JPH0133839Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a small-sized blower.

Conventional Structure and Problems Conventionally, small blowers have used a square-shaped induction motor as a drive source as shown in FIG. 3. In FIG. 3, 1 is a squirrel-cage rotor, and a stator 2 is provided with a shaded coil 4, and a winding 3 is wound around the stator 2.

On the other hand, there is a small synchronous motor shown in FIG. 4 as a motor that can be used with a commercial power source like the above-mentioned shaded induction motor. In FIG. 4, 5 is a permanent magnet rotor, and a stator 6 is provided with stator windings 7.
This small synchronous motor has advantages over the above-mentioned round-shaped induction motor, such as being simpler in structure and cheaper, producing more torque per motor volume, and being more efficient. It does not have a starting torque and starts when the permanent magnet rotor 5 begins to vibrate when the power is turned on and the vibration increases. Therefore, if the load of the inertial body is directly connected, the mechanical time constant of the rotational motion becomes large. It has the problem that it cannot follow an alternating magnetic field and its starting performance deteriorates.
The degree of deterioration in startability depends on the ratio of the inertia of the permanent magnet rotor 5 itself to the inertia of the load, but in a small synchronous motor with a rating of several watts to several tens of watts, the permanent magnet rotor 5 itself Due to the small inertia of the blower, even if the blades are directly connected to the rotating shaft as a blower, startup performance cannot be ensured. I couldn't use it.

Purpose of the invention The present invention aims to eliminate the shortcomings in starting performance of the above-mentioned small synchronous motor that directly connects the blades, and aims to provide an inexpensive and small blower.

Composition of the invention In order to achieve the above object, the present invention includes a fixing part that is press-fitted onto the rotating shaft of a small synchronous motor;
It includes a strut that connects the outer periphery of the fixed part and the end of the wing section, and a wing section, the strut is made of an elastic material, and the wing section becomes parallel to the rotation axis when the small synchronous motor is stopped. It is constructed in a substantially L-shape.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 8 denotes a small synchronous motor, and a fixing part 9 is press-fitted into the rotating shaft 9 of the motor. The outer periphery of this fixed part 9 and the wing part 1
It is connected to the end of 2 by a support 11. This strut 11 has a substantially L-shape, and the wing portion 12 is attached to the fixed portion 9.
It is supported so as to be parallel to the rotating shaft 9 to which it is attached. Note that the fixing portion 10, the strut 11, and the wing portion 12 are integrally molded from an elastic body such as flexible rubber.

Next, the operation of the above configuration will be explained.

When this small synchronous motor is stopped,
The wing section 12 is supported by the strut 11 so as to be parallel to the rotation axis 9.
The radius of rotation at the center of gravity of No. 2 is small. In other words, since the inertia factor is proportional to the square of the radius of rotation, the inertia load on the rotation axis of the blade section 12 can be small.
This does not interfere with the starting of this small electric motor. After startup, the small synchronous motor generates stable synchronous torque and increases its rotational speed, and as the rotational speed increases, the centrifugal force acting on the wing section 12 also increases, causing the L-shaped elastic strut 11 to The bent portion is extended, and the wing portion 12 rises to the position shown by the broken line 12, allowing air to be blown.

Further, since the elastic support column 11 has an oval cross section, it is difficult to bend in the rotational direction even by the reaction of air.

Conventionally, a self-cooling fan could not be attached to a small synchronous motor because the load would become large and the starting performance would be deteriorated, but with the blower of this example, the load hardly increases, so it is possible to use a small synchronous motor. It is now possible to attach a self-cooling fan to synchronous motors, making them durable for long periods of use.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, an L-shaped support made of an elastic body is provided so that the rotating shaft of the small synchronous motor is parallel to the blade part, so that the small synchronous motor can be compact. The inertia of the blade relative to the rotating shaft when starting the electric motor can be reduced, and as a result, smooth starting can be achieved. In addition, after startup, the elastic struts are stretched and raised by the centrifugal force of the wings, allowing for effective ventilation.

In addition, the above-mentioned effects can be achieved by using an L-shaped support formed of an elastic body, and the connecting portion between the wing portion and the rotating shaft can be easily configured, and mass productivity can be improved.

In addition, small synchronous motors have poor starting performance, so a cooling fan cannot be attached, and the time rating is shortened.However, with the blower of this invention, a self-cooling fan can be attached to the small synchronous motor, so the time rating is also shortened. It is long enough to withstand long-term use.

[Brief explanation of the drawing]

Fig. 1 is a side view of a blower according to an embodiment of the present invention, Fig. 2 is a front view of the blower, Fig. 3 is a block diagram of a shaded induction motor, and Fig. 4 is a block diagram of a small synchronous motor. be. 8...Small synchronous motor, 11...Strut, 12...
...wing section.

Claims (1)

[Scope of utility model registration request] The small synchronous motor is equipped with a fixed part that is press-fitted and attached to the rotating shaft of the small synchronous motor, and a strut and a wing part that connect the outer periphery of the fixed part and the end of the wing part. The blower is configured in a substantially L-shape in which the blade portion is parallel to the rotation axis when the electric motor is stopped.