CN102104312A - Cylindrical double-layer winding linear permanent magnet synchronous generator - Google Patents

Abstract

The invention discloses a cylindrical double-layer winding linear permanent magnet synchronous generator. The outer cylinder is provided with a plurality of ring-shaped permanent magnets and is separated from each other by a first set of magnetic spacer rings and the inner hole is wound with a plurality of outer layer windings with the same number as the ring-shaped permanent magnets and is separated by a second set of spacer rings. The outer core in which the magnetic rings are separated from each other. There is a central hole in the center of the shaft, and it is installed in the central hole. The outer cylinder is provided with an inner winding separated by a third set of magnetic isolation rings. A spring is installed between the inner side of the inner core and the bottom surface of the shaft with the central hole. End caps are installed on the end faces of the layer iron core and the outer layer iron core; there are annular air gaps of the same height between the outer layer winding, the permanent magnet and the inner layer winding respectively. The invention adopts a cogging-free moving magnet double stator structure, which has the characteristics of rapid response and high utilization rate of permanent magnets while eliminating positioning force. It converts linear motion into power output without intermediate conversion device, and can be used in piston and wave power generation, etc., which is energy-saving and environmentally friendly.

Description

Cylindrical double-layer winding linear permanent magnet synchronous generator

technical field

The invention relates to a linear permanent magnet synchronous generator, in particular to a cylindrical double-layer winding linear permanent magnet synchronous generator.

Background technique

With people's attention to energy and environment, linear generators that can directly use the mechanical vibration of objects to generate electricity have gradually become a research hotspot at home and abroad. Different from traditional rotary generators, linear generators can directly convert linear motion in production and life into electrical energy, which not only reduces energy loss, but also expands the scope of application. Vibration is everywhere, such as the movement of pistons and the shaking of vehicles. In the utilization of ocean tides and wave energy, linear generators can directly generate alternating current through the up and down motion of the secondary. The simple and efficient direct energy conversion method promotes Development and application of linear generators.

At present, traditional cylindrical linear generators generally adopt moving magnet structure in China. The primary is composed of iron core and winding. Composed of permanent magnets, the ring-shaped permanent magnets are magnetized radially or axially, fixed on the outside of the secondary core, and connected to external drive equipment through bearings. This makes the linear generator have the following main problems during operation:

1. The cogging effect of the motor will generate positioning force, which affects the stability of the motor operation;

2. The existence of the iron core increases the weight of the secondary and reduces the response speed of the motor;

3. High iron consumption limits the improvement of motor efficiency and permanent magnet utilization.

Contents of the invention

In order to solve the problems existing in the operation of the cylindrical linear permanent magnet generator in the background technology, improve the efficiency and response speed of the motor, and eliminate the influence of the positioning force on the smoothness and stability of the motor operation, the purpose of the present invention is to provide a circular Cylindrical double-layer winding linear permanent magnet synchronous generator.

The present invention solves technical problem, and the adopted technical solution is:

The invention includes that the outer cylinder is provided with a plurality of annular permanent magnets and is separated from each other by a first group of magnetic spacer rings and the inner hole is wound with the same number of outer layer windings as the number of annular permanent magnets and is separated from each other. The outer core separated by the second set of magnetic isolation rings, the shaft is coaxially installed in the hole of the outer core; it is characterized in that: a central hole is opened in the center of the shaft, and a central hole is opened from the center of the shaft One end of the axis of the inner layer iron core is installed in the center hole, and the outer cylinder of the inner layer iron core is provided with an inner layer winding with the same number as the circular permanent magnet and separated by a third set of magnetic isolation rings. A spring is installed between the side surface and the bottom surface of the shaft with a central hole, and an end cover is installed on the outer surface of the inner layer iron core and one end surface of the outer layer iron core; there are annular air gaps of the same height between the outer layer winding, the permanent magnet and the inner layer winding.

The outer winding includes three circular windings, which are connected in series with each other, wherein the windings at both ends have the same winding direction, and the intermediate windings have opposite winding directions; the inner winding includes three circular windings, which are connected in series, and the inner The winding direction at both ends of the layer winding is the same as the winding at both ends of the outer layer winding, and the winding direction of the middle winding is opposite; the outer layer winding and the inner layer winding are connected in series.

