JP2013017369A - Coupled type outer rotor motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the following problem in a specially designed motor: Motor efficiency is good because of the best specifications suited to each application, but many types must be developed for each application and hence production amount for each type becomes small and a mass production effect is not expected, resulting in difficult cost reduction.SOLUTION: Each of a stator and a rotor of a motor is divided into three portions in the axial direction and the length of its central portion is changed. Otherwise, by replacing the parts with parts with different lengths, a motor with a plurality of specifications and outputs can be achieved without causing a cost increase.

Description

The present invention relates to an outer rotor motor, which is a motor mainly used in vehicles, transportation equipment, industrial machines, and household electrical appliances, and a rotor rotates on the outer periphery of a fixed stator.

In recent years, outer rotor motors are becoming the mainstay in-wheel motors for electric vehicles, but they have not yet gone through the research stage, and motors that are individually designed are used individually.

Dedicated designed motors have optimal specifications for each application, so the efficiency of the motor is good, but many types must be developed for each application. As a result, each type Production volume is reduced, mass production effect cannot be expected, and cost cannot be reduced.
The spread is delayed because the cost is not lowered, and if the spread is delayed, the cost will rise further.

The motor's stator and rotor are each divided into three parts in the axial direction, and the motors with multiple specifications and outputs can be provided without increasing costs by changing the length of the central part or replacing parts with different lengths. to enable.
Specifically, it is configured as described in any one of claims 1 to 10.

Conventionally, for example, when five types of output / specification motors are required, five types of rotors and stators must be developed. However, according to the present invention, one kind of motor divided into three parts is developed, and only four kinds of stators and rotors in the central portion are added.
As a result, development costs can be greatly reduced, and the total cost can be greatly reduced without taking up space for logistics and inventory storage. That is, an optimum configuration can be obtained for mass production and commercial specifications.

In an outer rotor motor, a fixed stator and a rotating rotor are each divided into three parts in the axial direction, and then used by being connected. By replacing the central part of the stator and the rotor with parts having different lengths, the output of the motor, the braking force during regenerative braking, or the power generation capacity when used as a generator can be changed.
In addition, the stator wiring is connected in parallel by connecting the connecting portions directly and connecting to the coil from the middle of the wiring.

Embodiments of the invention are as detailed in claims 1-10. An example is shown below.

FIG. 1 shows an outer rotor motor of the present invention. A spline 7 is provided at the end of the rotating shaft, that is, the driven shaft 6, and is engaged with the spline of the rotor 8. The rotor 8 is fixed to the rotating shaft 6 by a washer 11 and a bolt 12. Since FIG. 1 is symmetric with respect to the axis 1, the lower half is omitted.
The rotor 8 is an end portion of the rotor divided into three parts, and is combined with the central portion 9 and the fixing portion 10 and rotates integrally. The stator 3 is attached to a device 2 that uses a motor, such as a vehicle, a machine tool, or a home appliance, and is used in combination with each of the stators in the central portion 4 and the end portion 5.
Here, if the rotor 9 and the stator 4 are replaced with parts having different lengths in the axial direction, it is possible to obtain a motor with different output and specifications at a much lower cost than when the entire motor is newly made. The rotating shaft 6 may be attached to the fixed portion 2 and the spline fitting portion 7 may be a bearing.
In this case, the rotor rotates on a fixed shaft, which can be used for an in-wheel motor of an electric vehicle. The above is the embodiment of the present invention described in claims 1 to 3.

FIG. 2 is a schematic diagram showing wiring in the stator of the outer rotor motor of the present invention. Reference numeral 19 denotes a wiring of the stator central portion 4. A male connector 13 for connecting to the end portion of the stator, a connector 14 for connecting to the fixed portion of the stator, and a coil 15 are connected as shown in 19. ing. Similarly, in the wiring of the stator fixing portion 3, the male connector 16, the female connector 17 and the coil 18 are connected as shown in FIG. The internal connection of the end portion 5 of the stator is the same as that of the central portion 4, but the male connector 13 is eliminated because it is the end.
With this configuration, when the stators 3, 4, and 5 are connected, the current flowing through the coils is connected in parallel, and the voltage can be kept constant. Moreover, even if the size of the stator 4 at the center changes or when a plurality of the stators at the center are connected, the voltage can be kept constant as well, and if the male and female connectors are mistaken, they cannot be connected at all. This will prevent misassembly.
Although FIG. 2 is a schematic diagram, the actual connector has a shape that does not protrude from the connection surface of the stator. The above is the embodiment of the present invention described in claims 4 to 6.

