Abstract: The invention relates to a device for safeguarding uninterrupted power supply of a magnetic bearing (5) in the event of a power supply voltage (U) failure. Said device comprises: a first frequency converter (2) which is supplied with power by the supply voltage (U) and controls a motor (3), and a transformer (7) which is connected to a rectifier (8) and the motor (3), said rectifier (8) supplying a DC-link electric circuit (11) of a second frequency converter (14) controlling the magnetic bearing (5) with power in the event of a power supply voltage failure. The invention allows prevention of damages to the magnetic bearing in the event of disruption of power supply of the magnetic bearing in the event of a power supply voltage failure.

Abstract: An exciting voltage arithmetic portion calculates an exciting voltage of an electromagnet using a signal of a gap sensor. On the other hand, a sensorless exciting voltage arithmetic portion calculates an exciting voltage of the electromagnet using a signal of the current sensor. The exciting voltage adjusting portion adjusts a mixing ratio between an output value of an exciting voltage arithmetic portion and an output value of the sensorless exciting voltage arithmetic portion corresponding to a gap length. The excitation of the electromagnet is controlled according to an output value of the exciting voltage adjusting portion so as to reduce influences of noises on the gap sensors thereby always achieving a stable levitation control.

Abstract: An apparatus comprises a movable member, first and second rigid members positioned on opposite sides of the movable member, a first suspension assembly connected between a base and the first and second rigid members, a second suspension assembly connected between the first and second rigid members and the movable member, first and second actuators coupled to the first and second rigid members along a first central axis, and third and fourth actuators coupled to the movable member along a second central axis.

Abstract: A sensor system for a magnetic hearing, which has two actuator coils, two clocked power output stages, a current sensor for detecting those currents in the actuator coils which are encumbered with a ripple current, and a sensor interface. The clocked power output stages provide a pulse-width-modulated output voltage, the pulse width of which is narrowed or widened by small amounts in a predefined order, and the pulse widths of the clocked power output stages are modulated in a fixed phase relationship with respect to one another. The sensor system specifies a sensor system for a magnetic bearing with a clocked power output stage. A magnetic bearing, a control device for a magnetic bearing and a method for detecting the position in a magnetic bearing are also disclosed.

Abstract: A control system for controlling and synchronizing a plurality of medium-voltage vacuum contactors comprises a two-level network structure. A dedicated network includes a plurality of servant control units operably coupled to the vacuum contactors and configured to ascertain a plurality of different data and conditions thereof. In addition, the dedicated network includes a master control unit in serial communication with the servant control units and configured to send and receive communications therewith. The master control unit is operably coupled to a control network including a plurality of various control devices. The master control unit is configured to send predetermined data received from the servant control units to the control network. The two-level network structure enables relatively jitter free communication on the dedicated network while not overwhelming the control network with unnecessary data.

Abstract: An elevator includes guide rails laid in an elevator shaft vertically, an elevator car moving up and down along the guide rails, guiding units provided on the elevator car for guiding it, the guiding unit having a magnet unit including cores and coils forming electromagnets to generate a magnetic force against the guide rail through an air gap and a controller for controlling the magnetic force by maneuvering an exciting current for exciting the electromagnets. The controller controls the magnetic force so as to make the guiding units in non-contact with the guide rails when the elevator car is traveling and brings the guiding units into contact with the guide rails when the elevator car is stopped, so that the guiding units attract and fix the guide rails while the elevator car is stopped.

Abstract: A method for progressively introducing current into, or removing current from, a superconducting coil mounted on a former, in which the coil vibrates relative to the former.

Abstract: A method and apparatus for moving magnetic material includes an electromagnet for lifting the magnetic material where upon its release, the residual magnetic flux of the lifted magnetic material is reduced. The apparatus includes a generator coupled to the electromagnet. The generator includes a control input and an armature having a voltage output. A controller has an output coupled to the generator's control input and armature voltage output, whereupon receiving a release material signal from an operator interface panel to release the magnetic material from the electromagnet, the controller transmits a plurality of control signals, one of which is at least partially dependent upon the duration of a previously transmitted control signal, to effectively alternate the polarity and reduce the magnitude of the magnetizing force of the electromagnet.

