KR20150073475A

KR20150073475A - Synchronizer using wireless power transfer

Info

Publication number: KR20150073475A
Application number: KR1020130161196A
Authority: KR
Inventors: 조주희; 송성근; 오승열; 신덕식; 이상택; 최정식; 차대석; 박병철; 김수용
Original assignee: 전자부품연구원
Priority date: 2013-12-23
Filing date: 2013-12-23
Publication date: 2015-07-01

Abstract

The present invention provides a synchronizer using a wireless power transmitting device which includes a rotor which includes a rotor core, a coil part which is wound around the rotor core and a rotation shaft which formed on the center of the rotor core, and the wireless power transmitting device which includes a receiving unit which is formed on one end of the rotation shaft and is electrically connected to a field winding of the coil part, a transmitting unit which is separated from the receiving unit and transmits power to the receiving unit, and a power source unit which supplies the power to the transmitting unit.

Description

[0001] SYNCHRONIZER USING WIRELESS POWER TRANSFER WITH WIRELESS POWER TRANSFER DEVICE [0002]

The present invention relates to a synchronous machine using a wireless power transmission device.

Generally, a synchronous machine means a device driven by an external power source and used as a generator or an electric motor.

FIG. 1 is a schematic view of a conventional synchronous machine using a slip ring and a brush, and FIG. 2 is a schematic diagram of a conventional synchronous machine using a separate generator.

1 and 2, a conventional synchronous machine 1 includes a rotor 10 including a coil part 12 wound around a rotator core 11, a rotor 10 inserted into the center of the rotator core 11, (Not shown) provided on the outer side of the rotor 10 and a bearing (not shown) mounted on the rotary shaft 20, though not shown.

1 is a general field winding 12a type synchronous machine 1 in which a power source which flows through the brush 40 when the slip ring 30 and the brush 40 are in close contact with each other is connected to a field winding 12a .

Since the slip ring 30 and the brush 40 are in close contact with each other while the synchronizer 1 starts to be driven or driven, the rotation of the slip ring 30 provided at one end of the rotary shaft 20 causes the brush 40 and the slip ring 30 are inevitably subject to wear and require periodic maintenance. In addition, there is a disadvantage that the synchronizer 1 becomes structurally complicated in order to minimize the occurrence of abrasion of the slip ring 30 and the brush 40.

2 is a synchronous machine 1 of a type which does not use the slip ring 30 and the brush 40, unlike FIG. This type of synchronizer 1 supplies power to the field winding 12a via a separate generator 50 as shown. Therefore, the synchronizer 1 is required to have a separate generator 50 including an expensive permanent magnet, which is relatively expensive and structurally complicated.

In addition, when the synchronous machine 1 is driven by an electric motor, the field power must be generated in the separate generator 50. However, since the field electric power can not be generated unless the synchronous machine 1 rotates, It becomes difficult to drive.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a synchronous machine that is structurally simple, easy to maintain, and capable of driving in a wide speed range from low speed to high speed .

In order to attain the above object, the present invention provides a rotor comprising: a rotor core; a coil portion wound around the rotor core; a rotor including a rotation shaft provided at the center of the rotor core; A synchronous machine using a wireless power transmission apparatus, comprising: a receiver electrically connected to a winding; a wireless power transmission apparatus including a transmitter for transmitting power to the receiver and a power unit for supplying power to the transmitter; to provide.

Preferably, the stator further includes a stator including a magnet portion opposed to the outside of the coil portion, and a yoke portion for fixing the magnet portion, a bearing portion provided on the rotating shaft, and a housing provided outside the stator to form an outer tube .

The sensor unit may further include a sensor unit for sensing a rotational speed of the rotary shaft and a controller electrically connected to the sensor unit and the power unit to control power supplied to the field coil.

Preferably, the wireless power transmission device may be one of an inductive coupling, a resonant magnetic coupling, an RF based wireless power, an optical based (laser based power beaming) Is used.

The present invention can provide a synchronous machine that is structurally simple, easier to maintain, and capable of driving in a wide speed range from low speed to high speed as compared with a conventional synchronous machine using a wireless power transmission device.

1 is a schematic view of a conventional synchronous machine using a slip ring and a brush.
2 is a schematic view of a conventional synchronous machine using a generator.
3 is a schematic diagram of a synchronizer according to an embodiment of the invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Unless defined otherwise, all terms used herein are the same as the generic meanings of the terms understood by those of ordinary skill in the art, and where the terms used herein contradict the general meaning of the term, they shall be as defined herein.

It is to be understood, however, that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

3 is a schematic diagram of a synchronizer 100 according to an embodiment of the present invention.

3, a synchronizer 100 according to an embodiment of the present invention includes a rotor 110, a rotating shaft 120, and a wireless power transmission device 130 and includes a stator, a housing and a bearing .

