摘要:
The invention relates to a brake device (1) for rail vehicles, comprising an electromagnetic spring pressure brake, the brake force being applied by an elastic force to the part to be braked and a magnetic arrangement being provided for neutralizing the brake force. Said magnetic arrangement counteracts the elastic force and consists of a coil arrangement (6) and an armature plate (7) that are mobile in relation to each other, the mobile part being connected to the brake element (8) that impinges the part to be braked. The brake device for a rail vehicle according to the invention allows a high brake force and short reaction times and is very compact. For this purpose, the mobile part is connected to an axially displaceable plunger (2) which on one end can be impinged upon with the elastic force and which is connected on the other end to the brake element (8).
摘要:
A magnetic device is formed from a permanent magnet (12, 14) generating magnetic flux, and an armature (10) which can occupy either a first air gap in which the flux is in one direction, or a second air gap in which the flux is in the opposite direction, with a region of flux cancellation between the two air gaps. At least one electromagnet winding (36, 38) may be provided to which current can be supplied which when energised produces a magnetic flux in one direction or the other, depending on the direction of the current, the flux from the winding increasing the flux density in one of the air gaps and reducing the flux density in the other air gap. This effectively shifts the flux cancellation region towards or into one of the two air gaps so as to produce a flux density gradient extending from one air gap to the other, which will cause the armature to move into (or remain in) the air gap having the higher flux density, and continue to remain in that air gap after the current flow ceases. The device can be incorporated into a fluid valve to act as a drive for opening and closing the valve. It may also serve as the drive for opening and closing electrical contacts. Monostable operation can be achieved by locating a magnetic flux shunt at one end of the armature travel. A holding solenoid may be incorporated. A plurality of such devices controlling the opening and closing of a plurality of orifices in a manifold containing fluid especially gas or air, under positive pressure, may be controlled by signals from a computer controlled signal generator to produce an air cushion for supporting and/or conveying articles, or a sound wave whose amplitude and frequency is controlled by the signal generator. Such a device may be incorporated into a pipeline to influence the flow of fluid therethrough or into the exhaust or inlet manifold of a turbine or engine, especially a jet engine, to interact with the gases flowing therethrough and introduce or reduce turbulence or otherwise alter the gas flow.
摘要:
The invention relates to a multiple actuator for an electromechanically actuated valve. The inventive actuator comprises a housing (1, 2, 3) through which several armature shafts (9) extend. The armature shafts each comprise an armature (10) and two electromagnets which are situated inside the housing. Two springs (12, 68) impinge upon each armature (10) in order to displace them into an inoperative position between the electromagnets. This construction enables the available surface area to be optimally utilized by a valve to be actuated. The armature (10) has a maximum surface, and an optimal heat dissipation by thermal conduction can be attained via the corresponding underside (15) of the housing.
摘要:
A method is provided to control velocity of an armature of an electromagnetic actuator as the armature moves from a first position towards a second position. The electromagnetic actuator includes an electromagnet having a coil and a stator core at the second position. The method includes permitting the armature to move towards the stator core. Magnetic flux in a magnetic circuit created by the armature and electromagnet is determined when the armature is moving toward the stator core. The determined magnetic flux is used as a feedback variable to control energy to the coil so as to control a velocity of the armature as the armature moves towards the stator core.
摘要:
A method of controlling velocity of an armature of an electromagnetic actuator as the armature moves from a first position towards a second position is provided. The electromagnetic actuator includes a coil and a core at the second position. The coil generates a magnetic force to cause the armature to move towards and land at the second position. A control method is provided to ensure a near zero velocity landing of the armature in the second position while compensating for non-ideal external influences on the system.
