WO2008082284A1 - Dynamo pour bicyclette - Google Patents

Dynamo pour bicyclette Download PDF

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Publication number
WO2008082284A1
WO2008082284A1 PCT/LV2006/000011 LV2006000011W WO2008082284A1 WO 2008082284 A1 WO2008082284 A1 WO 2008082284A1 LV 2006000011 W LV2006000011 W LV 2006000011W WO 2008082284 A1 WO2008082284 A1 WO 2008082284A1
Authority
WO
WIPO (PCT)
Prior art keywords
armature
magnetic circuit
generator
magnetic flux
magnetic
Prior art date
Application number
PCT/LV2006/000011
Other languages
English (en)
Russian (ru)
Inventor
Valerijs Bezrukovs
Nikolajs Levins
Original Assignee
Ventspils Augstskola
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ventspils Augstskola filed Critical Ventspils Augstskola
Priority to PCT/LV2006/000011 priority Critical patent/WO2008082284A1/fr
Publication of WO2008082284A1 publication Critical patent/WO2008082284A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/38—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating flux distributors, and armatures and magnets both stationary
    • H02K21/44—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating flux distributors, and armatures and magnets both stationary with armature windings wound upon the magnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
    • B62J6/00—Arrangement of optical signalling or lighting devices on cycles; Mounting or supporting thereof; Circuits therefor
    • B62J6/06—Arrangement of lighting dynamos or drives therefor
    • B62J6/12—Dynamos arranged in the wheel hub