The rotor 110 includes a rotor core 111 and a coil part 112 wound around the rotor core 111 and includes a rotating shaft 120 provided at the center of the rotor core 111. The rotor core 111 includes a core formed by a spiral method or a lamination method of a plurality of plates and a plurality of teeth formed in a radial direction on an outer circumferential surface of the core, Lt; / RTI >

The rotation shaft 120 is inserted into a through hole formed at the center of the core and rotates, and a receiving part 131 to be described later is provided at one end. In order to smoothly drive the rotation shaft 120, the bearing (not shown) is provided on one side or both sides of the rotation shaft 120.

A magnet portion (not shown) disposed to face the coil portion 112 is provided on the outer side of the coil portion 112 wound on the rotor core 111. The magnet portion includes a housing (not shown) Or a separate yoke portion (not shown) to constitute the stator.

The coil part 112 generates an electromagnetic force by a power source applied to the coil part 112. Due to the interaction between the electromagnetic force and the magnetic force of the magnet part (not shown), the synchronizer 100 rotates the rotor 110 ) Can be rotated to produce rotational force or electric power.

The power applied to the field winding 111a of the coil part 112 wound on the rotor core 111 is applied to the conventional slip ring 30 (see Fig. 1) and the brush 40 Or the wireless power transmission apparatus 130 is used, unlike the synchronizer 1 using the separate generator 50 (see FIG. 2). The wireless power transmission apparatus 130 of the present invention includes a receiving unit 131 provided at one end of the rotating shaft 120 and electrically connected to the field winding 111a of the coil unit 112, And a power supply unit 133 for supplying power to the transmitter 132. The power supply unit 133 is connected to the power supply unit 133,

Unlike the conventional synchronous machine 1 using the slip ring 30 and the brush 40, the present invention using the wireless power transmission device 130 is simple in structure and does not require maintenance due to abrasion.

Here, the wireless power transmission apparatus 130 may be collectively referred to as a non-contact based system in which the power supply unit 133 and the receiving unit 131 are separated from each other and transmit power without a contact in space.

Specifically, the wireless power transmission may be performed by using inductive coupling using electromagnetic induction, resonant magnetic coupling, RF based wireless power, laser based power beaming, Or the like.

The magnetic induction method utilizes the induction phenomenon between the primary and the secondary coils of the transformer, which is advantageous for power transmission between adjacent devices, and is relatively advantageous for large power transmission because of its relatively high power transmission efficiency. The primary and secondary coils are of the same size and coaxial, and are efficient when the ratio of the diameter to the diameter of the coil is less than 0.1. The receiving unit 131 and the transmitting unit 132 in the present invention may be implemented by the primary coil and the secondary coil, respectively.

The self-resonance induction method utilizes the resonance phenomenon between the transmitting and receiving antennas and can simultaneously transmit power to a plurality of electronic devices. Specifically, a kind of energy tunnel is formed by forming an electromagnetic field having a constant frequency at the power source side and placing a receiver resonating at the same frequency in the electromagnetic field. Such a self-resonance induction method is advantageous in that the electric power is transmitted only to the device having the same resonance frequency, so that it is less influenced by other peripheral devices or living bodies. The receiving unit 131 and the transmitting unit 132 in the present invention may be implemented by the antennas.

The electromagnetic wave method radiates electromagnetic waves into the air and directly transmits and receives the electromagnetic waves through the antenna, which is advantageous for long-distance power transmission. The receiving unit 131 and the transmitting unit 132 in the present invention may be implemented by the antennas.

The optical system is a technology for converting light energy into electrical energy and is also applicable to a long distance as a point-to-point system having a directivity.

The sensor unit senses the rotational speed of the rotary shaft 120. The control unit controls the power supplied to the field winding 111a by being electrically connected to the sensor unit and the power supply unit 133. [ (140).

Therefore, the synchronizer 100 according to the embodiment of the present invention can be driven in all frequency ranges, unlike the conventional synchronous machine 1 using the separate generator 50, and the transmitter 132 or the controller 140, Field current control is possible, and high-efficiency driving in a wide speed range of high speed or low speed becomes possible.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined by the appended claims. Range and its equivalent range.

100: synchronizer 110: rotor
111: rotor core 112: coil part
112a: Field winding 120:
130: wireless power transmission device 131:
132: Transmission unit 133:
140:

Claims

A rotor including a rotor core, a coil portion wound around the rotor core, and a rotating shaft provided at the center of the rotor core; And
And a power supply unit for supplying power to the transmission unit, wherein the power supply unit includes a power supply unit for supplying power to the power supply unit, a power supply unit for supplying power to the power supply unit, And a wireless power transmission device.

The method according to claim 1,
A stator including a magnet portion opposed to the outside of the coil portion and a yoke portion for fixing the magnet portion;
A bearing portion provided on the rotary shaft; And
And a housing provided outside the stator to form an outer appearance.

The method according to claim 1,
And a control unit electrically connected to the sensor unit and the power unit to control a power source supplied to the field winding.

The method according to claim 1,
The wireless power transmission apparatus may be a wireless transmission system using any one of an inductive coupling, a resonant magnetic coupling, an RF based wireless power, an optical system (laser based power beaming) A synchronous machine using a power transmission device.