FIG. 3 shows the configuration of the rotor fitting portion of the outer rotor motor of the present invention. Since it is symmetric with respect to the axis 1 as in FIG. 1, the lower half is omitted.
The rotor end portion 21, the center portion 22, and the fixing portion 23 are configured to rotate on the same axis with tapered surfaces 25 and 24, respectively. In this state, a bolt (not shown) is passed through the through hole 27 and tightened with a female screw 26. A plurality of bolts are arranged so as to be rotationally symmetric with respect to the axis 1. With this configuration, the combined rotors can rotate with good balance on the same axis.
Although not shown, if the spline 7 is changed to a bearing and a gear or belt pulley shape is provided on the outer peripheral surface of the central portion 22 of the rotor, the rotational force can be extracted from the outer periphery of the rotor. . Furthermore, if a wheel is directly installed on the outer periphery of the rotor, it can be used as a replaceable in-wheel motor.
If a part of each rotor is used as a centrifugal pump, the motor can be air-cooled. The above is the embodiment of the present invention described in claims 7 to 10.

According to the present invention, even when there are a plurality of uses, required outputs, and output characteristics, it is not necessary to prepare several types of the whole motor, and only a plurality of types are prepared with only the central rotor and stator, and the production efficiency is greatly improved. Increase and the amount of inventory can be reduced.
Further, even when a plurality of central stators are connected, since the power supply to the coil is always connected in parallel, the convenience is high and no erroneous assembly occurs.

It is sectional drawing of this invention goods, Since it is object with respect to an axial center, the lower part is abbreviate | omitted. FIG. 3 is a diagram schematically illustrating a wiring of a stator according to the present invention. It is sectional drawing of only the rotor part of this invention goods, and the lower part is abbreviate | omitted like FIG.

1, shaft center 2, fixed part (in the vehicle, body frame, etc.)
3. Stator fixed portion 4. Stator central portion 5. Stator end portion 6. Rotating shaft (driven shaft, output shaft)
7, spline fitting portion 8, rotor end portion 9, rotor center portion 10, rotor fixing portion 11, rotor fixing washer 12, rotor fixing bolt 13, stator central portion male connector 14 A female connector 15 at the center of the stator, a coil 16 at the center of the stator, a male connector 17 at the stator fixing portion, a female connector 18 at the stator fixing portion, a coil at the stator fixing portion. 19. Stator center wiring 20, Stator fixing section wiring 21, taper-fitting rotor end section 22, taper-fitting rotor center section 23, taper-fitting rotor fixing section 24 , Taper fitting part (the fixed part and the central part of the rotor)
25, taper fitting (center and end of rotor)
26, female thread (for bolt fitting)
27, through hole 28, recess (for embedding bolt heads)

Claims (10)

