CN106341030A - Non-contact type permanent magnetic motion energy collection device - Google Patents

Abstract

The invention discloses a non-contact permanent magnet motion energy collection device, which comprises a motion conductor (1), a rotor core (2), a permanent magnet (3), a permanent magnet rotor shaft (4), and a stator three-phase winding ( 5), stator and casing (6), power electronic converter (7); among them, a stator three-phase winding is provided on the inside of the stator and casing, and a rotor core is provided on the other side of the stator three-phase winding , There is a gap between the stator three-phase winding and the rotor core, the two sides of the rotor core are respectively provided with permanent magnets, the rotor core is fixed on the permanent magnet rotor shaft, the permanent magnet rotor shaft is connected to the stator three-phase winding, the stator and the machine The casing is coaxial, the moving conductor is located outside the rotor core, and the power electronic converter is connected with the three-phase winding of the stator. The non-contact motion energy collection device of the present invention can realize a battery-free self-power supply system for low-power remote sensing equipment, has multiple advantages such as simple structure, reliable operation, and good heat dissipation, and conforms to the development concept of energy saving and emission reduction.

Description

A non-contact permanent magnet motion energy harvesting device

technical field

The invention relates to a non-contact electromechanical energy conversion and collection device, in particular to an energy collection device for converting kinetic energy into electric energy composed of a moving conductor, a permanent magnet rotor, a stator and a power electronic converter, belonging to electromagnetic induction and energy Recycling technology field.

Background technique

Against the backdrop of increasingly tense global energy resources and increasing environmental pressure, energy recovery technology can reduce energy consumption and meet the sustainable development concept of energy conservation and emission reduction, and has received more and more attention. For some milliwatt to watt-level equipment (such as LED lighting, remote control sensing equipment, etc.), currently battery power is commonly used, especially wireless sensors, which have formed an infrastructure network and are widely used in automobiles, intelligent buildings, mechanical facility maintenance, Human health monitoring and other fields play an important role in information collection and transmission. However, battery power increases the volume and weight of equipment, requiring frequent maintenance and replacement, and battery production and waste batteries will also cause a lot of waste of resources and environmental pollution. Motion energy recovery technology is one of the effective solutions to meet the demand for low-power power supply. It can be convenient and practical to obtain local materials, directly extract kinetic energy from moving objects around the device and convert it into electrical energy, and realize a self-powered system without batteries.

Contents of the invention

Technical problem: the purpose of the present invention is to propose a non-contact permanent magnet motion energy harvesting device for the shortcomings of current low-power equipment commonly used for battery power supply. This device is a low-power motion energy harvesting device that can convert kinetic energy Converted into electrical energy, powering milliwatt to watt-level power devices.

Technical solution: A non-contact permanent magnet motion energy harvesting device of the present invention includes a motion conductor, a rotor iron core, a permanent magnet, a permanent magnet rotor shaft, a stator three-phase winding, a stator and a casing, and a power electronic converter; , there is a stator three-phase winding on the inside of the stator and the casing, and a rotor core on the other side of the stator three-phase winding. There is a gap between the stator three-phase winding and the rotor core, and the two sides of the rotor core There are permanent magnets respectively, the rotor core is fixed on the permanent magnet rotor shaft, the permanent magnet rotor shaft is coaxial with the stator three-phase winding, the stator and the casing, the moving conductor is located outside the rotor core, the power electronic converter and the stator three-phase winding connection.

The material of the side of the moving conductor opposite to the rotor core is copper or aluminum, which can be realized by pasting copper foil or aluminum foil on the surface, and the moving conductor performs rotational movement or horizontal movement.

The power electronic converter is a rectifier, which converts three-phase alternating current into direct current and connects to the load.

The surface of the rotor equipped with permanent magnets is relatively parallel to the surface of the moving conductor, leaving a gap in the middle without mechanical connection, and the rotational speeds of the two are different.

There are P permanent magnets on both sides of the rotor core respectively, and the magnetic flux directions of the permanent magnets are all along the direction of the rotating shaft of the rotor and perpendicular to the surface of the moving conductor. Evenly distributed, the opposite permanent magnets on both sides have the same polarity, where P is an even number not less than 2.

The permanent magnet is made of NdFeB material with high magnetic energy product, and each permanent magnet is magnetized along the axial direction; the stator and rotor iron cores are made of magnetically permeable steel.

The stator and the stator in the casing have a slotless structure, and the three-phase symmetrical winding adopts a drum-shaped winding structure; the stator is fixed on the casing, and the casing is made of non-magnetic material and supported by bearings.

When the energy harvesting device of the present invention is in operation, the magnetic field of the permanent magnet induces eddy currents on the surface of the moving conductor, and the eddy current magnetic field interacts with the magnetic field of the permanent magnet to generate torque on the rotor disk to make the rotor disk rotate with the shaft, thereby realizing power transmission without mechanical contact ; When the rotor disk rotates, the permanent magnet on the other side generates a magnetic field and interacts with the three-phase winding on the stator to generate alternating current, which is converted into direct current by the power electronic converter to supply power to the load.

Beneficial effects: Compared with the prior art, the non-contact permanent magnet motion energy harvesting device shown in the present invention has the following advantages:

1. The motion energy harvesting device shown in the present invention allows energy to be transmitted between a relatively large air gap length (2-15mm), which is convenient for device placement and installation, and is suitable for relatively harsh working conditions;

2. The axial magnetic flux disk structure is adopted, and the electromagnetic coupling area is large, which can realize more effective energy collection. It has many advantages such as simple structure, reliable operation, and good heat dissipation.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the explosion diagram of stator and rotor of the present invention;

Fig. 3 is a schematic diagram of the arrangement of the rotor permanent magnets of the present invention.

