Regenerative braking power generation system for a trailer

Abstract

The present invention relates to a regenerative braking power generation system for a trailer, in which a power generator is provided in a brake disc space portion of the trailer to generate power required for the trailer, comprising: at least one or more axles (3) fixed to a chassis of the trailer; a hub (5) and / or a brake disc (6) axially provided outside the axle (3) by a plurality of bearings (4) and passively rotated; a space portion (7) concavely formed in one side of the brake disc (6); a permanent magnet (8) closely adhered to and fixed to an inner circumferential surface of the space portion (7) and rotated with the brake disc (6); and a power generator stator (9) fixed to an outer circumferential surface of the axle (3) corresponding to the permanent magnet (8). The alternating current generated by the power generator (10) can be converted into direct current by a rectification portion (20) composed of a plurality of full-wave diodes (D1) (D2) (D3) (D4) (D5) (D6) and a smoothing capacitor (C), and then supplied to a DC (direct current) load (50) after being charged to a battery (secondary cell) or a battery (40) by a charge control portion (30), and the power source of the battery (40) can be converted into 50-60 Hz alternating current by an inverter (60) and then supplied to an AC (alternating current) load (70).

Description

Technical Field

[0001] This invention relates to a regenerative braking power generation system for trailers, wherein a generator is installed in the brake disc space of the trailer, enabling it to generate electricity for the trailer itself. Background Technology

[0002] A trailer is generally a vehicle attached to a towing machine (tractor unit, towing device) to transport luggage or people without power. They are mainly divided into commercial trailers and camping trailers. Commercial trailers require power for interior lights, tailgates, refrigeration, etc., while camping trailers require power for indoor and outdoor lighting and for using household appliances such as televisions and refrigerators.

[0003] Currently, the power supply used in trailers is obtained from the battery of the tractor unit (tractor vehicle) or generated by a diesel generator set in the trailer.

[0004] On the one hand, when receiving battery power from the tractor side, some modifications to the tractor side vehicle are required during the wiring and setting up of additional power supply lines. On the other hand, there are many problems when using a diesel generator that is additionally installed on the trailer: not only is it necessary to frequently inject, store, and maintain diesel fuel, lubricating oil, etc., but also due to the constraints of the trailer's internal space, there are many restrictions and limitations on the installation and operation of the diesel generator. The diesel generator also generates noise and harmful gases during operation. Summary of the Invention

[0005] Technical issues

[0006] The problem to be solved by the present invention is to provide a regenerative braking power generation system for trailers, wherein a generator is installed in the brake disc space of the trailer, so that it can generate electricity for the trailer itself.

[0007] Problem-solving methods

[0008] The regenerative braking power generation system for trailers of the present invention includes: at least one axle fixed to the chassis of the trailer; a hub and a brake disc axially disposed outside the axle via a plurality of bearings and passively rotated; and a generator disposed in a recessed space on one side of the brake disc, the generator including: an annular rotor closely attached to and fixed to the inner circumferential surface of the space of 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.

[0009] The generator may be a permanent magnet synchronous generator (PMSG).

[0010] The stator coil can be wired to the interior of the trailer through the inside or outside of a through hole formed along the length of the axle.

[0011] The alternating current generated by the generator can be converted into direct current by the rectifier, then charged to the battery by the charging control unit and supplied to the DC load. The power of the battery can be converted into alternating current by the inverter and supplied to the AC load.

[0012] The inverter can simultaneously or selectively convert the output of three-phase AC power and single-phase AC power.

[0013] The effects of the invention

[0014] The present invention employs a generator 10 installed in the remaining space 7 of the brake disc 6 of the trailer, thereby solving the power supply problems of existing trailers by adopting a self-generating method that directly supplies the electrical energy required by the trailer.

[0015] The present invention has the following effects: the AC power generated by the generator 10 can be converted into DC power by the rectifier 20, and then charged to the battery 40 by the charging control unit 30 and supplied to the DC load 50. The power of the battery 40 can be converted into AC power by the inverter 60 and then supplied to the AC load 70, either separately or optionally.

