, and the magnetic field is reversed. Therefore, the power is supplied to one end of the bifilar winding 5 in a switched manner, and the polarity of the magnetic pole pieces 11, 11' is switched at a position corresponding to the polarity of the magnet, so that the motor maintains rotation.

Therefore, according to the present invention, since the winding structure is simple, it is possible to wind a large number of windings at the same time, and the work can be done efficiently, and even thin wires can be wound without strain. , have a large number of windings,
It can be made thin without the winding protruding outside.

Also, it can be manufactured without using a slip ring. Even if a slip ring is used, it only requires one piece.
Leads to work efficiency and cost reduction.

Furthermore, the outrotor itself can be manufactured and processed independently, making it extremely easy to balance it, and when using the outrotor fan, the driving force of the outrotor fan acts in the tangential direction on the rotating shaft, making the driving force more effective. However, since it does not create a torsional force, the bearing can be set compactly in the center. Therefore, the outlaw fan of the present invention has excellent effects such as being thin and simple in structure, and being able to be supplied in large quantities at low cost.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a sectional view of the invention, FIG. 2 is a bottom view of the same, and FIG. 3 is an exploded perspective view of the same. 1 is a frame, 2 is a bearing, 3 is a fixed iron core, 4 is a bobbin, 5 is a bifilar winding, 6 is an outrotor, 7 is a permanent magnet, 8 is a spacer, 9 is a rotating shaft, 10 is a switching brush, 11, 11 ' is the magnetic pole piece, 1
2 is a connecting piece, 13 is a commutator, and 14 is a blade.

Claims (1)

[Scope of utility model registration request] A fixed iron core is fixed to the outer periphery of a bearing provided in the center of the frame, and a magnetic pole piece is provided on the fixed iron core, and
Both ends of the bifilar winding provided on the outer periphery of the fixed core are connected to a commutator consisting of 4 pieces provided on the magnetic pole piece, and a permanent magnet magnetized into 4 poles is placed on the inner periphery of the out rotor, which has several blades on the outer periphery. A switching brush that contacts the commutator and a rotating shaft are fixed to the center of the outrotor, the outrotor is fitted onto the outside of the magnetic pole piece, and the rotating shaft is rotatably mounted on a bearing. A four-pole out rotor fan characterized in that the rotating shaft is brought into contact with a power supply connection piece, and a lead wire for power supply connection is provided on the bifilar winding.