Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
  • H02K33/18—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K35/00—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
  • H02K35/04—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving coil systems and stationary magnets

Definitions

• the invention relates to an electrodynamic linear vibration motor, which is characterized by high force densities in the magnetic gap, magnetic return of the oscillating system in the middle position and a comparatively low weight of the oscillating system. With the motor electrodynamic conversion degrees up to 99% can be achieved.
• the linear vibration motor is particularly suitable as a drive for refrigeration and air conditioning systems with low power and for pump, injection and shock absorber systems in vehicle construction.
• compressors As a compressor for refrigeration and air conditioning systems with low power, as used in particular in the household sector, piston compressors are mainly used.
• Rotary compressors, such as Scroll compressors are only used for devices with drive capacities of several kilowatts for economic reasons.
• crank mechanisms are required to translate the rotary into the translatory motion required to operate reciprocating compressors.
• crank loops are used in which the frictional forces of the piston are eliminated on the bushing, without, as in the other crank mechanisms, technically complex crosshead mechanisms are required.
• MC motors have the advantage that a large permanent magnet can be used in the stator circuit, which enables high magnetic flux densities in the magnetic gap and high drive forces to be achieved. MC motors are therefore well suited for the operation of reciprocating compressors where low speeds (at high power) are needed. However, a magnetic bearing reset is missing. In addition, moving power supplies are required, but this disadvantage can be largely eliminated by a low-fatigue design.
• MM linear motors which are used as drives for reciprocating compressors.
• MM linear motors have the advantage that due to the reluctance force (principle of minimizing the magnetic field energy) a system-immanent provision of the oscillator takes place in the middle position, so that mechanical return systems, such. B. springs, can be dispensed with.
• mechanical return systems such. B. springs
• MM linear motors have the disadvantage that the magnetic flux density in the magnetic gap of the motor is relatively small, since, in order not to affect the kinetics of the oscillating system, the permanent magnet must be made as small and lightweight. As a result, only low driving forces are possible. Although these can be compensated by greater speeds of the vibration system, for use as a drive piston compressors, this is unfavorable.
• the starting point is an electrodynamic linear oscillation motor whose stator system is equipped with at least one magnet and whose oscillating system is movably mounted in the magnetic field of the stator.
• the vibration system of the engine comprises at least one core of a soft magnetic material, for.
• a soft magnetic material for.
• the magnets of the stator system as well as in the known MC motors, geometrically large and with high remanence and coercive force, so that a high magnetic flux density in the magnetic gap of the motor is achieved.
• the motor can thus be operated with high driving forces and with low speeds of the oscillating system.
• the oscillating system of the linear motor comprises a core made of a soft magnetic material, due to the reluctance force, a system-inherent provision of the oscillator takes place in the central position; As with MC linear motors, mechanical restoring systems (springs) can therefore be dispensed with.
• the core of the oscillating system of the linear motor can be designed in principle with much lower mass than the corresponding permanent magnet of MM motors; however, the vibration system consisting of the core and at least one coil is heavier than the voice coils of MC motors.
• the electrodynamic linear motor according to the invention largely combines the advantages of the known MC and MM linear motors.
• the stator system is designed as an annular disk-shaped magnet magnetized in the axial direction, on the two end faces of which there is in each case an annular pole disk made of a soft-magnetic material.
• the inner and outer diameters of the pole disks and of the annular disk-shaped magnet are either equal or the inner diameter of the pole disks is smaller than that of permanent magnets (eg to adapt the magnetic gap to the core diameter or to concentrate the magnetic flux or one of the coils save).
• the oscillating system is mounted concentrically and movably in the axial direction inside the stator system.
• It is composed of a soft-magnetic core, on which two separate drive coils are wound in such a way that, when the oscillatory system is in its central position, the coils are arranged in each case one of the magnetic gaps formed by the pole discs in connection with the disc-shaped magnet.
