RU35847U1 - Magneto contactless aggregate - Google Patents

Description

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MAGNETO CONTACTLESS UNIT

Non-contact magneto aggregate refers to thyristor ignition systems with a flywheel magnetic system and is designed to process control pulses supplied to a high-voltage ignition coil in order to creep spark discharges on spark plugs of an internal combustion engine (ICE).

Ignition systems are known where a permanent magnet with pole tips mounted on a flywheel and a fixed electronic unit with a charging coil is used as an excitation source.

According to the proposed solution, electronic ignition is known with a flywheel magnetic system for an air-cooled engine and a method of installing a magnetic system comprising a flywheel mounted on a crankshaft shaft, to the base of which a magnetic system is attached with mechanical reinforcement, having a permanent magnet that contacts 1 with pole pieces placed in a magnetic screen, and a fixed electronic unit located on the outside of the flywheel with a charging ignition coil (patent fo 2081343, IPC 6 F 02 P 1 / 02, Bull. No. 16 dated 06/10/97).

MPK7P02 PI / 02; 3/06

elements placed in the magnetic screen and pressing the permanent magnet inclined pole surfaces to the inner surfaces of the pole pieces, the base is made in the form of an upright fan placed in the flywheel, a steel ring with a balancing slot, to the supporting surface of which through mounting shut-off elements interacting with mechanical reinforcement attached magnetic system.

This solution allows you to intensify the magnetic flux while maintaining the size of the flywheel system, to increase manufacturability and simplify the design by reducing the weight and dimensions.

The closest in technical essence and the achieved result when using is a non-contact magneto (prototype) containing an inductive sensor with a core and a winding, a generator coil with a composite U-shaped magnetic circuit, installed near the flywheel with at least one magnet, an ignition coil and an electronic unit, inputs which are connected to the sensor winding and the generator coil, and the output to the ignition coil, the output of which is connected to the spark plug.

A distinctive feature of non-contact magneto is that the magnetic circuit of the generator coil is made of three parts, the direction of each of which is oriented along the magnetic field vector, the sensor core is made of carbon steel, and its longitudinal axis is at an acute angle to the tangent drawn to the magnet rotation path through the point of its approach, when receiving, the end of the core facing the flywheel is pointed, and its opposite end is bent at a right angle to the axis of the core (A. S. No. 176879 5, IPC 5 F 02 P1 / 02, Bull. No. 38 dated 05.15.90).

Such a solution makes it possible to increase the energy performance, reduce the loss of high-voltage energy, automatically adjust the ignition timing in the flywheel speed range, and

- 2 also simplify the setup, adjustment and installation of magneto maintenance.

The mentioned technical solutions (analogue and prototype) have a number of significant disadvantages:

- there is no possibility of creating a large magnetic flux through the core of the charging coil, since the magnet is magnetized in length, significantly exceeding 1, its cross-sectional dimensions and magnetic losses in it inevitably limit the magnetic flux;

-large weight and dimensions;

- with large dimensions, it is difficult to get a steep front of change

magnetic flux - and therefore a large emf in the coil;

- in a design with two pole tips, the magnetic flux through the core of the charging coil changes only in amplitude.

The claimed technical solution is devoid of the above disadvantages and allows you to:

- for small dimensions and light weight, get a steep front of magnetic flux change and, as a result, a large EMF;

-to minimize interference;

-automatically adjust the ignition timing within 18.

The technical result is achieved in that in a magneto housing comprising a flywheel-magnetic system mounted on a shaft, including: a flywheel and permanent magnets mounted on it with pole tips, inductive sensors with a core and winding, an electronic unit with a coil charging the capacitor on the shaft Impossible: two flywheel interconnected are clearly installed, one of which is a generator, equipped with three magnetic systems shifted in the plane of the flywheel relative to each other at an angle of 120 and

..g /

- 5 made in the form of three-part prefabricated pole lugs, the middle section of which is connected to two permanent magnets of the same polarity, and the other, a sensor flywheel mounted on the shaft, is cup-shaped with a permanent magnet magnetic system with one pole tip mounted in its cavity, with the possibility of alternately creating a magnetic flux in the cores of sensors located in a stationary holder radially at an angle of 120 relative to each other.