The three annular permanent magnets are respectively radially magnetized rare earth permanent magnet NdFeB magnets, and the magnetization directions of adjacent annular permanent magnets are opposite, and a In the magnetic isolation ring, the magnetic field forms a loop through the inner core and the outer core, and is distributed sinusoidally along the axial direction in the air gap.

The slot pitch of the outer layer winding and the slot pitch of the inner layer winding are equal to the pole pitch of the permanent magnet.

When the shaft of this linear generator is driven reciprocatingly, the outer winding and the inner winding will cut the magnetic field at the same time, generating an induced electromotive force. When the size of the motor is fixed, the magnitude of the induced electromotive force is proportional to the movement frequency of the shaft, and the higher the movement frequency , the greater the induced electromotive force, when the external circuit of the winding is closed, the linear generator can supply power to the outside. In order to protect the motor shaft and permanent magnet, a spring is placed between the linear generator shaft and the inner iron core, which can eliminate the external impact force and limit the secondary movement stroke.

The beneficial effects that the present invention has are:

1. Directly convert linear motion into electrical energy output, avoiding the loss of intermediate conversion equipment and improving the overall power generation efficiency;

2. The cogging-free structure eliminates the positioning force, improves the power quality, and improves the stability of the motor operation;

3. There is no iron core in the secondary, which reduces the secondary quality and improves the motor response speed;

4. The double-layer winding structure improves the utilization rate of permanent magnets.

Description of drawings

Accompanying drawing is the sectional view of linear generator of the present invention.

In the figure: 1-1. Outer core, 1-2. Inner core, 2-1. Outer winding, 2-2. Inner winding, 3. Permanent magnet, 4. End cover, 5. Magnetic isolation ring , 6. Shaft, 7. Spring, 8. Column.

Detailed ways

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

As shown in the accompanying drawings, the present invention includes a shaft 6 with a plurality of annular permanent magnets 3 arranged on an outer cylinder and an outer core 1-1 with an outer winding 2-1 around the inner hole. The circular permanent magnets 3 are separated by the first group of magnetic spacer rings 5 . The number of the outer layer winding 2-1 is the same as that of the 3 annular permanent magnets, and they are separated from each other by the second group of magnetic spacer rings 5 . The shaft 6 is coaxially installed in the hole of the outer core 1-1. There is a center hole in the center of the shaft 6, and the inner layer iron core 1-2 is installed from one end of the shaft 6 with the center hole into the center hole, and the inner layer winding 2 is wound on the outer cylinder of the inner layer iron core 1-2. -2. The number of the inner layer winding 2-2 is the same as that of the 3 annular permanent magnets, and they are separated from each other by the third group of magnetic spacer rings 5 . Both sides of the magnetic isolation ring 5 are provided with grooves, which can play a role in fixing the outer layer winding 2-1 and the inner layer winding 2-2. The spring 7 is installed between the inner surface of the inner core 1-2 and the bottom surface of the shaft 6 with a central hole, which can relieve the external impact force and limit the secondary stroke. When the frequency of the external driving equipment is constant, the motor efficiency can also be improved through resonance. Effect. The outer surface of the inner layer iron core 1-2 and the end face of the outer layer iron core 1-1 are equipped with an end cover 4, and the end cover 4 is required to have a certain strength, so as to ensure a good connection between the outer layer iron core 1-1 and the inner layer iron core 1-2. Concentricity. One end of the shaft 6 is fixed by a pillar 8 to ensure the coaxiality of the shaft 6 with the outer layer iron core 1-1 and the inner layer iron core 1-2, so that the permanent magnet 3 and the outer layer winding 2-1 and the inner layer winding 2-2 maintain the same air gap height.

The outer layer winding 2-1 and the inner layer winding 2-2 are formed by winding enamelled copper wires. The outer layer winding 2-1 includes three annular windings A1, B, A2, which are connected in series, wherein the windings A1, A2 at both ends have the same winding direction, and the middle winding B has the opposite direction; the inner layer winding 2-2 includes Three ring-shaped windings a1, b, a2 are connected in series, wherein the windings a1, a2 at both ends of the inner winding are in the same direction as the windings a1, a2 at the two ends of the outer winding, and the winding direction of the middle winding b is opposite; the outer winding and The inner windings are connected in series with each other.