In the figure, there are: moving conductor 1, rotor core 2, permanent magnet 3, permanent magnet rotor shaft 4, stator three-phase winding 5, stator and casing 6, power electronic converter 7.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1, 2 and 3, a non-contact permanent magnet type motion energy harvesting device of the present invention includes a motion conductor 1, a rotor core 2, a permanent magnet 3, a permanent magnet rotor shaft 4, and a stator three-phase winding 5 , stator and casing 6, power electronic converter 7; wherein, a stator three-phase winding 5 is provided on the inside of the stator and casing 6, and a rotor core 2 is arranged on the other side of the stator three-phase winding 5, and the stator There is a gap between the three-phase winding 5 and the rotor core 2, the two sides of the rotor core 2 are respectively provided with permanent magnets 3, the rotor core 2 is fixed on the permanent magnet rotor shaft 4, and the permanent magnet rotor shaft 4 and the stator are three-phase The winding 5, the stator and the casing 6 are coaxial, the moving conductor 1 is located outside the rotor core 2, and the power electronic converter 7 is connected to the three-phase winding 5 of the stator.

The rotor is placed between the moving conductor 1 and the stator and the casing 6 without mechanical contact between the rotor and the moving conductor;

The rotor is composed of permanent magnets 3 surface-attached to both sides of the rotor core 2, which can freely rotate around the rotor shaft 4;

The stator is fixed on the casing, and the stator has three-phase symmetrical windings 5 connected to the power electronic converter 7;

The power electronic converter 7 is a rectifier, which converts three-phase alternating current into direct current and connects to the load.

Preferably, the rotor is placed relatively parallel to the surface of the moving conductor so that the magnetic flux direction of the permanent magnet is along the direction of the rotation axis of the rotor disc and perpendicular to the surface of the moving conductor. The rotor is installed with a rotor shaft and can rotate freely with the shaft. There is no mechanical connection between the rotor and the moving conductor, the speed of the two is different, and the gap between the two is called the air gap length;

As a preference, the rotor core is made of magnetically permeable steel with small reluctance, the permanent magnet is made of NdFeB material with high magnetic energy product, and each permanent magnet is magnetized along the axial direction;

Preferably, the stator has a slotless structure, adopts a drum winding, and the stator core adopts magnetically conductive steel.

Preferably, the stator is fixed on the casing, the casing is made of non-magnetic material and supported by bearings, and the bearings are magneto bearings.

Referring to FIG. 1 , the rotor is placed relatively parallel to the surface of the moving conductor 1 , there is no mechanical connection between the two, and the rotational speeds of the two are different. If the moving conductor 1 rotates around the axis, the rotor and the moving conductor 1 can be concentrically placed or offset to ensure that the surface of the rotor with the permanent magnet 3 and the surface of the moving conductor 1 have sufficient electromagnetic coupling area .

Referring to FIG. 3 , taking P=6 as an example, P permanent magnets 3 are evenly distributed along the circumference of the rotor core 2 in the order of the magnetic poles.

It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. All components that are not specified in this embodiment can be realized by existing technologies.

Claims (7)

1. a kind of non-contact type magneto kinergety collection device it is characterised in that: include motion conduct (1), rotor core (2), permanent magnet (3), p-m rotor rotating shaft (4), three-phase stator winding (5), stator and casing (6), converters (7)；Wherein, the interior survey in stator and casing (6) is provided with three-phase stator winding (5), sets in the opposite side of three-phase stator winding (5) There is rotor core (2), between three-phase stator winding (5) and rotor core (2), leave space, the two sides of rotor core (2) is respectively Be provided with permanent magnet (3), rotor core (2) is fixed in p-m rotor rotating shaft (4), p-m rotor rotating shaft (4) and stator three-phase around Group (5), stator and casing (6) are coaxial, and motion conduct (1) is located at rotor core (2) outward, converters (7) and stator Three-phase windings (5) connect.

2. a kind of non-contact type magneto kinergety collection device according to claim 1 it is characterised in that: described fortune Moving-conductor (1) face material relative with described rotor core (2) is copper or aluminium, can be by sticking Copper Foil or aluminium foil on its surface Realize, motion conduct rotates or horizontal movement.

3. a kind of non-contact type magneto kinergety collection device according to claim 1 it is characterised in that: described electricity Power electronic converter (7) is rectifier, three-phase alternating current is converted into direct current and is connected with load.

4. a kind of non-contact type magneto kinergety collection device according to claim 1 it is characterised in that: described turn The sub surface equipped with permanent magnet and the opposing parallel placement in motion conduct surface, centre leaves gap and mechanical connects, Liang Zhezhuan Speed is different.

5. a kind of non-contact type magneto kinergety collection device according to claim 1 it is characterised in that: described turn Sub- iron core (2) both sides post p permanent magnet (3) respectively, and permanent magnet flow direction is all along the rotor shaft direction of rotor, and leads with motion Body (1) surface is vertical, and the p permanent magnet in every side is pressed the alternate order of magnetic pole and be distributed along rotor core even circumferential, and both sides are relative Permanent magnet polarity is identical, and wherein p is the even number not less than 2.

6. a kind of non-contact type magneto kinergety collection device according to claim 1 it is characterised in that: described forever Magnet selects the NdFeB material of high energy product, and every piece of permanent magnet all magnetizes vertically；Described stator and rotor core are using leading Magnet steel.

7. a kind of non-contact type magneto kinergety collection device according to claim 1 it is characterised in that: described fixed Stator in son and casing (6) is slotless configuration, and three-phase symmetric winding adopts cydariform winding construction；Described stator is fixed on casing On, casing adopts non-magnet material and by bearings.