Abstract: A fabrication process produces markers for a magnetomechanical electronic article surveillance system. The marker includes a magnetomechanical element comprising one or more resonator strips of magnetostrictive amorphous metal alloy; a housing having a cavity sized and shaped to accommodate the resonator strips for free mechanical vibration therewithin; and a non-deactivatable bias magnet adapted to magnetically bias the magnetomechanical element. The process employs adaptive control of the cut length of the resonator strips, correction of the length being based on deviation of the actual marker resonant frequency from a preselected, target marker frequency. Use of adaptive, feedback control advantageously results in a much tighter distribution of actual resonant frequencies. Also provided is a web-fed press for continuously producing such markers with adaptive control of the resonator strip length.

Abstract: It is realized to efficiently energize a lifting magnet device, and reduce the devices used in an energization system of the lifting magnet device in size, energy consumption, and noise as well. Other than a lifting magnet device 8, the handling machine includes an engine 1 and an electric generator 5, which form a power source; a storage battery 20 for storing electric energy from the power source; and a generator motor (or a drive source for a driven body) 18 for driving an upper rotary body in which regenerative electric energy can be produced. The power source and the storage battery 20 are connected to be capable of supplying electric energy to the lifting magnet device 8. The generator motor 18 for driving the upper rotary body is connected to be capable of supplying its own regenerative electric energy to the storage battery 20.

Abstract: A machine includes a plurality of electronic controllers electrically connected to an electrical power source along a first electrical circuit through a first relay and along a second electrical circuit through a second relay. A relay controller is directly connected to the electrical power source along a third electrical circuit, and is in communication with the first relay and the second relay. The relay controller is configured to open or close the first relay or the second relay in response to a power requirement indication.

Abstract: Problem of the present invention is to enable elimination or reduction of a signal wire in a dedicated cable for a magnetic bearing device for supplied an electric power from a control device to a magnetic bearing main unit via the dedicated cable. A magnetic bearing device 100 according to the present invention has a magnetic bearing main unit 10 having an electromagnet 12M for magnetically levitating and rotatably supporting a magnetic rotating body 11 and functioning as a magnetic bearing, a control device 20 having a compensating circuit 25 for generating a control signal for controlling a levitation position of the magnetic rotating body 11, and an electricity supply line 30L for supplying an electric power from the control device 20 to the magnetic bearing main unit 10.

Abstract: Disclosed are methods of fabricating nanogaps and various devices composed of nanogaps. The nanogap devices disclosed herein can be used as in a number of electronic, photonic and quantum mechanical devices, including field-effect transistors and logic circuits.

Abstract: In a magnetic coupler device comprising: a magnetic field generation circuit generating a magnetic field according to an input current; and a detection bridge circuit including a pair of magnetoresistance effect devices, a resistance value of each of the magnetoresistance effect devices changing by applying a magnetic field generated by said magnetic field generation circuit to each of the magnetoresistance effect devices, and having two outputs between which a voltage difference is generated according to an intensity of the magnetic field generated by said magnetic field generation circuit, by forming a geometric shape of each of said magnetic field generation circuit and said detection bridge circuit in line symmetric or point symmetric, a high S/N ratio is obtained even with high frequency.

Abstract: Embodiments in accordance with the present invention provide a degaussing device and a degaussing method capable of efficiently degaussing a magnetic disk, especially, a magnetic disk of the perpendicular magnetic recording system, without resorting to a magnetic field of a high intensity. Embodiments in accordance with the present invention provide a degaussing method of degaussing a magnetic disk not yet installed in a magnetic disk drive by applying an external magnetic field to the magnetic disk by a degaussing device. In accordance with one embodiment, the method includes disposing the magnetic disk in the degaussing device such that the direction of an external magnetic field is inclined at an angle to the axis of easy magnetization of the magnetic disk.

Abstract: A magnetizing coil generates a magnetic field to magnetize a magnet in a magnetizing area, in which a direction of the magnetic field is generally parallel to a magnetization direction of the magnet. A magnetizing yoke holds the magnet and is made of a magnetic material, which exhibits a magnetic potential that is generally equal to a magnetic potential of the magnet in the magnetic field at time of magnetizing the magnet. The magnetizing yoke and the magnet substantially fill a projected area of the magnet in the magnetizing area on each of first and second sides of the magnet that are opposite from each other in the magnetization direction of the magnet in the magnetizing area.