摘要:
A magnetic device is formed from a permanent magnet (12, 14) generating magnetic flux, and an armature (10) which can occupy either a first air gap in which the flux is in one direction, or a second air gap in which the flux is in the opposite direction, with a region of flux cancellation between the two air gaps. At least one electromagnet winding (36, 38) may be provided to which current can be supplied which when energised produces a magnetic flux in one direction or the other, depending on the direction of the current, the flux from the winding increasing the flux density in one of the air gaps and reducing the flux density in the other air gap. This effectively shifts the flux cancellation region towards or into one of the two air gaps so as to produce a flux density gradient extending from one air gap to the other, which will cause the armature to move into (or remain in) the air gap having the higher flux density, and continue to remain in that air gap after the current flow ceases. The device can be incorporated into a fluid valve to act as a drive for opening and closing the valve. It may also serve as the drive for opening and closing electrical contacts. Monostable operation can be achieved by locating a magnetic flux shunt at one end of the armature travel. A holding solenoid may be incorporated. A plurality of such devices controlling the opening and closing of a plurality of orifices in a manifold containing fluid especially gas or air, under positive pressure, may be controlled by signals from a computer controlled signal generator to produce an air cushion for supporting and/or conveying articles, or a sound wave whose amplitude and frequency is controlled by the signal generator. Such a device may be incorporated into a pipeline to influence the flow of fluid therethrough or into the exhaust or inlet manifold of a turbine or engine, especially a jet engine, to interact with the gases flowing therethrough and introduce or reduce turbulence or otherwise alter the gas flow.
摘要:
Die Erfindung betrifft ein Verfahren zur Bewegungssteuerung eines Ankers (4d) eines elektromagnetischen Aktuators (4), insbesondere zur Betätigung eines Gaswechsel-Hubventiles (1) einer Brennkraftmaschine, wobei der Anker (4d) oszillierend zwischen zwei Elektromagnet-Spulen (4a, 4b) jeweils gegen die Kraft zumindest einer Rückstellfeder (2a, 2b) durch alternierende Bestromung der Elektromagnet-Spulen bewegt wird, und wobei mit einer Annäherung des Ankers an die zunächst bestromte Spule während des sogenannten Fangvorganges die an der den Anker einfangenden Spule anliegende elektrische Spannung reduziert wird. Erfindungsgemäß schließt sich an die Fangphase des Fangvorganges eine Bremsphase an, in welcher bis zum Auftreffen des Ankers auf die Spule an diese getaktet elektrische Spannung angelegt wird, wobei die jeweiligen Schalt-Zeitpunkte und das Spannungs-Taktverhältnis von einem Regler anhand einer die Anker-Sollbewegung beschreibenden Solltrajektorie bestimmt werden. Bevorzugt wird getaktet entweder ein betragsmäßig konstanter positiver oder negativer Spannungswert oder der Spannungswert Null" an die den Anker einfangende Spule angelegt.
摘要:
A method is provided to control velocity of an armature of an electromagnetic actuator as the armature moves from a first position towards a second position. The electromagnetic actuator includes an electromagnet having a coil and a stator core at the second position. The method includes permitting the armature to move towards the stator core. Magnetic flux in a magnetic circuit created by the armature and electromagnet is determined when the armature is moving toward the stator core. The determined magnetic flux is used as a feedback variable to control energy to the coil so as to control a velocity of the armature as the armature moves towards the stator core.
摘要:
Die Erfindung betrifft ein Verfahren zur Bewegungssteuerung eines Ankers (4d) eines elektromagnetischen Aktuators (4), insbesondere zur Betätigung eines Gaswechsel-Hubventiles (1) einer Brennkraftmaschine, wobei der Anker (4d) oszillierend zwischen zwei Elektromagnet-Spulen (4a, 4b) jeweils gegen die Kraft zumindest einer Rückstellfeder (2a, 2b) durch alternierende Bestromung der Elektromagnet-Spulen bewegt wird, und wobei mit einer Annäherung des Ankers an die zunächst bestromte Spule während des sogenannten Fangvorganges die an der den Anker einfangenden Spule anliegende elektrische Spannung reduziert wird. Erfindungsgemäß schließt sich an die Fangphase des Fangvorganges eine Bremsphase an, in welcher bis zum Auftreffen des Ankers auf die Spule an diese getaktet elektrische Spannung angelegt wird, wobei die jeweiligen Schalt-Zeitpunkte und das Spannungs-Taktverhältnis von einem Regler anhand einer die Anker-Sollbewegung beschreibenden Solltrajektorie bestimmt werden. Bevorzugt wird getaktet entweder ein betragsmäßig konstanter positiver oder negativer Spannungswert oder der Spannungswert Null" an die den Anker einfangende Spule angelegt.