Regenerative braking and power generation system for trailers

Abstract

The present invention relates to a regenerative braking and power generation system for a trailer that is capable of self-generating the electricity required by the trailer by providing a generator in a brake disc space of the trailer, and includes at least one axle (3) fixed to the trailer chassis (2), a wheel hub (5) and / or a brake disc (6) that is axially mounted on the outer surface of the axle (3) via a plurality of bearings (4) and rotates passively, a space (7) recessed into one side of the brake disc (6), a permanent magnet (8) that is attached and fixed in close contact with the inner surface of the space (7) and rotates together with the brake disc 6, and a generator stator (9) fixed to the outer peripheral surface of the axle (3) corresponding to the permanent magnet (8). The AC power generated by the generator (10) is converted to DC power by a rectifier (20) consisting of a plurality of full-wave diodes (D1, D2, D3, D4, D5, D6) and a smoothing capacitor (C), and then charged into a rechargeable cell (secondary cell) or battery (40) by a charge controller (30), and then supplied to a DC (direct current) load (50). The power of the battery (40) is converted to 50 to 60 Hz AC power by an inverter (60), and then supplied to an AC (alternating current) load 70.

Description

Technical Field

[0001] The present invention relates to a regenerative braking power generation system for a trailer, which is configured to generate electricity required for the trailer by providing a generator in the brake disk space of the trailer.

Background Art

[0002] Generally, a trailer is a vehicle that is connected to a tractor (towing vehicle, towing means) without power and carries goods or people, and is roughly classified into a commercial trailer and a camping trailer. Commercial trailers require a power source (electrical energy) for indoor lighting, tailgates, refrigeration, etc., and camping trailers require a power source to operate household appliances such as indoor and outdoor lighting, TVs, and refrigerators.

[0003] Currently, the power sources used in trailers receive the necessary power from the battery of the tractor (towing vehicle) or produce electrical energy using a diesel generator separately provided in the trailer and use it as a power source.

[0004] On the other hand, when receiving battery power from the tractor side, partial modification of the tractor-side vehicle is required during the process of wiring and installing a separate power supply line. When operating a diesel generator separately provided in the trailer, not only frequent injection, storage, and maintenance of diesel fuel, lubricating oil, etc. are required, but there are various restrictions and limitations on the installation and operation of the diesel generator due to the constraints of the internal space of the trailer, and there are many problems such as the generation of noise and harmful gases while the diesel generator is operating.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

[0006] The problem that this invention aims to solve is to provide a regenerative braking and power generation system for trailers that is configured to generate its own electricity by installing a generator in the brake disc space of the trailer. [Means for solving the problem]

[0007] The regenerative braking and power generation system for trailers according to the present invention includes at least one axle fixed to the chassis of a trailer, a wheel hub and brake disc mounted on the outer surface of the axle via a plurality of bearings and subject to rotational movement, and a generator provided in a recessed space on one side surface of the brake disc, wherein the generator includes a ring-shaped rotor fixed in close contact with the inner circumferential surface of the space in the brake disc and having a plurality of permanent magnets arranged at equal intervals, and a stator fixed to the outer circumferential surface of the axle corresponding to the rotor and composed of stator coils.

[0008] The aforementioned generator may be a permanent magnet synchronous generator (PMSG).

[0009] The stator coil can be routed into the trailer through a through-hole formed in the longitudinal direction of the axle, either inside or outside.

[0010] The AC power produced by the generator is converted to DC power by a rectifier, then charged into a battery by a charge control unit and supplied to a DC load. The power from the battery is converted to AC power by an inverter and then supplied to an AC load.

[0011] The inverter can convert and output three-phase AC power and single-phase AC power simultaneously or selectively. [Effects of the Invention]

[0012] This invention eliminates the problems associated with conventional trailer power supplies by adopting a self-generation system that directly supplies the necessary electrical energy to the trailer by installing a generator in the remaining space provided in the brake disc portion of the trailer.

[0013] The present invention has the effect of converting AC power produced by a generator into DC power by a rectifier, then charging a battery with a charge control unit and supplying it to a DC load, and then converting the power from the battery into AC power by an inverter and supplying it to AC loads individually or selectively.