Abstract: Disclosed is a magnetic bearing system capable of simplifying a demodulation operation and reducing a processing load associated with a magnetic levitation control. A carrier signal having a frequency fc is apply to a sensor through a filter. The sensor operates to modulate the carrier signal, and a difference amplifier operates to calculate a difference between the amplitude-modulated signal FAM (t) and a sensor reference signal Fstd (t). An A/D converter operates to A/D convert a difference signal Fsub (t) output from the difference amplifier to a discretized sensor signal. In the A/D conversion, a sampling frequency fs is set to satisfy the following relation: fc: fc=n·fs or fc=fs/2 (n is a natural number). Thus, the discretized sensor signal includes no carrier wave, and therefore a demodulation operation which has been previously essential can be simplified.

Abstract: A power control apparatus comprising at least a coil, a contact and a manual control used to continuously energize a load when the contact is in the closed position and to de-energize the load when the contact is open. The apparatus consumes no energy while maintaining the closed or open state of the contact. Methods of operation are also described. In one aspect, the power control apparatus is embodied in the form of a standard, wall-mounted light switch.

Abstract: The invention relates to an apparatus (1) for actuating an actuator (2). The inventive apparatus (1) has an energy storage (7) for supplying the actuator (2), an integrated circuit (6) for controlling the energy supply from the energy storage (7) to the actuator (2) and an antenna device (5). The inventive apparatus (1) is special in that to the antenna device (5) an interface module (4) that is configured as a separate unit relative to the integrated circuit (6) is connected for the contactless transmission of energy for the energy storage (7) and of data for a communication with the integrated circuit (6).

Abstract: A bulk erase tool for erasing perpendicularly recorded media is provided. The bulk erase tool includes a first polarity erase magnet and a second polarity erase magnet offset from the first polarity erase magnet. In so doing, the offset between the first polarity erase magnet and the second polarity erase magnet produces a non-parallel non-vertical applied field utilized for erasing perpendicularly recorded media.

Abstract: An apparatus includes a first, stationary system, in particular a stator, and a second system which is provided for moving relative to the first system, in particular an armature, a first and second electrical reference potentials which are assigned to the first system and the second system, respectively, and a coupler for potential coupling of the two reference potentials. The coupler is used for the potential coupling of a ground of the moving system to a ground of the stationary system in order to ensure a reliable data transmission between the systems. In order to achieve a coupling with a maximal service life and requires minimal maintenance, the coupler has a field coupling component for mechanically contactless potential coupling.

Abstract: An electromagnet having at least one access port oriented perpendicularly to the electromagnet's central axis. The magnet has a conventional helical winding along its central axis. However, at some point along the length of the axis, the pitch of the helical winding is greatly increased in order to create a region with a comparatively low turn density. One or more ports are provided in this region. These ports provide access from the magnet's central bore to the magnet's exterior. A sample can be placed in the central bore near the ports. A beam traveling down the central bore, or through one of the radial ports, will strike the sample and be scattered in all directions. The ports allow access for instrumentation which is used to evaluate the scattered beam.

Abstract: The present invention provides a magnetic sensor device a first magnetic field generating means (21a, 21b) for attracting magnetic or magnetizable objects (22), e.g. magnetic particles, to a sensor surface (23) and a second magnetic field generating means (25) for, in combination with the first magnetic field, repelling magnetic or magnetizable objects (22), e.g. magnetic particles, from the sensor surface (23). The magnetic fields generated by the first and second magnetic field generating means have substantially anti-parallel directions. The present invention furthermore provides a method for attracting and repelling magnetic or magnetizable objects (22), e.g. magnetic particles, to and from a sensor surface (23).

Abstract: One or more pairs of magnet assemblages (14 and 16) are provided with magnetized segments (21-30) arranged in a Halbach-like array. The magnet assemblages (14 and 16) define a gap (18) through which magnetic data storage media (12) pass in a direction (20) across the segments (21-30). The magnetized sides (36) of the magnet assemblages (14 and 16) face each other thereby creating strong magnetic fields which degauss the magnetic data storage media (12) passing through the gap (18).

Abstract: A magnetic bearing system for use in a vacuum pump including a motor provided with a rotary blade. The magnetic bearing system including a rotary shaft rotationally holding said rotor, a motor for rotationally driving said rotary shaft, a magnetic levitation section for supporting said rotor relative to a stator through said rotary shaft in a non-contact manner, a rotation detection section for detecting a rotational speed of said rotor, a rotor-temperature detection section for detecting a temperature of said rotor; a carrier-wave generation section for supplying a common carrier wave to each of a plurality of sensors provided in said magnetic levitation section, said rotation detection section and said rotor-temperature detection section, and an A/D conversion section for sampling a sensor signal output from each of said sensors, in synchronization with said carrier wave.