[0016] This invention is a self-generating power source installed in the remaining space of the trailer. Therefore, it not only has excellent space utilization, but also eliminates the need for additional wiring to obtain power from the tractor. Since it is a regenerative braking method, it does not require a diesel generator, and does not generate the noise or harmful gases caused by the installation and operation of a diesel generator. It is a very useful invention with the effect of significantly reducing maintenance and management costs. Attached Figure Description

[0017] Figure 1 : A configuration diagram of a regenerative braking power generation system shown as an example of the present invention.

[0018] Figure 2 : A cross-sectional view of the state in which a generator is installed in the remaining space of the brake disc formed in the trailer in this invention.

[0019] Figure 3 A schematic diagram of a permanent magnet synchronous generator (PMSG) is shown as an example of the present invention.

[0020] Figure 4 : A circuit block diagram shown as an example of the present invention.

[0021] Figure 5 The following is a circuit diagram of a generator and rectifier unit as an example of the present invention.

[0022] Figure 6 The diagram shows the power output of a generator as an example of the present invention.

[0023] Figure 7 The phase voltage diagram of the generator is shown as an example of the present invention.

[0024] Figure 8 The phase current diagram of the generator is shown as an example of the present invention. Detailed Implementation

[0025] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. When describing embodiments of the present invention, the same constituent elements in the drawings are referred to by the same reference numerals whenever possible. To avoid obscuring the main idea of ​​the present invention, specific descriptions of related well-known structures or functions are omitted. Furthermore, the items shown in the drawings are schematic diagrams for ease of explanation of embodiments of the present invention and may differ from the actual implementation.

[0026] The regenerative braking power generation system 1 for trailers disclosed in this invention includes: at least one axle 3 fixed to the chassis 2 of the trailer; a hub 5 and a brake disc 6 axially disposed outside the axle 3 via multiple bearings 4 and passively rotated; and a regenerative braking generator 10 disposed in a recessed space 7 on one side of the brake disc 6. The generator 10 includes: a ring-shaped rotor that is closely attached to and fixed to the inner circumferential surface of the space 7 of the brake disc 6, and a plurality of permanent magnets 8 arranged or arranged at equal intervals; and a stator 9 fixed to the outer circumferential surface of the axle 3 corresponding to the rotor, and a stator coil 9a wound on 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.

[0027] In the space 7 of the brake disc 6, a plurality of permanent magnets 8 are arranged in a ring. When they rotate, they generate a rotating magnetic field. The fixed stator 9, which consists of a core 9b and a stator coil 9a that are inserted into and fixed to the outer circumference of the axle 3 and correspond to the plurality of permanent magnets 8, is interconnected with the rotating magnetic field and generates voltage, thus generating electricity for regenerative braking.

[0028] Figure 2 This is a structural diagram of the regenerative braking power generation system 1 for trailers of the present invention, comprising: at least one axle 3 fixed to the chassis 2 of the trailer; a hub 5 and / or a brake disc 6 axially disposed outside the axle 3 via a plurality of bearings 4 and passively rotating; a space 7 recessed into one side of the brake disc 6; a permanent magnet 8 attached to and fixed to the inner peripheral surface of the space 7 and rotating along the brake disc 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 the stator 9 of the generator 10 being such that... Figure 1 As shown, it is fixed to the outer circumferential surface of the bracket 12 fixed to the outer circumferential surface of the axle 3.

[0029] The permanent magnet 8 is equivalent to a rotor that rotates along the wheel and brake disc 6, and the stator 9 is equivalent to a fixture set on the trailer axle 3.

[0030] The permanent magnet 8 is a ring of multiple permanent magnets arranged at equal intervals. In the stator 9, three stator coils 9a are wound on a core 9b composed of multiple thin iron sheets. These three stator coils 9a are each induced by a pair of three-phase AC currents. The stator coils 9a can be Y-connected with a higher line voltage.

[0031] The stator coil 9a can be wired to the interior of the trailer through the inside or outside of a through hole formed along the length of the axle 3.

[0032] The generator 10 may be a permanent magnet synchronous generator.

[0033] The generator 10 can also be a brushless synchronous generator.

[0034] The advantages of the permanent magnet synchronous generator (PMSG) are that it uses permanent magnets, so its efficiency is about 90% higher than that of ordinary induction generators, it can be made small and lightweight, and it can operate at low speeds without gears.

