CN102104311A - Electromagnetic oscillation energy collection device - Google Patents

Abstract

The electromagnetic oscillation energy harvesting device disclosed by the present invention comprises a housing, a mover composed of a magnetically permeable core and a permanent magnet placed in the housing, an insulated cup-shaped stator, a coil winding and a spring, and the permeable core is composed of a concentric The whole formed by connecting the cylindrical inner core and the bottom of the circular outer core has an E-shaped longitudinal section. The permanent magnet is located between the inner core and the outer core of the magnetic core, fixed on the inner surface of the outer core, and the bottom of the magnetic core It is connected with one end of the spring, and the other end of the spring is against the bottom of the housing. The cup-shaped stator is fixed to the inner top surface of the housing, and its circular cup is inserted into the annular air formed by the inner core and the outer core of the permeable core. In the gap, an annular groove is opened on the outer surface of the stator along the circumferential direction, and the coil winding is fixed in the stator annular groove. The device has simple structure and reliable operation, and can convert vibration energy in the environment into usable electric energy.

Description

Electromagnetic Oscillating Energy Harvesting Device

technical field

The invention relates to an electromagnetic vibration energy harvester.

Background technique

An energy harvester is a miniature power generation device that converts the energy in the surrounding environment into usable electrical energy. It is usually used in conjunction with a supercapacitor or a rechargeable battery to store the collected energy, and it can be used when needed. powered by. With the rapid development of low-power integrated circuits, electronic devices consume less and less power. Therefore, conditions are created for the application of micro energy harvesters. Because the service life of the chemical battery is limited, generally 1-2 years, for electronic devices with a long service life, the battery must be replaced during use, and the pollution of the chemical battery is very serious. Therefore, it is of great practical significance to find an alternative method for batteries and choose a method with little pollution, long service life and low cost. There are many types of energy available in the environment, such as solar energy, wind energy, thermal energy, vibration mechanical energy, etc. Among them, vibration energy is everywhere, such as the vibration of bridges and buildings, the vibration of automobile engines, the vibration of people walking, the vibration of production machinery in factories, and even the vibration of entertainment equipment and so on. Vibration energy collection methods can basically be divided into electromagnetic, piezoelectric, electrostatic and magnetoelectric. Among them, the electromagnetic type uses the principle of electromagnetic induction to make the permanent magnet and the coil move relative to each other under the action of external excitation, so as to generate an induced electromotive force in the coil.

The existing vibrating energy harvesters have the disadvantages of large magnetic circuit reluctance, small air gap flux density, non-orthogonal air gap flux direction and coil vibration direction, and large magnetic flux leakage. This limits the improvement of the efficiency of the electromagnetic vibration energy harvester.

Contents of the invention

The object of the present invention is to provide an electromagnetic oscillation energy harvesting device with simple structure, reliable operation and good output power.

The electromagnetic oscillation energy harvesting device of the present invention comprises a housing, a mover composed of a magnetic core and a permanent magnet placed in the housing, an insulated cup-shaped stator, a coil winding and a spring, and the magnetic core is formed by a concentric cylinder The whole formed by connecting the inner core and the bottom of the circular outer core has an E-shaped longitudinal section. The permanent magnet is located between the inner core and the outer core of the magnetic core and is fixed on the inner surface of the outer core. The bottom of the magnetic core is connected to the outer core. One end of the spring is connected, the other end of the spring is against the bottom of the housing, the cup-shaped stator is fixed to the inner top surface of the housing, and its circular cup is inserted into the annular air gap formed by the inner core and the outer core of the permeable core In the stator, an annular groove is opened along the circumferential direction on the outer surface of the stator, and the coil winding is fixed in the stator annular groove.

The above-mentioned permanent magnet can be a single permanent magnet ring, a permanent magnet magnetized along the radial direction. It is also possible to assemble a ring by several tile-shaped permanent magnets, and each tile-shaped permanent magnet is magnetized along the radial direction or in parallel.

In the present invention, the permanent magnet is magnetized NdFeB, S-Co or ferrite. There can be one or more springs.

