JP2013221435A - Ceiling fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceiling fan capable of reducing power consumption and reducing noises by suppressing rotation non-uniformity without using a DC motor or a control circuit with a microcomputer packaged therein.SOLUTION: At an outer peripheral side of a stator 4, a basket-shaped rotor 3 is disposed at a predetermined interval while being held in a freely rotatable manner. At an inner diameter side of the basket-shaped rotor 3, a conductor bar 5 formed from aluminum is provided and outside the conductor bar 5, a permanent magnet 6 is disposed. In a ceiling fan, a motor is packaged where skewing is applied to both the conductor bar 5 and the permanent magnet 6. Therefore, the ceiling fan is operated by fixed rotation at a rotating speed synchronized to a power supply frequency of a commercial AC power source and an induction current generated in the conductor bar 5 can be reduced extremely, and thereby obtaining the ceiling fan capable of reducing power consumption and reducing noises by suppressing rotation non-uniformity.

Description

  The present invention relates to a ceiling fan provided with an electric motor used by being attached to a ceiling of a room.

  In recent years, ceiling fans have come to be used in combination with air conditioning equipment. In the summer, cool air is supplied from the ceiling and used to diffuse cold air that is biased to the floor during cooling. Moreover, it is used so that the warm air which is biased to the ceiling surface may be moved toward the floor surface by reverse operation in winter. By being used in this manner, the function of making the temperature in the room uniform is comfortable and good for health, and the spread of the air-conditioning equipment is becoming more widespread due to the economic effect of energy-saving operation. Therefore, the ceiling fan is an electrical device with a relatively long operating time, and after pursuing downsizing, thinning, and design, high efficiency and low noise by suppressing rotation unevenness are required. .

  Conventionally, this type of ceiling fan has a configuration disclosed in Patent Document 1 and Patent Document 2.

  Hereinafter, the ceiling fan will be described with reference to FIG.

  As shown in the figure, an outer rotation type DC motor 140, a control unit for controlling the DC motor 140, a plurality of rotor blades 150 attached to the outer rotation unit of the DC motor 140, and a motor shaft of the DC motor are connected. The ceiling-hanging joint fitting is provided, and the first printed circuit board 161 and the second printed circuit board 162 constituting the control unit are vertically stacked.

JP 2006-219998 A JP 2008-297939 A

  According to such a conventional ceiling fan, it is necessary to divide and arrange the built-in printed circuit board in order to secure a space for installing a DC power supply, a motor drive circuit, etc., and to pursue design. Reduction in power consumption and suppression of rotation unevenness can be realized without using a DC motor that requires a DC power source or a motor drive circuit. Is required.

  The present invention solves such conventional problems, and provides a ceiling fan that can achieve low power consumption and low noise by suppressing rotation unevenness without using a DC motor. It is aimed.

  And in order to achieve this object, the present invention is a cage-shaped rotation having a stator wound with an armature winding and a conductor bar on the inner peripheral side, located opposite to the outer peripheral side of the stator. The cage rotor is provided with a plurality of rotor blades, and the cage rotor is provided with a permanent magnet on the outer peripheral side of the conductor bar. A ceiling fan that generates and induces an induced current to rotate and accelerate in response to slipping, operates at a constant speed in synchronization with the power supply frequency of a commercial AC power supply during normal operation, and the permanent magnet is skewed This achieves the intended purpose.

  According to the present invention, a stator in which an armature winding is wound, and a squirrel-cage rotor having a conductor bar located on the inner peripheral side, which is opposed to the outer peripheral side of the stator, is rotatably provided. A plurality of rotor blades are attached to the cage rotor, and permanent magnets are arranged on the outer circumference side of the conductor bar on the cage rotor, and an induction current is generated in the conductor bar at the start for slipping. Corresponding rotation, acceleration, and steady operation at a rotational speed synchronized with the power supply frequency of the commercial AC power supply in a steady state, and the permanent magnet is skewed, so that the power supply After charging, the motor accelerates smoothly and quickly shifts to steady operation. During steady operation, it rotates by the magnetic flux of the permanent magnet, so the current flowing through the conductor bar and the current flowing through the armature winding decrease. Efficiency and load change However, since it operates at a constant rotational speed in synchronization with the power frequency of the commercial AC power supply, a ceiling fan can be provided that can achieve low power consumption and low noise by suppressing rotational unevenness without using a DC motor. The effect that can be obtained.

The side view which shows the ceiling fan in Embodiment 1 of this invention Block diagram showing the ceiling fan Exploded perspective view showing the configuration of the same motor Graph showing an example of the rotation speed-torque characteristics of the same motor Side sectional view showing the internal structure of a conventional ceiling fan