The presence of the generator’s magnetic system, equipped with two flat rectangular rectangular magnets magnetized on the short side and connected to the middle pole tip of the same polarity, allows to obtain a large voltage across the storage capacitor. This also makes it possible to obtain a maximum magnetic flux that varies not only in magnitude, but also in direction, and due to the flattening of magnips, the change occurs at the maximum angular displacement, i.e. with maximum.

Since the magnets are adjacent to the pole pieces with the largest area, and are flat, the magnetic flux at this induction of the material is maximum with minimal magnetic loss.

The presence of a bowl-shaped sensor flywheel made of ferromagnetic material with the sensor magnetic system located in it and the holder of sensors allow minimizing the noise induced by the scattering fields of the generator unit. The choice of the core material of the sensor with increased coercive force serves the same purpose.

In FIG. 1 shows a general sectional view of magneto.

2, a generator flywheel with a magnet system.

The non-contact modular magneto consists of: a stator, including the upper half-housing 1 (Fig. 1) with an electronic unit 2, consisting of three thyristor keys, each controlled by its own sensor, which

- 4

placed on a printed circuit board filled with a compound; clips of the sensor 3, the lower half-housing 4 with the generator unit 5, consisting of two windings on a common U-shaped core and a rectifier with a storage capacitor on a single board 6; from the rotor, consisting of two generator flywheels 7 (Fig. 1, 2) and sensor 8 (Fig. 1), rigidly fastened both to each other and to the shaft 9, which is sitting in the sub-posts 10. The drive coupling 11 is firmly mounted on the shaft.

On the generator flywheel 7 (Fig. 1, 2) three magnetic systems are fixed through 120, each of which consists of two permanent magnets 12 (Fig. 2) and three pole pieces 13, (Figs. 1, 2), and both permanent magnets are pressed to the middle tip of the same poles.

The sensor flywheel 8 (Fig. 1) is made of a cup-shaped ferromagnet, inside of which a magnetic system is fixed, consisting of one permanent magnet 14 and a pole piece 15.

The holder of the sensors 3 is fixed inside the upper half housing with screws

16 with the possibility of angular adjustment and is equipped with three inductive sensors located through 120, each of which has a winding

17 with a core 18. The upper and lower half-bodies, with the rotor located inside, are tightened with screws 19.

The work of magneto is as follows.

After turning on the engine, the rotation by means of the coupling half 11 (Fig. 1) is transmitted to the flywheel block - generator 7 (Figs. 1, 2) and sensor 8 (Fig. 1). Since three systems are fixed on the generator flywheel 7 at an angle of 120, three times during one revolution in the coils of the generator block the EMF variable is induced, which charges the storage capacitor through the diodes (to hell, not shown).

A flywheel of sensors 8 (Fig. 1) with one magnetic system rigidly fastened to a generator flywheel 7 alternately in one revolution induces in three sensors 17 located at an angle of 120 fixed in

- 5 clip 3, variable EMF, which are fed through diodes to the control electrodes of the respective thyristors. According to these sensor signals, the thyristors are alternately unlocked, discharging the storage capacitor to the primary windings of the ignition coils.

The relative position of the rigidly C1-fixed generator and sensor flywheels is selected so that at any speed the signal from the sensor arrives no earlier than the storage capacitor process ends.

The proposed technical solution is manufactured and tested under production conditions, which allowed to solve the problem with a positive result.

Director DUP Semiconductor Instrumentation Plant

- b L.N. SURDUL

Claims (1)

A magneto-contactless aggregate, comprising a housing mounted on a shaft with a flywheel-magnetic system, including a flywheel and permanent magnets with pole tips mounted on it, inductive sensors with cores and windings, a generator unit with a coil charging the storage capacitor and side of electronic keys, characterized in that two flywheel connected to each other are fixedly mounted on the shaft, one of which - the generator - is equipped with three magnetic systems shifted in the plane of the flywheel relative to at an angle of 120 ° and made in the form of three-section prefabricated pole pieces, the middle section of which is connected to two permanent magnets of the same polarity, and the other handwheel mounted on the shaft - sensor - is made in a cup-shaped form with a permanent magnet magnet system installed in its cavity with one pole tip with the ability to alternately create control signals in the windings of sensors located in a stationary holder radially at an angle of 120 ° relative to each other, which control vlyayutsya electronic (thyristor) keys.