JPS62288389A - Fan integrally formed with motor - Google Patents

Abstract

PURPOSE:To simplify structure by forming a cross flow fan motor with plural direct-flow brushless motors and dispersedly providing said motors in a fan rotor. CONSTITUTION:Plural direct-flow brushless motors 4 are provided in a fan rotor 2 being dispersed on a shaft 3 including two places close to both end plates 5. The motor 4 close to the end plate 5 is formed into a face opposed gap motor with its rotor 7 and stator 8 being coaxially installed with the end plate 5 and the shaft 3, respectively. The rest of the motors 4 are formed into radially opposed gap motors. Thereby, it is not necessary to provide attached equipment on both sides of a fan rotor, making a fan compact while simplifying structure.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a motor-shaped fan in which multiple rows of drive motors are incorporated in a fan rotor of a cross-flow fan.

(Prior Art) A motor-shaped fan in which a fan rotor of a cross-flow fan and a DC brushless motor are coaxially assembled has a known structure as disclosed in Japanese Utility Model Application Publication No. 60-41594. A flat ring-shaped rotor magnet is attached to the side plate of the crossflow fan via a magnetic member for forming a magnetic path, and the stator coil wound in a flat plate is attached to a fixing member such as a housing so as to face the magnet. Place it in It has a configuration in which a fan rotor and a face-to-face DC brushless motor are integrated with a short shaft length.

(Problems to be Solved by the Invention) The conventional motors described above are somewhat satisfactory in terms of making the fan more compact, but if the axial length of the fan becomes long and a large rotational force is required, DC motors may be used. Since the brushless motor is of a surface-facing type, sufficient rotational force cannot be obtained unless the diameters of the rotor magnet and stator coil are increased.1 Therefore, there is a problem in that the diameter of the fan rotor increases accordingly.

Also. This is because the fan rotor is supported and driven by only one end of the shaft. A fan rotor with a long shaft has some disadvantages, such as the need to use a thick and mechanically strong fan rotor shaft to prevent rotational deviation or deflection of the shaft.

In view of the fact that the conventional motors have many problems that need to be solved in practical terms, the present invention has been made, and in particular, the present invention is aimed at using a DC brushless motor as a fan in a cross-flow fan. By creating a unique configuration in which the members are distributed in multiple rows within the rotor. The support shaft of the fan rotor can be made as short and lightweight as necessary, and sufficient rotational force can be secured while the rotor diameter is small, thereby making the motor body of the fan more compact. The main purpose of the invention is to achieve weight reduction and ease of assembly.

(Means for Solving the Problems) Therefore, in order to achieve the above-mentioned object, the present invention includes end plates (5) on both sides and a plurality of blades (6) extending between the both end plates (5). ), a housing (1) surrounding the fan rotor (2), and a housing (1) surrounding the fan rotor (2), and both end plates (5) that are rotatably inserted through bearings by loosely penetrating the respective centers of the end plates (5). ), and a shaft (3) fixed to the housing (1), and fan rotors (2) at two or more locations distributed around the shaft (3), including two locations close to the end plates (5). A motor-shaped fan is constituted by a plurality of DC brushless motors (4) respectively disposed within the DC brushless motors (4), and the plurality of DC brushless motors (4) are located at at least one of two locations close to both end plates (5). The motor (4) is
A rotor (7) whose element is a permanent magnet (10) is connected to an end plate (5).
), a stator (8) having a winding (b) as an element is attached to the shaft (
3), and the remaining motors (
4) has a rotor (7) whose element is a permanent magnet (10) concentrically inscribed in a plurality of blades (6) of a fan rotor (2), and whose element is a winding (b). A radially opposed gap motor is formed in which a stator (8) is fixed concentrically to the shaft (3), and a motor (4) is provided adjacent to one end plate (5). Stator (8)
A magnetic pole detection element (9) is arranged only in the magnetic pole detection element (9), and the detection signal of this magnetic pole detection element (9) causes direct current to be applied simultaneously and in the same direction to the windings (2) that are in the same phase of each motor (4). It is characterized by being made to flow.