[0014] This invention is a self-generating power system installed in the remaining space of a trailer, offering not only excellent space utilization but also eliminating the need for separate wiring to receive power from a tractor. Furthermore, because it uses a regenerative braking system, it does not require a diesel generator, thus eliminating the noise and harmful gases generated by the installation and operation of a diesel generator, and significantly reducing maintenance costs. It is a very useful invention. [Brief explanation of the drawing]

[0015] [Figure 1] This is a diagram illustrating the configuration of a regenerative braking power generation system as an example of the present invention. [Figure 2] This is a cross-sectional view showing the state in which a generator is installed in the residual space formed in the brake disc of a trailer according to the present invention. [Figure 3] This is a diagram illustrating the configuration of a permanent magnet synchronous generator (PMSG) as an example of the present invention. [Figure 4] This is a circuit block diagram illustrating one example of the present invention. [Figure 5] This is a circuit diagram of a generator and rectifier section shown as an example of the present invention. [Figure 6] This is a graph showing the power output of a generator, which is presented as an example of the present invention. [Figure 7] This is a graph showing the phase voltage of a generator, which is presented as an example of the present invention. [Figure 8] A graph showing the phase current of the generator shown as an example of the present invention.

Embodiments for Carrying Out the Invention

[0016] Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings. In the description of the embodiments of the present invention, the same components in the drawings are indicated by the same reference numerals as much as possible, and specific descriptions of related known configurations and functions are omitted so that the gist of the present invention is not blurred. Also, the matters shown in the accompanying drawings are diagrams schematized for easily explaining the embodiments of the present invention, and may be different from the actual implemented form.

[0017] The trailer regenerative braking power generation system 1 according to the present invention includes at least one or more axles 3 fixed to the chassis 2 of the trailer, a wheel hub 5 and a brake disk 6 that are axially installed via a plurality of bearings 4 on the outer surface of the axle 3 and are driven to rotate passively, and a regenerative braking power generator 10 provided in a space portion 7 recessed on one side surface of the brake disk 6. The generator 10 includes a ring-shaped rotor in which a plurality of permanent magnets 8 are arranged or arrayed at equal intervals and are fixed in close contact with the inner peripheral surface of the space portion 7 of the brake disk 6, and a stator 9 fixed to the outer peripheral surface of the axle 3 corresponding to the rotor, in which a stator coil 9a is wound around a core 9b. A gap 11 with a predetermined interval is formed between the rotor and the stator so that they are close but do not contact each other.

[0018] By providing a plurality of permanent magnets 8 in a ring shape in the space portion 7 of the brake disk 6, a rotating magnetic field is generated while rotating, and in the stator 9 composed of a core 9b and a stator coil 9a that are fitted and fixed to the outer peripheral surface of the axle 3 corresponding to the plurality of permanent magnets 8, a voltage is generated while the rotating magnetic field is interlinked, thereby generating power by regenerative braking.

[0019] FIG. 2 is a configuration diagram of the trailer regenerative braking power generation system 1 of the present invention, and includes at least one or more axles 3 fixed to the chassis 2 of the trailer, a wheel hub 5 and / or a brake disk 6 rotatably provided via a plurality of bearings 4 on the outer surface of the axle 3, a space 7 recessed on one side surface of the brake disk 6, a permanent magnet 8 closely fixed to the inner peripheral surface of the space 7 and rotating together with the brake disk 6, and a stator 9 of a generator 10 fixed to the outer peripheral surface of the axle 3 corresponding to the permanent magnet 8, or a stator 9 of a generator 10 fixed to the outer peripheral surface of a bracket 12 fixed to the outer peripheral surface of the axle 3 as shown in FIG. 1.

[0020] The permanent magnet 8 corresponds to a rotor that rotates together with the wheel and the brake disk 6, and the stator 9 corresponds to a stator provided on the trailer axle 3.

[0021] The permanent magnet 8 has a ring shape in which a plurality of permanent magnets are arranged at equal intervals, and the stator 9 has three stator coils 9a wound around a core 9b formed by laminating a large number of thin iron plates. Three-phase alternating current is induced in each of these three stator coils 9a by one phase each. The stator coil 9a may be a Y-connection method with a high line-to-line voltage.

[0022] The stator coil 9a may be wired into the trailer through the inside or outside of a through hole formed in the longitudinal direction of the axle 3.

[0023] The generator 10 may be a permanent magnet synchronous generator (Permanent Magnet Synchronous Generator).

[0024] The generator 10 may be a brushless self-excited synchronous generator (Brushless synchronous generator).

[0025] Since the permanent magnet synchronous generator (PMSG) uses permanent magnets, it has an advantage of being about 90% more efficient than a general induction generator method, being capable of miniaturization and weight reduction, and being capable of low-speed operation because there is no gear.

[0026] The air gap 11 between the permanent magnet 8 and the stator 9 is configured to be close to each other but not to rub against each other.