• the two drive coils are wound in opposite directions, so that, taking into account the direction of the magnetic flux in the columns during operation of the motor, the Lorentz forces acting on the coils add up.
• the core of the vibrating system is preferably cylindrical, wherein the Outer diameter of the oscillating system, which consists of the core and the two wound on these coils, is smaller than the inner diameter of the pole discs.
• the linear vibration motor according to the invention is very well suited as a drive motor both piston compressors for refrigeration and air conditioning systems as well as single or double piston linear compressors in gas chillers to produce very low temperatures.
• the motor can also be used advantageously as a drive motor of pumps in vehicle construction, which promote fuel, engine oil, cooling water or hydraulic fluids. Since it is possible to drive the linear vibration motor very quickly, it can also be used to control the injection of fuel in internal combustion engines.
• each mechanical valve could be replaced by a valve, which is controlled by a linear vibrating motor, and the camshaft control by a fully electronic.
• the linear oscillating motor according to the invention can also be operated as a linear generator, which is particularly suitable for generating electric power from drive systems with high power and small stroke, such.
• B. free-piston Stirling engines, is suitable.
• linear vibrating motor acts as a generator
• Another application in which the linear vibrating motor acts as a generator is to use the motor to damp the independent wheel suspensions in motor vehicles.
• the amount of damping can be controlled by the electrical load applied to the coils of the vibrating system.
• the stator system can be advantageously equipped with an electromagnet both in the engine and in the generator case, which results in the case of damping an additional control option for the damping of the independent wheel by means of the strength of the magnetic field of the stator.
• the generated electrical energy, The pulse-like output with strongly fluctuating voltage values can be modified by means of a rectifier with downstream transverter supplied to the electrical system of the motor vehicle.
• Fig. 1 a linear vibration motor with oscillating system in the middle position
• Fig. 2 a linear oscillating motor with deflected oscillating system.
• the stator system of the linear oscillating motor consists of the ring-shaped permanent magnet 4 magnetized in the axial direction, on each of whose two end faces the first and the second annular pole disk 5; 6 are located.
• the inner and outer diameter of the pole disks 5; 6 agree with those of the magnet 4.
• the oscillating system is mounted concentrically and movably in the axial direction in the interior of the stator system and consists of the ferrite core 1, on each of which the first and the second drive coil 2; 3 wound up. As long as the oscillating system is in its central position, the first coil 2 is located centrally in the first magnetic gap 7 and correspondingly the second coil 3 in the second magnetic gap 8.
• the moving power supply lines for the coils 2; 3 are laid so that they are only slightly bent.
• the linear oscillating motor For operation of the linear oscillating motor is an AC voltage to the drive coils 2; 3 applied, the an alternating electrical current through the coils 2; 3 causes. Since the coils are arranged in the stator magnetic field, Lorentz forces act on the current-carrying coils whose magnitude and direction are dependent on the magnitude and polarity of the applied operating voltage. Since the two drive coils 2; 3 are wound so that during operation of the motor on the coils 2; Add 3 acting Lorentz forces, the applied AC voltage causes an oscillation of the oscillating system, which has the same frequency as the AC voltage.
• the linear vibration motor operates at a frequency of 50 Hz, has a stroke of 10 mm and provides a mechanical power of 100 W with an efficiency of approximately 87%.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Reciprocating, Oscillating Or Vibrating Motors (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 2008
  • 2008-12-09 DE DE102008061205A patent/DE102008061205A1/de not_active Ceased
• 2009
  • 2009-11-04 EP EP09796603A patent/EP2347498A2/de not_active Withdrawn
  • 2009-11-04 WO PCT/DE2009/001554 patent/WO2010057460A2/de active Application Filing
  • 2009-11-04 BR BRPI0916034A patent/BRPI0916034A2/pt not_active IP Right Cessation
  • 2009-11-04 CN CN200980146634.5A patent/CN102349222B/zh not_active Expired - Fee Related
• 2011
  • 2011-05-18 US US13/110,438 patent/US8624448B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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