The three annular permanent magnets 3 are radially magnetized rare earth permanent magnet neodymium-iron-boron magnets, the magnetization directions of adjacent annular permanent magnets are opposite, and two adjacent annular permanent magnets are placed between There is a magnetic isolation ring, and the magnetic field forms a loop through the inner layer iron core 1-1 and the outer layer iron core 1-2, and is distributed sinusoidally along the space.

The slot pitch of the outer layer winding and the slot pitch of the inner layer winding are equal to the pole pitch of the permanent magnet. The primary iron core is made of ordinary silicon steel sheet or A3 steel, and the manufacturing process is the same as that of the traditional linear motor.

The invention can utilize linear power such as pistons or sea waves to generate electricity. When in use, the generator outer core 1-1 and the pillar 8 need to be fixed on the equipment, and the installation direction is determined by the direction of the external driving force to ensure that the permanent magnet 3 can reciprocate in the axial direction. When the generator is running, the shaft 6 is externally connected to the external drive device or the axial displacement occurs with the movement of the equipment, and the permanent magnet 3 will move with the outer winding 2-1 and the inner winding 2-2, and the outer winding 2 -1 and the inner layer winding 2-2 simultaneously cut the lines of magnetic force to generate induced electromotive force, and when an external load is connected, external power supply can be realized. Compared with the traditional single-layer winding structure, the present invention can provide higher induced electromotive force while ensuring the sensitivity of the motor under the condition of the same volume of the permanent magnet, thereby improving the utilization rate of the permanent magnet.

Claims (4)

1. A cylindrical double-layer winding linear permanent magnet synchronous generator, comprising a plurality of annular permanent magnets on the outer cylinder and the shaft separated by the first group of magnetic isolation rings and the inner hole are surrounded by An outer layer iron core with the same number of outer layer windings of circular permanent magnets and separated by a second group of magnetic isolation rings, the shaft is coaxially installed in the outer layer iron core hole; it is characterized in that: There is a center hole in the center of the shaft, and an inner layer iron core (1-2) is installed from one end of the shaft (6) with the center hole to the center hole, and the outer cylinder of the inner layer iron core (1-2) is provided with The inner layer winding with the same number as the ring-shaped permanent magnet and separated by the third set of magnetic isolation rings, a spring (7 ), the outer surface of the inner layer core (1-2) and the end face of the outer layer iron core (1-1) are equipped with an end cover (4); there are annular air gaps of the same height between the outer layer winding, the permanent magnet and the inner layer winding . 2. a kind of cylindrical double-layer winding linear permanent magnet synchronous generator according to claim 1, is characterized in that: described outer layer winding comprises three annular windings (A1, B, A2), are connected in series with each other, wherein the windings (A1, A2) at both ends are wound in the same direction, and the middle winding (B) is wound in the opposite direction; the inner layer winding includes three circular windings (a1, b, a2), which are connected in series with each other, wherein The windings (a1, a2) at both ends of the inner layer winding are in the same direction as the windings (A1, A2) at both ends of the outer layer winding, and the middle winding (b) is in the opposite direction; the outer layer winding and the inner layer winding are connected in series. 3. A cylindrical double-layer winding linear permanent magnet synchronous generator according to claim 1, wherein the three annular permanent magnets are respectively radially magnetized rare earth permanent magnets NdFeB, the magnetization directions of adjacent circular permanent magnets are opposite, and a magnetic isolation ring is placed between two adjacent circular permanent magnets, and the magnetic field passes through the inner core (1-1) and the outer core (1- 2) Form a loop and distribute sinusoidally along the axial direction in the air gap. 4 . A cylindrical double-layer winding linear permanent magnet synchronous generator according to claim 1 , wherein the slot pitch of the outer layer winding and the slot pitch of the inner layer winding are equal to the pole pitch of the permanent magnet.

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