Definitions

  • the invention relates to electrical engineering, in particular to electric AC machines with a rotating magnetic flux distributor, a fixed armature and a magnet, and also an armature winding covering the armature magnetic core and a magnet, and can be used as a generator for a bicycle.
  • the generator for a bicycle [1] consists of a housing inside of which a fixed magnetic core of the armature with a winding and a rotating rotor with a permanent magnet are placed.
  • the generator rotor is connected to a shaft, at the end of which a roller is mounted.
  • the generator housing is attached to the fork of the bicycle wheel and has a clamping device that presses the roller to the tire cover of the bicycle.
  • the permanent magnet rotor starts to rotate and magnetizes the armature magnet core.
  • an alternating voltage arises in the winding, the magnitude of which depends on the frequency of rotation of the bicycle wheel.
  • the torque from the bicycle wheel is transmitted to the generator rotor by means of a friction gear.
  • the magnitude of this moment depends on the force with which the roller is pressed against the tire cover. As a result of this, losses in the wheel bearing increase and the overall efficiency of such a design is significantly reduced.
  • the generator for a bicycle [2] consists of a cylindrical magnetic circuit with a permanent magnet, which are mounted on the wheel hub, and a stationary magnetic circuit with a winding, which are connected to the frame of the bicycle.
  • the winding is placed inside a permanent magnet, which has a cylindrical shape.
  • Alternating voltage occurs in the generator winding as a result of magnetic flux ripple, which occurs due to a change in the resistance of the magnetic circuit during rotation of the permanent magnet core.
  • the diameter of the permanent magnet located on the rotating part of the generator must be larger than the outer diameter of this coil.
  • the diameter of the coil in this case cannot be less than the diameter of the wheel hub of the bicycle. This circumstance significantly affects the flow rate. winding wire and expensive material from which the magnet is made, which ultimately increases the cost of the generator.
  • a generator for a bicycle [3] containing a permanent magnet, an armature with a fixed charge magnetic core and an annular coil covering the armature magnetic core.
  • the permanent magnet is made in the form of a cylinder and is placed inside the hub of the bicycle wheel.
  • the magnetic core of the armature is made in the form of a cylinder with lateral claw-like protrusions that cover the winding on one and the other side.
  • the claws are offset relative to each other and alternate with a certain step around the entire circumference around the annular winding.
  • the permanent magnet is separated from the claw-like protrusions of the armature magnetic circuit by an air gap and can rotate relative to the armature magnetic circuit with a winding, which are fixed on the axis of the bicycle wheel.
  • On the inner surface of this magnet a multi-pole system is formed with the number of poles and a pitch corresponding to the pole system formed by claw-like protrusions.
  • the magnetic flux from one pole of the permanent magnet passes through the claw-shaped protrusion closest to it, the cylindrical part of the armature magnetic circuit and closes to the other pole through the corresponding claw-shaped protrusion, shifted by the same step as the opposite pole of the permanent magnet.
  • the magnetic flux from poles of the same polarity is distributed evenly across all claw-like protrusions located on one side and closes to poles of opposite polarity, passing around the annular winding through the magnetic core of the armature and claw-shaped protrusions located on the other side.
  • the sleeve rotates with the wheel and the poles of the permanent magnet move relative to the claw-like protrusions.
  • the polarity of the poles of the permanent magnet alternates over the claw-like protrusions, and the magnetic flux in the armature magnetic core changes direction accordingly.
  • the armature winding is interlocked with an alternating magnetic flux and an alternating voltage is induced in it with a frequency corresponding to the frequency of rotation of the bicycle wheel. Since the winding placed on the stationary part of the bicycle, then to connect the generator to the load, the ends of the winding are displayed through a slot in the wheel axis.
  • the purpose of the invention is to simplify the design, reduce the cost of manufacturing technology and increase the reliability of the design of the generator for a bicycle.
  • the generator for a bicycle contains a permanent magnet, an armature with a fixed lined magnetic circuit and an annular coil covering the magnetic circuit of the armature.
  • the generator is equipped with a magnetic flux switch, consisting of a magnetic circuit with teeth, and the armature magnetic circuit is made of two arcuate segments - external and internal, between which the said permanent magnet is placed, while the armature magnetic circuit with an annular winding is designed to be placed on the frame, and the switch magnetic flux for fixing on a rotating sleeve of a bicycle wheel.
  • the distance between the ends of the inner segment - g, and the adjacent ends of the outer and inner segments - r 2 is advisable in the generator for a bicycle, the distance between the ends of the inner segment - g, and the adjacent ends of the outer and inner segments - r 2 to determine from the ratio
  • m v> 2 (k h2 ⁇ y 2 ) ⁇ , (1) where k - 0, 1, 2, ...
  • Fig. 1 shows a structural arrangement of a magnetic circuit of an armature with a winding and a gear switch of a magnetic flux.
  • Fig. 2 shows a linear scan of the armature magnetic circuit with a winding for one position of the teeth of the magnetic flux switch, which moves in the direction of arrow V.
  • the distances between the teeth of the magnetic flux switch and the ends of the arcuate segments of the armature magnetic circuit are indicated by ⁇ , T 1 ViT 2 : Direction and path , along which the main magnetic flux closes, is shown by line F.
  • Fig. 3 shows the change in the direction of the main magnetic flux ⁇ when the teeth of the magnetic flux switch are shifted by a step equal to ⁇ 12.
  • the generator for a bicycle contains a permanent magnet 1, an armature with a fixed charge magnetic circuit and an annular coil 2 covering the armature magnetic circuit.
  • the generator is equipped with a magnetic flux switch, consisting of a magnetic circuit 3 with teeth 4.
  • An armature magnetic circuit is made of two arcuate segments - an external 5 and an internal 6, between which the mentioned permanent magnet 1 is placed, while the armature magnetic circuit with an annular winding 2 is designed to be mounted on a frame, and a magnetic flux switch for mounting on a rotating sleeve of a bicycle wheel.
  • the magnetic flux switch is made in the form of a ring with teeth 4, which have a step of ⁇ and are separated from the ends of the arcuate segments 5 and 6 of the armature core by an air gap of ⁇ .
  • the distances between the ends of the inner segment 6 - T 1 and the adjacent ends of the outer 5 and inner 6 segments - ⁇ 2 are determined from the relation (1), where / s - 0, 1, 2, ....
  • the magnetic circuit 3 of the magnetic flux switch is made laden.
  • the permanent magnet 1 is magnetized in the transverse direction.
  • the operation of the generator is as follows.
  • the design of the proposed generator is designed to convert mechanical energy spent on rotation of the bicycle wheel into alternating voltage, which is induced in winding 2 under the influence of an alternating magnetic flux coupled by this winding.
  • the ring winding 2 is located on an arcuate magnetic circuit, having the form of a three-layer sandwich, in which the outer 5 and inner 6 segments are made of lined electrical steel, and between them there is a permanent magnet 1.
  • the material of the permanent magnet 1 is magnetized in the transverse direction and its magnetic flux is directed perpendicular to the winding 2.
  • the magnetic core of the anchor is fixed on the frame of the bicycle so that the ends of the segments 5, 6 are located above the teeth 4 of the magnetic flux switch. In this case, the ends of segments 5, 6 and teeth 4 are separated by an air gap ⁇ .
  • the teeth 4 on the magnetic circuit 3 are made evenly with a step ⁇ .
  • the armature magnetic circuit is performed in such a way that the distances between the ends of the arcuate inner segment 6 - g, and between the adjacent ends of the outer 5 and inner 6 segments - ⁇ 2 should be calculated in accordance with expression (1).
  • a chain is formed for the magnetic flux ⁇ , which passes from the pole N of the permanent magnet 1 along one half of the outer segment 5, through two adjacent teeth 4 on the magnetic circuit 3 and through the opposite half of the inner segment 6 to the pole of the opposite polarity S of this magnet.
  • a chain is formed for the main magnetic flux ⁇ , which is coupled to the annular winding 2.
  • the magnetic flux switch Since the magnetic flux switch is made movable, the displacement of the teeth 4 by a step equal to ⁇ / 2 leads to a change in the circuit along which the main magnetic flux F. closes. With this position of the teeth 4, as shown in fig. ⁇ , the winding 2 is linked to the magnetic flux opposite direction.
  • the magnetic circuit 3 of the magnetic flux switch is performed in in the form of a ring of lined electrical steel and mounted on a bicycle wheel hub.
  • the rotation of the wheel leads to a continuous switching of the magnetic circuits, as a result of which an alternating voltage of a sinusoidal shape is induced in the winding 2.
  • the power of the generator of this design is determined by the formula
  • W is the number of turns of the winding 2
  • Z is the number of teeth 4 on the magnetic circuit 3 of the magnetic flux switch
  • p is the frequency of rotation of the magnetic flux switch mounted on the bicycle wheel.
  • the generator can be easily adapted for mounting on the wheel hub of all existing models of bicycles, which expands the scope of its use.
  • the design of the generator allows sufficiently technologically advanced production of laden magnetic cores of the armature and magnetic flux switch and to reduce the cost of its manufacture.
  • Patent JP Ns 2004182183 publication July 2, 2004, MKI 7 B62J6 / 00;