[0027] Figure 4 is a circuit block diagram showing an example of the present invention. The AC power produced by the generator 10 is converted to DC power by a rectifier 20 consisting of multiple full-wave diodes D1, D2, D3, D4, D5, D6 and a smoothing capacitor C. The power is then charged into a rechargeable battery (secondary battery) or battery 40 by a charge control unit 30 and supplied to a DC (direct current) load 50. The power from the battery 40 is converted to AC power of 50-60Hz by an inverter 60 and supplied to an AC (alternating current) load 70.

[0028] The charging control unit 30 includes a constant voltage unit and / or a constant current unit. Of course, the constant voltage unit and constant current unit can be connected between the generator 10 and the charging control unit 30 to stabilize the generated power.

[0029] The inverter 60 can convert and output three-phase AC power and single-phase AC power simultaneously, or selectively convert and output them.

[0030] By providing terminals or outlets on the outputs of the battery 40 and inverter 60, to which two or more loads can be connected, at least two or more AC loads 70 and DC loads 50 can be connected and used.

[0031] As shown in Figure 5, the three-phase AC power output from the three-phase stator coils phA, phB, and phC of the generator 10 of the present invention is rectified by a plurality of full-wave diodes D1, D2, D3, D4, D5, and D6, then smoothed by a capacitor C and converted to DC V+, which is output to drive the DC load LOAD connected to the output.

[0032] The phase voltage, phase current, and output voltage of the generator 10 are determined by the rotational speed (or rotational speed of the magnetic field) and strength of the brake disc 6, and the number of turns of the stator coil 9a.

[0033] Figure 6 is an example graph showing that when the rotational speed of the generator 10, i.e., the rotational speed of the brake disc 6, is 400 rpm, an average power of 1,291 W was obtained. Figure 7 is an example graph showing that a phase voltage of 202 V was obtained in the generator 10. Figure 8 is an example graph showing that a phase current of 2.7 A was obtained in the generator 10.

[0034] In this invention, when a trailer is towed by a tractor (towing vehicle, towing means), the wheels and wheel hubs 5 rotate, the brake discs 6 fixed to the wheel hubs 5 rotate in conjunction, and the permanent magnets 8 provided in the space 7 rotate together, generating a rotating magnetic field. This rotating magnetic field (magnetic flux) is induced in the stator coil 9a, generating a voltage, thereby generating power for regenerative braking. The AC power produced by the generator 10 is converted to DC power by the rectifier 20, then continuously charged in the battery 40 by the charge control unit 30, and then supplied to multiple DC loads 50 of the trailer or supplied to multiple AC loads 70 via the inverter 60 for use.

[0035] In this invention, it is preferable to configure the trailer to generate multiple power by providing a generator 10 in each of the remaining spaces 7 of at least one brake disc 6.

[0036] As described above, the present invention is not limited to this embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible without departing from the technical spirit of the invention, which should be obvious to those with ordinary skill in the art to which the present invention belongs. [Explanation of Symbols]

[0037] 1. Regenerative braking and power generation system 2 chassis 3 axles 4 bearings 5 Wheel Hubs 6 Brake discs 7 Space section 8. Permanent magnet (rotor) 9. Stator 9a Stator Coil 9b core 10 Generators 11 void 12 brackets 20 Rectifier 30 Charging control unit 40 batteries (rechargeable batteries) 50 DC load 60 Inverter 70 AC load

Claims

1. At least one axle fixed to the trailer chassis, A wheel hub and brake disc are mounted on the outer surface of the axle via a plurality of bearings and are subject to rotational movement. The brake disc includes a generator provided in a recessed space on one side of the brake disc, The aforementioned generator is A ring-shaped rotor is fixed in close contact with the inner circumferential surface of the space in the brake disc, and a plurality of permanent magnets are arranged at equal intervals. A stator, which is fixed to the outer surface of the axle corresponding to the rotor and is composed of a three-phase stator coil, Includes, The three-phase AC power produced by the generator is converted to DC power by a rectifier, then charged into a battery by a charge control unit and supplied to a DC load. The power from the battery is converted to 50-60 Hz AC power by an inverter and then supplied to an AC load. The inverter is characterized by simultaneously or selectively converting and outputting three-phase AC power and single-phase AC power, in a regenerative braking power generation system for trailers.

2. The regenerative braking power generation system for trailers according to claim 1, characterized in that the generator is a permanent magnet synchronous generator.

3. The trailer regenerative braking and power generation system according to claim 1 or 2, characterized in that the stator coil is wired through the axle into the interior of the trailer.

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