When working, if the electromagnetic oscillation energy harvesting device is fixed on the vibration source, the housing of the device and the vibration source will vibrate in the same way, the stator and coil windings are directly connected to the housing, and the stator and coil windings are relatively stationary with the vibration source. The mover is connected with the housing through a spring, and relative motion occurs between the mover and the vibration source. The stator and the mover move relative to each other, and the inner core of the mover and the bottom of the outer core are connected as a whole to form a path of magnetic flux. The coil winding cuts the magnetic force line during the relative movement, and at the same time receives the electromagnetic force opposite to the direction of motion. The vibration source acts as a damper. The device can convert the vibration mechanical energy of the vibration source into electric energy.

The beneficial effects brought by the present invention:

The device of the present invention uses the design of the inner core of the iron core and the outer core connected by the bottom, which reduces the magnetic resistance of the magnetic circuit and increases the magnetic density in the air. The permanent magnet adopts the magnetization direction in the radial direction, and the generated magnetic force lines The radial direction is perpendicular to the vibration direction of the coil winding, which increases the output voltage and output electric power. The device has simple structure and reliable operation, and can convert vibration energy in the environment into usable electric energy.

Description of drawings

Fig. 1 is a schematic structural diagram of an electromagnetic oscillation energy harvesting device.

Fig. 2 is a sectional view of A-A in Fig. 1, and the direction of the arrow is the magnetization direction of the permanent magnet.

Detailed ways

With reference to the accompanying drawings, the electromagnetic oscillation energy harvesting device includes a housing 1, a mover composed of a magnetically permeable core 2.1 and a permanent magnet 2.2 placed in the housing, an insulated cup-shaped stator 3, a coil winding 4 and a spring 5, and a permeable magnet The core 2.1 is a whole formed by connecting the concentric cylindrical inner core and the bottom of the circular outer core, and has an E-shaped longitudinal section. The permanent magnet 2.2 is located between the inner core and the outer core of the magnetic permeable core 2.1, and is fixed on the outer core. The inner surface of the inner surface, the bottom of the magnetic conductor core 2.1 is connected with one end of the spring 5, the other end of the spring 5 is against the bottom of the housing, the cup-shaped stator 3 is fixed to the inner top surface of the housing 1, and its circular cup is placed In the annular air gap formed by the inner core and the outer core of the permeable core 2.1, an annular groove is formed on the outer surface of the stator along the circumferential direction, and the coil winding 4 is fixed in the stator annular groove, and the two ends of the coil winding are connected out of the casing by lead wires .

Claims (3)

1. The electromagnetic oscillation energy harvesting device is characterized in that it includes a shell (1), a mover composed of a magnetic core (2.1) and a permanent magnet (2.2) placed in the shell, and an insulated cup-shaped stator (3) , the coil winding (4) and the spring (5), the permeable core (2.1) is a whole formed by connecting the concentric cylindrical inner core and the bottom of the circular outer core, with an E-shaped longitudinal section, and the permanent magnet (2.2) Located between the inner core and the outer core of the permeable core (2.1), fixed on the inner surface of the outer core, the bottom of the permeable core (2.1) is connected to one end of the spring (5), and the other end of the spring (5) is against the At the bottom of the housing, the cup-shaped stator (3) is fixed to the inner top surface of the housing (1), and its circular cup is placed in the annular air gap formed by the inner core and the outer core of the permeable core (2.1), Annular grooves are provided on the outer surface of the stator along the circumferential direction, and the coil winding (4) is fixed in the stator annular grooves. 2. The electromagnetic oscillation energy harvesting device according to claim 1, characterized in that the permanent magnet (2.2) is a single permanent magnet ring, which is magnetized along the radial direction. 3. The electromagnetic oscillating energy collection device according to claim 1, characterized in that the permanent magnet (2.2) is composed of several tile-shaped permanent magnets assembled into a ring, and each tile-shaped permanent magnet is charged along the radial direction or in parallel. magnetic.

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