The present invention also includes: The shaft (31) that rotatably supports the fan rotor (2) is formed into a hollow shaft, and the hollow part is connected to the windings (31) in the stator (8) of each DC brushless motor (4).
2) A preferred embodiment is a structure that can be used as a passage for guiding electric wires connected to 2).

(Function) Since the plurality of DC brushless motors (4) are all housed within the fan rotor (2), the fan axial length can be shortened to the maximum.

The shaft (3) is a fixed shaft, and the fan rotor (
Since the structure supports the intermediate portion of (2), the shaft (3) and the fan rotor (2) can rotate smoothly without wobbling, and the shaft (3) can also be small in diameter and lightweight.

Furthermore, by forming a single system in which the electronic circuit for rotation control is shared by each DC brushless motor (4),
Synchronous rotation control can be performed easily and reliably.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

In FIG. 1, (1) is a cross-flow fan housing, which has an axially elongated intake port and an air supply port (not shown) and has an axially elongated cylindrical fan inside. It has a rotatable built-in rotor (2).

The fan rotor (2) has end plates (5) on both sides and a plurality of sheets arranged between the two end plates (5) and arranged to have a predetermined pinch surrounded by two concentric virtual cylinders. It consists of a blade (6) and is made of a hard synthetic resin molded product to reduce weight.

In addition, each blade (6) is in the form of a long and thin plate, so in order to prevent distortion, a ring as a reinforcing rib is installed at the location where the axial direction is divided into multiple equal parts (in the illustrated example, at the location where it is divided into eight equal parts). In the illustrated example, two of the partitions αD are provided.
The structure is such that a rotor-side member of a DC brushless motor (4), which will be described later, is attached as a partition that also serves as reinforcement.

As shown in Figures 2 and 3, both end plates (5) of the fan rotor (2) have a stepped hole in the center and a bearing (l [9) is inserted into the hole on the larger diameter side. It's forcing me.

(3) is a hollow shaft, and the both end plates (5)
The end plate (5) is loosely inserted into the stepped hole of the housing (5) to rotatably support it through the bearing αe, and both ends are connected to the housing (5).
1) is fixed to the opposite side plates.

In the cross-flow fan having such a structure, the axially long fan rotor (2) rotates around the shaft (3), so that the air sucked in from the intake port is sent out in a wide air layer from the air supply port. Although it is possible. Juan Rota (
2), a plurality of DC brushless motors (hereinafter abbreviated as motors) C4) are arranged in association with the fan rotor (2) and the shaft (3), respectively.

The motor (4) is installed in the fan rotor (2) at two or more locations, including two locations close to the end plates (5), or at three or more locations where the shaft (3) is divided into multiple sections. Each rotor (force is attached to the fan rotor (2) side) and each stator (8) is attached to the shaft (3) side.

These motors (4) are installed at two locations near both end plates (5), and one or both of them, in this example, the right side, is provided with a face-to-face gap motor (4), and the other The one is a radial opposed gap motor (4)
The structures of the two types of motors are as described below.

The radial opposed gap motor (4) is shown in FIGS. 2 and 4, and the rotor (7) has a ring-shaped yoke Ql that is inscribed and fitted into each blade (6) of the fan rotor (2). ) and a permanent magnet Ql closely attached along the inner periphery of the yoke αD, while the stator (8) consists of an iron core α and a winding (b).

The permanent magnet α has two N-pole pieces (1O
N) and S pole piece (101") with the direction of the magnetic pole facing the central axis and the rotation angle with respect to the central axis being 900, N
Pole pieces (10M) and S pole pieces (10S) are arranged adjacent to each other alternately and attached to the yoke aυ in a cylindrical shape. When the fan rotor (2) is made of synthetic resin, it is convenient to integrate them by simultaneous molding, and an iron pipe is suitable for the coke αD since it forms a magnetic path.

On the other hand, the stator (8) has six windings (2) attached to each coil winding part on an iron core a1 in which the coil winding parts protrude radially from the central boss part with a rotation angle of 60'. It is wrapped around the boss and is fitted and fixed onto the shaft (3) through a shaft hole provided at the center of the boss.