Abstract: A solenoid-operated valve device is provided which includes a valve, a solenoid actuator designed to be supplied with electric power from a battery to operate on voltage substantially identical with that outputted from the battery to move the valve, and a controller working to energize said solenoid actuator. Prior to entering a main energization mode to energize the solenoid actuator to open or close the valve, the controller works to supply a low current to the solenoid actuator to create magnetic field therein to assist in energizing the solenoid actuator in the main energization mode quickly at a high speed. The controller may alternatively be designed to step-up the voltage to be applied to the solenoid actuator initially prior to entering the main energization mode.

Abstract: A method for utilizing a bulk erase tool to erase perpendicularly recorded media is provided. A bulk erase tool having a first polarity erase magnet and a second polarity erase magnet is received. An offset is provided between the first polarity erase magnet and the second polarity erase magnet, wherein the offset provides a non-parallel non-vertical applied magnetic field suitable for erasing perpendicularly recorded media.

Abstract: An electromagnet configured to contactlessly support a body includes an excitation amplifier configured to supply excitation current to the electromagnet, a carrier wave generation device, and a sensor configured to modulate the carrier wave and to output a sensor signal. An A/D conversion device is included for converting the sensor signal to a digital signal at a sampling frequency such that the frequency range of the sensor signal is either higher than 1/2 times the sampling frequency and lower than the sampling frequency, or higher than the sampling frequency and lower than 3/2 times the sampling frequency. In addition, a demodulation calculation device for demodulating the digitized sensor signal and a control device for controlling the excitation amplifier are provided.

Abstract: The invention relates to a method for applying a magnetic mark to a rotatable article (1) to be positioned, to a corresponding device and to a system (2) consisting of a device for applying a magnetic mark and a device (25) for determining the angle of rotation. In the region that comprises magnetizable material of the rotatable article to be positioned and is selected for determining the angle of rotation, a magnetic dipole is generated as a magnetic mark by a magnetic field, by means of the device for applying a magnetic mark. Said mark is used for determining the angle of rotation of the rotor.

Abstract: Described is a method and array for magnetizing a magnetizable object. The method includes the steps of (a) applying a first degaussing signal to the magnetizable object to degauss the magnetizable object and the first degaussing signal is an alternating electrical signal having a first frequency and a first amplitude; (b) applying a magnetizing signal to the degaussed magnetizable object to magnetize the magnetizable object; and (c) applying a second degaussing signal to the magnetized magnetizable object to partially degauss the magnetized magnetizable object and the second degaussing signal is an alternating electrical signal having a second frequency and a second amplitude.

Abstract: A method and apparatus for degaussing a water vessel. The invention involves the use of a light-weight reduced-size degaussing system that comprises a plurality of degaussing coils arranged in a plurality of axes. An electrical current is passed through the plurality of coils to create a degaussing field. The degaussing coils comprise a high temperature superconductor material, the coils cooled by a single-phase gaseous cryogen.

Abstract: An electrical wiring device including a plurality of independent switches and a circuit interrupter. In an aspect, two adjacent switches are provided. The user accessible portions of the switches operate in a direction parallel to the major longitudinal axis of the electrical wiring device. A protected receptacle may also be provided. The circuit protection component includes a line terminal connectable to a source of voltage, a load terminal connectable to a load, a circuit interrupter that is configured to connect or disconnect the line terminal from the load terminal, a fault detection circuit that is configured to detect at least one predetermined condition, and a trip mechanism in operable communication with the circuit interrupter to disconnect the line terminal from the load terminal upon detection of the predetermined condition.

Abstract: A coil-driving apparatus of an electro magnetic contactor is disclosed, which replaces the main units in an analog scheme with those in a digital scheme using a PWM controller of low power consumption to reduce the number of the analog components, minimize power consumption, and controls a constant voltage that flows on the coil by receiving the feedback current flowing on the coil, whereby error and defect generation rates are reduced, and deterioration and burning of components are prevented.