  According to a first aspect of the present invention, there is provided a ceiling fan comprising: a stator having an armature winding wound thereon; and a squirrel-cage rotor that is positioned facing the outer peripheral side of the stator and has a conductor bar on the inner peripheral side. The cage rotor is provided with a plurality of rotating blades, and the cage rotor is provided with a permanent magnet on the outer peripheral side of the conductor bar. Rotating and accelerating in response to slipping, generating a constant operation at a rotational speed synchronized with the power supply frequency of a commercial AC power supply in a steady state, and the permanent magnet being skewed Have As a result, after turning on the power, the motor accelerates smoothly and promptly shifts to steady operation. During steady operation, the permanent magnet rotates due to the magnetic flux, so the current flowing through the conductor bar and the current flowing through the armature winding are reduced. Therefore, even if a load change occurs, the operation is performed at a constant rotation speed in synchronization with the power supply frequency of the commercial AC power supply. Therefore, low power consumption and uneven rotation are achieved without using a DC motor. There is an effect that silence can be achieved by suppression.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIGS. 1 to 4, a ceiling fan main body 1 is suspended from a ceiling 14 via a column 15. The main body 1 is provided with a plurality of rotor blades 8, and an electric motor 11 is incorporated therein. doing. A hollow rod-shaped shaft 9 is connected to the support column 15, and a stator 4 around which an armature winding 2 composed of a main winding 2 a and an auxiliary winding 2 b is wound is fixed to the outer periphery of the shaft 9. . On the outer peripheral side of the stator 4, a cage rotor 3 that is rotatably held with a predetermined gap is disposed. A conductor bar 5 made of aluminum is provided on the inner diameter side of the squirrel-cage rotor 3, and a permanent magnet 6 is disposed outside the conductor bar 5. The conductor bar 5 and the permanent magnet 6 are both skewed. ing. The permanent magnet 6 is a bonded magnet in which anisotropic samarium / iron / nitrogen magnetic powder and anisotropic neodymium / iron / boron magnetic powder are mixed, and the particle size of samarium / iron / nitrogen magnetic powder is 2 to 3 μm. -The particle size of iron-boron magnetic powder is 50-100 micrometers, and the base material of a binder is PA12. The capacity of the operating capacitor 10 is set so that operation can be continued at a constant speed at a rotational speed synchronized with the power supply frequency of the commercial AC power supply without stepping out due to load fluctuation when the ceiling fan is actually used. . The starting capacitor 12 is set to have a capacity so as to quickly accelerate at the time of starting after the power supply to the electric motor 11 is turned on, and is disconnected by the PTC thermistor 13 in the synchronous operation state. The electric motor 11 is configured to be covered with the main body cover 17 and the upper cover 16.

  According to such a ceiling fan of the present invention, as shown in the graph of the rotational speed-torque characteristic of FIG. 4, at the time of starting, an induced current is generated in the conductor bar 5 so that a rotational torque corresponding to the slip is generated. Works. Thereafter, the magnet is rotated by the magnetic force of the permanent magnet 6 and the attractive force of the electromagnet by the armature winding 2 of the stator 4, and the operation mode shifts to the high efficiency operation mode in which the induced current generated in the conductor bar 5 is extremely small. In this way, since it is operated at a constant speed at a rotational speed synchronized with the power frequency of the commercial AC power supply, the load change can be achieved without using a DC motor requiring a DC power supply or a control circuit equipped with a microcomputer. Even if this occurs, the power consumption can be reduced, and the constant rotation speed operation can be performed, so that the characteristics that can realize the noise reduction by suppressing the rotation unevenness can be obtained.

  Further, since the conductor bar 5 and the permanent magnet 6 are skewed, the operation as an induction machine such as when the power is turned on smoothly accelerates and the transition to the operation as a synchronous machine becomes smooth. In addition, since the torque ripple during synchronous operation is reduced, a ceiling fan that achieves low vibration and low noise can be obtained.

  Since the permanent magnet 6 is a bonded magnet in which anisotropic samarium / iron / nitrogen magnetic powder having a small magnetic particle diameter and anisotropic neodymium / iron / boron magnetic powder having a large magnetic particle diameter are mixed, the permanent magnet 6 is filled with magnetic powder. Increasing the rate increases the magnetic flux density. Furthermore, since neodymium / iron / boron magnetic powder suppresses the magnetization reversal of samarium / iron / nitrogen magnetic powder, the holding power is improved, and the torque that rotates in synchronization with the power supply frequency is increased. As a result, a ceiling fan with high resistance to load fluctuations can be obtained.

  In the first embodiment, the starting capacitor 12 and the PTC thermistor 13 are provided. However, if there is no effect on the shift from the starting as the induction machine to the synchronous operation, the starting capacitor 12 and the PTC thermistor 13 are connected. Without being provided, only the operation capacitor 10 may be used to perform the start-up and the synchronous operation, and there is no difference in the operation effect.

  As described above, the ceiling fan according to the present invention is small in size and light in weight, simple in outline, easy to install, easy to operate, and low power consumption. It can also be used for public facilities such as hospitals and business facilities such as inns.

1 Main Body 2 Armature Winding 3 Cage Rotor 4 Stator 5 Conductor Bar 6 Permanent Magnet 8 Rotor Blade 9 Shaft 10 Operating Capacitor 11 Electric Motor 12 Start Capacitor 13 PTC Thermistor 14 Ceiling 15 Post 16 Upper Cover 17 Main Body Cover

Claims (2)

A stator in which an armature winding is wound, and a squirrel-cage rotor positioned on the outer peripheral side of the stator and having a conductor bar on the inner peripheral side are rotatably provided. A plurality of rotor blades are attached, and the cage rotor is provided with a permanent magnet on the outer peripheral side of the conductor bar, and at the start, an induced current is generated in the conductor bar to rotate and accelerate in response to slippage. In a normal state, the ceiling fan operates at a constant rotation speed synchronized with the power frequency of a commercial AC power supply, and the permanent magnet is skewed. 2. The ceiling fan according to claim 1, wherein the permanent magnet is a bonded magnet in which anisotropic samarium / iron / nitrogen magnetic powder and anisotropic neodymium / iron / boron magnetic powder are mixed.

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