The motor (4) thus configured has a stator (8) fitted perpendicularly to the shaft (3), and a ring-shaped rotor (2) arranged concentrically around the stator (8). Therefore, a highly efficient motor (4) can be obtained by making the gap between the rotor (η and the stator (8) as small as possible).

Next, the face-to-face gap motor (4) is shown in FIGS. 3, 5, and 6, and the rotor (7) is attached to a ring-shaped iron plate aa that serves as a magnetic path. The rotor (7) is attached concentrically to the inner surface of the end plate (5).

On the other hand, the stator (81) includes a disc-shaped iron plate that is fitted and fixed to the shaft (3) and a winding (2
), and the permanent magnet αω is shown in Figure 6 (a).

As shown in (υ), each two N-pole pieces (1
0,4) The S pole piece (IQs) has a magnetic pole direction parallel to the axis (3) and faces toward the center of the axis (3), and the rotation angle with respect to the central axis is 906, and the N pole piece (ION), S Pole piece (10,
) are arranged alternately and adjacent to each other with a small gap between them! and attach it to the iron plate Q41 in the form of a disk.

Next, the winding wire (2) is shown in FIG. 5, and the six wires wound in a fan-shaped frame shape are pasted on the disc-shaped iron plate to form the shaft (3).
The windings are arranged at equal intervals around the rotation angle of 60@ so that the winding axis of each winding coincides with the direction of the magnetic pole of the permanent magnet α.

(In the configured motor (4), the stator (8) is the axis (3)
By being fitted perpendicularly to the end plate (5), it faces in parallel and close to the end plate (5), and thus faces the rotor (7) attached to the end plate (5) with a slight gap. and,
Each type of permanent magnet α (10□) and (10g) has a small gap so that no rotational force is generated, and by reducing the magnetic flux leaking to the adjacent pole, it is efficient and generates a large rotational force. configured to obtain.

Of the motors (4) described above, the right side surface facing gap motor (4) or the left side radial facing gap motor (4) provided close to the end plate (5) is shown in Fig. 5 or 4. As shown in the figure, magnetic pole detection elements (9) are attached to predetermined locations on the stator (8).

This magnetic pole detection element (9) requires the number of magnetic pole units consisting of a pair of an N pole piece and an S pole piece in the stator (8), that is, three in this example, and is, for example, a Hall element. The position of this Hall element (9) is shifted by an angle (θ) to the left from the center of the winding (2), and this shift angle is 15 degrees as shown in FIG.
°The no-load current is small for both clockwise and counterclockwise rotations,
Therefore, turn right.

This angle means that the motor has the highest efficiency when used for both left-handed rotations.

The motor (4) provided with this Hall element (9) is one of a plurality of motors, and the stator (8) of the motor (4) in which no other Hall element is present is equipped with the Hall element (9). ) of the motor having the same phase with respect to the motor rotation direction, and the rotor (7) of all the motors (4). ) are arranged so that the number of magnetic pole units is equal and they are in the same phase with respect to the rotation direction.

For each motor (4) arranged in this way, the electric wires connected to the windings (2) of each stator (8) are connected to the shaft (3) using the hollow part of the shaft (3). The motors (4) are driven simultaneously by pulling them out at one end and connecting the stator windings in parallel to a common control circuit for each motor (4) as shown in FIG. Can be done.

In this case, direct current is caused to flow simultaneously and in the same direction through the windings (2) of each motor (4) that are in phase.

In addition, the circuit shown in FIG. 7 has only one driving IC, which occupies most of the circuit, and there is also clockwise rotation.

Switch (S) for switching left rotation, motor (4)
It has a transistor (1, (uz)) serving as a switching regulator for switching the speed of the motor, a variable resistor (VR) for speed adjustment, and a rectifier circuit α for direct current rectification.