Abstract: In a control circuit for at least one actuator, in particular for a capacitive actuator of an injection system of an internal combustion engine, a control current can be applied to the actuator. The control circuit has an inductor, e.g., having a core and having multiple windings, the windings being designed and connected to the control circuit such that a control current flowing into the actuator and a control current flowing out of the actuator each flow through different windings of the inductor, and a magnetic flux induced in the inductor or its core by the control current flowing into the actuator and a magnetic flux induced in the inductor or its core by the control current flowing out of the actuator mutually compensate one another.

Abstract: Disclosed is an electromagnetic switching device including a number of fixed contact pieces, a solenoid-operated mechanism, a contact support which can be moved counter to restoring devices in at least one embodiment, with the aid of the solenoid-operated mechanism and on which a number of movable contact pieces are arranged, and an off stop for the contact support. A sensor is provided, in at least one embodiment, for detecting the position of the contact support while a control unit is provided which is connected to the sensor and regulates and/or controls the solenoid-operated mechanism during a switch-off process in order to decelerate the contact support before the same hits the off stop. Also disclosed is a method for operating such a switching device. The contact support, in at least one embodiment, transmits only a small momentum to the off stop, thus reducing the load applied to the involved parts. Such a switching device therefore has a longer service life than conventional switching devices.

Abstract: An active vibration insulator includes an electromagnetic actuator, a control-signals generating device, a driver, a calculator, and a judging device. The electromagnetic actuator generates vibrating forces depending on electric-current supplies. The control-signals generating device generates cyclic control signals based on cyclic pulsating signals output from a vibration generating source of a vehicle. The cyclic control signals actively inhibit vibrations generated by the vibration generating source from transmitting to a specific part of the vehicle. The driver drives the electromagnetic actuator by making the electric-current supplies variable based on the cyclic control signals. The calculator calculates an estimated transfer function composed of estimated values of a transfer function for a transfer system including the electromagnetic actuator and the driver. The judging device judges an inoperative malfunction of the electromagnetic actuator based the estimated transfer function.

Abstract: A woodworking machine including a detection system adapted to detect a dangerous condition between a person and a working portion of the machine is disclosed. The machine includes a reaction system associated with the detection system to cause a predetermined action to take place relative to the working portion upon detection of the dangerous condition. A motion detection system is adapted to detect motion of the working portion and to disable the reaction system when the working portion is not moving. The motion detection system may sense whether motion in a machine has stopped by monitoring the back emf produced on the motor leads as the motor coasts to a stop. The woodworking machine may take the form of a saw, the working portion may be a blade adapted to cut when spinning, and the dangerous condition may be a person contacting the blade.

Abstract: A magnetic bearing device includes an electromagnet for supporting a member without contact; an excitation amplifier for supplying an excitation current to the electromagnet; a carrier wave generation device for generating a carrier wave; and a sensor device for modulating the carrier wave to output a sensor signal according to a position of the member. An A/D conversion device converts the sensor signal to a digital value, and a demodulation calculation device demodulates through a digital calculation process according to the sensor signal converted to the digital value. A control device controls the excitation amplifier according to a calculation result of the demodulation calculation device.

Abstract: A switch which is magnetic pole insensitive is described. The switch includes a Hall effect sensor coupled to a threshold circuit which provides an output signal indicative of the proximity of a magnet, and hence a magnetic field, to the Hall effect sensor regardless of the orientation of the magnet to the Hall effect sensor.

Abstract: An inverter assembly including a storage compartment for multiple cables adapted to be releasably connected to the inverter. A body of the inverter assembly includes interior and exterior fins for the dissipation of heat energy.

Abstract: To provide a magnetic bearing device capable of reducing vibration by preventing a deterioration in the control of a rotor shaft due to a variation in the axial position of the rotor shaft, while performing positional control over the rotor shaft in a specific attitude with optimal magnetic force, and to a turbo molecular pump with the magnetic bearing device mounted thereto. A sensitivity storage section 281 stores therein a sensor sensitivity used in a sensor sensitivity adjustment. The sensitivity storage section 281 outputs the stored sensor sensitivity to a sensitivity switching section. The sensitivity switching section switches the sensor sensitivity according to the situation, and outputs the result to a sensor signal amplifier section.

Abstract: The arrangement and the respective display unit comprise a microprocessor, a demagnetization circuit and a switched mode power supply operating in a normal mode and in a low power mode. The microprocessor is coupled via the same output to the switched mode power supply for controlling the low power mode and to the demagnetization circuit for controlling a demagnetization operation. In a preferred embodiment, the control signal from the microprocessor provides a control for a low power burst mode, and is further combined with a power on-indicative signal via a logical AND combination for controlling the demagnetization circuit.