A configuration in which the rotor is spline-fitted, press-fitted, taper-fitted, screwed, or a combination of them to extract the power by rotating the driven shaft, or on a fixed shaft via a bearing. In the outer rotor motor configured such that the rotor rotates and the driving force is extracted from the axial end surface or outer peripheral surface of the rotor, the axial length of the stator and the rotor is configured to be extendable and retractable. Rotor motor. The rotor and stator are divided into three parts, the fixed part, the central part, and the terminal part, in the axial direction, and the central part is replaced with parts with different axial lengths, thereby changing the axial length of the entire motor. The connected outer rotor motor according to claim 1, wherein the outer rotor motor is configured to be possible. The stator fixing portion refers to a portion provided with an attachment member for attaching the motor body to the pedestal or the vehicle body of the apparatus, and the end portion of the stator refers to a portion on the opposite side. In addition, the end of the rotor refers to a portion provided with a connecting device for attaching a rotating object or transmitting power to the rotating object, and fixing the stator on the opposite side of the fixing part of the rotor. The part that rotates outside the part. The rotor and stator are divided into three parts, the fixed part, the central part, and the terminal part, in the axial direction, and the central part can change the axial length of the entire motor by connecting multiple rotors and stators. The connected outer rotor motor according to claim 1, wherein the outer rotor motor is configured. The stator fixing portion refers to a portion provided with an attachment member for attaching the motor body to the pedestal or the vehicle body of the apparatus, and the end portion of the stator refers to a portion on the opposite side. In addition, the end of the rotor refers to a portion provided with a connecting device for attaching a rotating object or transmitting power to the rotating object, and fixing the stator on the opposite side of the fixing part of the rotor. The part that rotates outside the part. A power connector for energization is provided on each connection surface of the fixed part, center part, and end part of the stator. This connector is characterized in that only the electrical contacts are exposed from the connection surface and the connector body is embedded in the connection surface. The connection type outer rotor motor according to claim 2 and 3. The connected outer rotor motor according to any one of claims 2 to 4, wherein the power supply wiring to each stator is connected in parallel with the following configuration. When the motor body is used as a regenerative brake or a generator, the power supply wiring is read as power recovery wiring.
1, the wiring of the stator fixed part is directly connected to the wiring connector that is attached to the device or the vehicle body and receives power supply, and the power connector for connection to the center part of the stator. It was set up to supply power after branching off.
2. The wiring at the center of the stator is connected directly to the power connector on the fixed part and the power connector on the end, and the coil is fed to the central part from the direct connection. did. The power connector at the center of the stator has a shape in which only the combination of the fixed portion side and the end portion side can be physically connected, and the fixed portion side and the fixed portion side cannot be connected on the end portion side and the end portion side. The connected outer rotor motor according to claim 4, wherein the outer rotor motor is configured as described above. The connected outer rotor motor according to claim 1, wherein the rotor has any one of the following configurations.
1, each connection part of a fixed part, a center part, and a terminal part was made into a spigot fitting by a taper surface, and was tightened and fixed in the axial direction with a bolt that passed through each part in the axial direction. Fastening was performed by providing a female screw at the end and tightening it from the end with a bolt penetrating the center and end.
The number of bolts is plural, and the arrangement is rotationally symmetric with respect to the rotation axis.
2. The fixed part, the central part, and the terminal part are connected to each other with a taper screw. In addition, after tightening the screw, including a configuration in which a setscrew, rivet, or pin is press-fitted from the outer surface toward the center of the rotation axis to prevent loosening, there are a plurality of setscrews, rivets, and pins. Is rotationally symmetric with respect to the rotation axis, or balances the rotor as one.
3. The connecting portions of the fixed portion, the central portion, and the end portion were shrink-fitted or shrink-fitted by taper fitting, or a ring-shaped metal ring was shrink-fitted on the outer periphery of the rotor. A pulley for gear or belt drive is press-fitted, integrally molded, integrally processed, screwed, or taper-fitted to the outer periphery of the fixed part, center part, or end part of the rotor, and driven from the outer periphery. The connected outer rotor motor according to any one of claims 1 to 7, characterized in that a force can be taken out. The wheel according to any one of claims 1 to 7, characterized in that a wheel of a wheel is attached to, or integrally formed with, or press-fitted, riveted, or screwed to an outer periphery of a rotor at a central part or a terminal part. Connected outer rotor motor described in 1. In addition, the structure which attaches a wheel using the through-hole opened in the flange and the bolt attached to the flange is provided including the flange on the outer periphery of the rotor. 10. The structure according to claim 1, wherein a sealing seal is attached to the stator or a fixed portion to which the stator is attached, and the lip portion is brought into contact with the inner peripheral surface or the end surface of the rotor, so that dust and water can be removed from the rotor. An articulated outer rotor motor characterized in that it is installed so that it does not enter the inside, that is, dust and water do not touch the stator, and has one of the following configurations.
1, a through hole was provided in the vicinity of the stator mounting portion, and the space inside the rotor was communicated with the outside air.
Note that the configuration for communicating with the outside air includes a configuration in which a pipe is attached to the through hole and the open end of the pipe is provided above or below the rotation shaft, and a valve is provided at a portion communicating with the outside air.
2.A through hole is provided in the vicinity of the stator mounting part to communicate the space inside the rotor with the outside air, and a valve that is opened by centrifugal force is provided on the outer periphery of the rotor. It comprised so that it might discharge.
Note that the configuration for communicating with the outside air includes a configuration in which a pipe is attached to the through hole and the open end of the pipe is provided above or below the rotation shaft, and a valve is provided at a portion communicating with the outside air. Moreover, the structure which attached the centrifugal pump which attached the valve to the rotor, and the structure which used only the rotor of the terminal part, the center part, and the fixing | fixed part as a centrifugal pump are also included.

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