This control circuit changes the pulse width of the PWM circuit (pulse width modulation circuit) built into the IC by simply operating the variable resistor (VR), so the voltage supplied to the motor (4) can be freely changed. The same effect can be easily obtained.

(Effects of the Invention) As explained above, the present invention provides a motor for driving a cross flow fan using a plurality of DC brushless motors (four DC brushless motors).
), and each motor (4) is connected to a fan rotor (2
), it is possible to omit accessory devices such as motors on both sides of the fan rotor (2), and by using the motor (41), which has a short axial length, There are fewer obstructions to the flow of air, making it possible to downsize the fan, especially its axial length, and when applied to air conditioners, it blows air out from almost the entire width of the machine. Moreover, the device can be made more compact.

Moreover, each of the plurality of motors (4) is connected to a fan rotor (2).
Since the fan rotor (2) is synchronously driven while being supported, the fan rotor (2) does not bend or shake, and the shaft (3) can be made thin and lightweight.

Furthermore, by forming the motor at one or both ends of the fan rotor (2) into a face-to-face gap type motor (4), the air flow occupied by the motor is blocked compared to when a radial-to-face gap type is used. The volume can be reduced to improve air blowing efficiency, and the attachment of the magnetic pole detection element (9) has the advantage of simplifying the structure.

[Brief explanation of drawings]

Each figure shows an embodiment of the present invention, and FIG. 1 is a schematic front view, FIG. 2 is an enlarged front view of main parts, FIG. 3 is a structural diagram of one end side of the fan rotor, and FIG. 4 is a radial opposing view. Figure 5 (A) is a cross-sectional structural diagram of the gap motor, and Figure 5 (A) is a cross-sectional structural diagram of the stator of the surface facing gap motor.
Figure 6 (a) is a cross-sectional structural diagram of the rotor of the face-to-face gap motor, Figure 6 (rl)
6 is a sectional view taken along the line B-B in FIG. 6(a), FIG. 7 is an electric control circuit diagram, and FIG. 8 is a characteristic diagram of the fan motor. αυ...Housing, (2)...Fan rotor, (3)...Shaft, (4)...
...DC brushless motor, (5) ... end plate,
(6)...Blade, (7)...Rotor, (8)...Stator, (9)...Magnetic pole detection element, α[ ...Permanent magnet, scream...
...Winding wire. Fig. 1 Fig. 3 Fig. 4 Fig. 5 (a) (b) 8' U "in" Fig. 6 (a) (b) Fig. 8

Claims (2)

[Claims] 1. a fan rotor (2) having end plates (5) on both sides and a plurality of blades (6) spanning between the both end plates (5);
A housing (1) that surrounds the fan rotor (2) and the center portions of the both end plates (5) are loosely inserted to rotatably support the both end plates (5) via bearings, and the housing (1) A plurality of DC brushless motors (DC brushless motors) each disposed within a fixed shaft (3) and fan rotors (2) at two or more locations distributed around the shaft (3) including two locations close to the both end plates (5). 4), in which the plurality of DC brushless motors (4) are arranged so that at least one of the two motors (4) adjacent to both end plates (5) is connected to a permanent magnet (10).
The end plate (5) is equipped with a rotor (7) having a winding (12
) are fixed concentrically to the shaft (3), and the rest of the motor (4) in other parts has permanent magnets (10 ) is a fan rotor (
2), which are concentrically inscribed in a plurality of blades (6), and each stator (8) having a winding (12) as an element is concentrically fixed to the shaft (3), respectively. The magnetic pole detection element (9) is disposed only on the stator (8) of the motor (4), which is formed in the opposed gap motor, and which is provided close to one end plate (5). Windings (12) that are in phase with each motor (4) according to the detection signal of the detection element (9)
A motor-integrated fan characterized in that a direct current is caused to flow simultaneously and in the same direction. 2. The shaft (3) that rotatably supports the fan rotor (2) is connected to the stator (8) of each DC brushless motor (4).
2. A motor-shaped fan according to claim 1, wherein the motor-shaped fan is formed in a hollow shaft having a passage for guiding an electric wire connected to the winding (12) in the coil (12).