[0035] The permanent magnet 8 is close to the gap 11 of the stator 9, but they do not rub against each other.

[0036] Figure 4 The circuit block diagram shown is an example of the present invention. The alternating current generated by the generator 10 is converted into direct current by the rectifier 20, which is composed of multiple full-wave diodes D1, D2, D3, D4, D5, D6 and smoothing capacitor C. The direct current is then charged to the rechargeable battery (secondary battery) or battery 40 by the charging control unit 30 and then supplied to the DC load 50. The power supply of the battery 40 is converted into 50-60Hz alternating current by the inverter 60 and then supplied to the AC load 70.

[0037] The charging control unit 30 may include a constant voltage unit and / or a constant current unit. Of course, the constant voltage and constant current units can be connected between the generator 10 and the charging control unit 30 to stabilize the power supply.

[0038] The inverter 60 can simultaneously convert the output of three-phase AC power and single-phase AC power, or selectively convert the output of one phase at a time.

[0039] The outputs of the battery 40 and the inverter 60 are provided with terminals or sockets that can be connected to two or more loads respectively, thereby enabling the connection and use of at least two AC loads 70 and DC loads 50.

[0040] The three-phase alternating current output from the three-phase stator coils phA, phB, and phC of the generator 10 of this invention is as follows: Figure 5 As shown, after rectification by multiple full-wave diodes D1, D2, D3, D4, D5, and D6, the current is smoothed by capacitor C, and then converted and output as DC (V+) to drive the DC load (LOAD) connected to the output.

[0041] The phase voltage, phase current, and output voltage of the generator 10 are determined based on the rotational speed (or rotational speed and intensity of the magnetic field) and intensity of the brake disc 6, and the number of turns of the stator coil 9a.

[0042] Figure 6 This is an example diagram showing the average power output of 1,291W when the rotational speed of generator 10, such as brake disc 6, is 400 rpm. Figure 7 This is an example diagram showing how a 202V phase voltage is obtained through generator 10. Figure 8 This is an example diagram showing how a phase current of 2.7A is obtained through generator 10.

[0043] In this invention, when the trailer is towed by a tractor (tractor vehicle, tractor device), the wheels and hub 5 rotate, and the brake disc 6 fixed to the hub rotates in conjunction. The permanent magnet 8 set in the space 7 rotates accordingly, generating a rotating magnetic field. The rotating magnetic field (magnetic flux) induces the stator coil 9a and generates a voltage, thereby generating electricity for regenerative braking. The alternating current generated by the generator 10 is converted into direct current by the rectifier 20 and then continues to charge the battery 40 through the charging control unit 30. It is then supplied to multiple DC loads 50 of the trailer, or supplied to multiple AC loads 70 through the inverter 60 for use.

[0044] In this invention, preferably, a generator 10 is provided in the remaining space 7 of at least one brake disc 6 in each trailer, thereby forming a plurality of generators.

[0045] As described above, the present invention is not limited to this embodiment and the accompanying drawings. Various substitutions, modifications and alterations can be made without departing from the technical concept of the present invention, which will be obvious to those skilled in the art.

Claims

1. A regenerative braking power generation system for trailers, wherein, The regenerative braking power generation system for trailers includes: At least one axle is fixed to the chassis of the trailer; The wheel hub and brake disc are axially mounted outside the axle via multiple bearings and rotate passively; and The generator is disposed in a recessed space on one side of the brake disc. The generator includes: An annular rotor, which is tightly attached to and fixed to the inner circumferential surface of the space portion of the brake disc, and has multiple permanent magnets arranged at equal intervals; and The stator, fixed to the outer circumferential surface of the axle corresponding to the rotor, is composed of three-phase stator coils. The three-phase AC power generated by the generator is converted into DC power by the rectifier, then used to charge the battery via the charging control unit and supplied to the DC load. The battery power is converted into 50-60Hz AC power by the inverter and supplied to the AC load. The inverter simultaneously or selectively converts the output of three-phase AC power and single-phase AC power.

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 regenerative braking power generation system for trailers according to claim 1 or 2, characterized in that, The stator coils are routed through the axle wiring to the interior of the trailer.

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