Abstract: A stator is constructed by winding excitation coils around respective main poles. A rotor is constructed by fixing a first rotor unit, which consists of a pair of rotor cores and a magnetic material sandwiched between the rotor cores, and a second rotor unit, which has the same construction as the first rotor unit, to a rotation shaft. The rotor is assembled to the stator to form an assembled body. The magnet material of the first rotor unit is magnetized in the axial direction by a magnetizing flux passing through a half of the assembled body in the axial direction. The magnet material of the second rotor unit is magnetized in the axial direction in an opposite polarity by a magnetizing flux passing through the remaining half of the assembled body in the axial direction.

Abstract: An image detection module comprises a base, a seat movably disposed on the base, an image detection unit on the seat, a first guide member by which the seat is joined to the base, moving relative to the base, a first coil on either the base or the seat, a first magnet on either the base or the seat and opposite to the first coil, a first metal element on either the base or the seat, corresponding to the first magnet and the first coil between the first magnet an the first metal element, and a first Hall element on either the base or the seat and adjacent to the first coil. A magnetic force is generated between the first coil, the first magnet and the first metal element by a voltage provided to the first coil, moving the seat along the first axis along the first guide element.

Abstract: The magnetic flux of a magnetic body is controlled with voltage pulses from an active voltage source. The voltage pulses are applied to a winding circuit which is magnetically coupled to the magnetic body. An electronic switch means is used to generate the voltage pulses from a d-c power supply. A control circuit receives information about the winding current, and utilizes known loop impedances to optimize the voltage pulses for optimal magnetic control. Utilizing voltage pulses rather than a continuously variable voltage source has the advantage of lower cost and improved energy efficiency for many applications. The invention may be utilized for measurement of a-c current and d-c current utilizing ordinary current transformers. The switched-voltage control that is disclosed also may be used to facilitate accurate measurement of a-c current in a self-powered manner, with the power supply for the electronics deriving its power from the current transformer secondary circuit.

Abstract: Electronic systems are described including semiconductor circuitry characterized by first signals and all-metal circuitry characterized by second signals and comprising a plurality of transpinnors. Each transpinnor includes a network of thin-film elements. At least one thin-film element in each transpinnor exhibits giant magnetoresistance. Each transpinnor includes a conductor inductively coupled to the at least one thin-film element for controlling operation of the transpinnor. Interface circuitry connects the semiconductor circuitry to the all-metal circuitry and converts between the first signals and the second signals.

Abstract: A monolithic integrated circuit arrangement containing a substrate, a functional unit formed in and/or on the substrate, and an energy supply unit, which is formed in and/or on the substrate and is coupled to the functional unit and has an inductance and a permanent magnet. The inductance and the permanent magnet are arranged such that, under a vibration on the circuit arrangement, the permanent magnet is moved relative to the inductance such that an electrical induced voltage for supplying the functional unit with electrical energy is induced by the inductance.

Abstract: An electronic control circuit for a motor vehicle starter contacter includes a management unit (26) having: first means for detecting the open or closed state of the power contact (20), and second means for regulating the power supply of the winding (18) during the starting cycle when the power contact (20) is still open after a predetermined period of time following commencement of the order for starting.

Abstract: The method according to the invention for demagnetization is effected in two separate steps. Firstly magnetically hard locations, such as weld seams, pressure locations etc., of an object to be demagnetized is pre-treated locally with high fields by way of choke coils in an alternating field. These magnetically hard locations are at least partly demagnetized by way of this. Subsequently the complete demagnetization is effected in a decisive second step. The object remains for a certain time in an alternating field. Now the alternating field is stepped down in that the current in a series oscillation circuit is stepped down in a current-controlled manner with two coils.

Abstract: A device and a method for stabilising a metallic object of magnetic material. The metallic object is transported along a transportation path or plane. The plane includes a transportation direction and is parallel to the longitudinal direction of the object therein. A sensor is arranged to sense the valve of a parameter depending on the position of the object with respect to the plane. An electromagnetic actuator is arranged to apply a magnetic force to the object in respone to the sensed position. The magnetic force has a force component directed transversely to the transportation direction and transversely to the plane.