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne le domaine des équipements électriques et des machines électriques à courant alternatif dotées d'un distributeur rotatif de flux magnétique avec un induit fixe et un aimant. Le dynamo pour bicyclette comprend un aimant permanent (1), un induit doté d'un circuit magnétique fixe en forme de pile et un enroulement annulaire (2) enveloppant le circuit magnétique de l'induit. Le générateur est doté d'un commutateur de flux magnétique constitué d'un circuit magnétique (3) doté d'une indentation (4). Le circuit magnétique de l'induit comprend deux segments en arc de cercle, un extérieur (5) et un intérieur (6), entre lesquels on a disposé l'aimant permanent (1). Le circuit magnétique de l'induit avec un enroulement annulaire (2) est destiné à être fixé au cadre, et le commutateur de flux magnétique est destiné à être fixé sur le moyeu rotatif d'une roue de bicyclette. Le commutateur de flux magnétique se présent comme une roue dotée d'une indentation (4), cette dernière possédant un pas ζ et étant séparée des extrémités des segments en arc de cercle (5, 6) du circuit magnétique de l'induit par un entrefer δ. Les distances entre les extrémités du segment intérieur (6) τ 1 et les extrémités adjacentes des segments intérieur (5) et extérieur (6) τ 2 est défini sur la base de la proportion (1) dans laquelle k - 0, 1, 2,.... Le circuit magnétique du commutateur de flux magnétique se présente comme une pile. L'aimant permanent est aimanté en direction transversale.
PCT/LV2006/000011 2006-12-28 2006-12-28 Dynamo pour bicyclette WO2008082284A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/LV2006/000011 WO2008082284A1 (fr) 2006-12-28 2006-12-28 Dynamo pour bicyclette

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/LV2006/000011 WO2008082284A1 (fr) 2006-12-28 2006-12-28 Dynamo pour bicyclette

Publications (1)

Publication Number Publication Date
WO2008082284A1 true WO2008082284A1 (fr) 2008-07-10

Family

ID=39588836

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/LV2006/000011 WO2008082284A1 (fr) 2006-12-28 2006-12-28 Dynamo pour bicyclette

Country Status (1)

Country Link
WO (1) WO2008082284A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE417222C (de) * 1924-02-28 1925-08-06 Schlesinger Fa P Magnetelektrische Maschine zur Beleuchtung von Fahrraedern u. dgl.
DE467250C (de) * 1926-11-05 1928-10-22 Italiana Magneti Marelli Socie Magnetelektrische Zuendmaschine fuer Brennkraftmaschinen
SU23786A1 (ru) * 1930-01-09 1931-10-31 Л.О. Гельгар Электрический генератор дл велосипеда
GB2166910A (en) * 1984-11-08 1986-05-14 Kenkichi Kumakura Generator for use on bicycle
RU2256580C2 (ru) * 1999-12-28 2005-07-20 Тармо СЬЁБЕРГ Генератор

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE417222C (de) * 1924-02-28 1925-08-06 Schlesinger Fa P Magnetelektrische Maschine zur Beleuchtung von Fahrraedern u. dgl.
DE467250C (de) * 1926-11-05 1928-10-22 Italiana Magneti Marelli Socie Magnetelektrische Zuendmaschine fuer Brennkraftmaschinen
SU23786A1 (ru) * 1930-01-09 1931-10-31 Л.О. Гельгар Электрический генератор дл велосипеда
GB2166910A (en) * 1984-11-08 1986-05-14 Kenkichi Kumakura Generator for use on bicycle
RU2256580C2 (ru) * 1999-12-28 2005-07-20 Тармо СЬЁБЕРГ Генератор

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