Moving Magnet Technologies (MMT) Patent applications |
Patent application number | Title | Published |
20150323908 | MECHATRONIC ASSEMBLY FOR DRIVING AN EXTERNAL MEMBER USING A BRUSHLESS MOTOR AND A SIMPLE ASSEMBLY OF ELECTRONIC COMPONENTS - The present disclosure relates to a mechatronic assembly for positioning a member including a control unit and an actuator, the control unit including a control algorithm and a power bridge, the algorithm controlling the power bridge, the power bridge outputting a two-wire electric signal, the actuator including a polyphase brushless electric motor having N phases (N being or higher), binary probes for detecting the position of the rotor of the motor, and power switches suitable for supplying the N phases of the motor from the two-wire electric signal, and states of the power switches is controlled directly by a signal emitted by the detection probes. | 11-12-2015 |
20150263572 | OPTIMIZED ELECTRIC MOTOR WITH NARROW TEETH - The present disclosure relates to a mono- or polyphase electric motor including a stator carrying at least three coils and consisting of 12×N straight teeth extending radially, N being an integer greater than or equal to 1, and of an equal peak divergence alpha, measured at their end from the centre of the motor, and a rotor exhibiting P pairs of magnetized poles such that P=5+2×R, P being a non-multiple of three, R being an integer greater than or equal to 0, alpha lying between 360°(12×N)/3 and 360°(12×N)/2. | 09-17-2015 |
20150225983 | SHOCK-RESISTANT MOTORIZED LOCKING DEVICE - A locking device includes a mobile locking member, movement of which can be prevented by a blocking member interacting with a motorized lever, where the motorized lever is capable of rotational movement about an axis with respect to the supporting structure, the centre of gravity of the lever lying on the axis, the lever being kept in a determined stable position and without rigid mechanical contact of the lever with the supporting structure apart from its axis of rotation. | 08-13-2015 |
20150048694 | COMPACT DIRECT-DRIVE ACTUATOR GENERATING A CONSTANT FORCE - The present disclosure relates to an electromagnetic actuator of the type producing a force due to the current that remains substantially constant over the entirety of its useful travel Y and that has a low force in the absence of current, including at least one stator structure, at least one electrical supply coil, and a moving member, the stator structure having, on the one hand, a central pole running perpendicular to the direction of the travel Y and having a width Y | 02-19-2015 |
20140283732 | DISPLAY MODULE FOR AN INSTRUMENT PANEL WITH FLUID MOVEMENT - A display module has a two-phase motor which includes a rotor including N pairs of poles magnetised radially, in alternate directions, N being equal to 3 or 5, and a stator part including at least two W-shaped circuits made from radial pole teeth extending inwards from a peripheral closed belt and including a coil on a central leg of the W, said W-shaped circuits being arranged in such a way that when the central tooth of one of the W-shaped circuits is positioned facing a rotor magnetic transition, at least one central tooth of another W-shaped circuit is positioned facing a rotor magnetic pole. Said display module additional includes at least one specific mechanical interaction (between the rotor and the stator, comprising angular friction at a force that is substantially constant depending on the speed of the rotor relative to the stator, and at a value lower than the torque produced by the electromagnetic interaction between the rotor and the stator. | 09-25-2014 |
20140203669 | COMPACT POSITIONING ASSEMBLY COMPRISING AN ACTUATOR AND A SENSOR BUILT INTO THE YOKE OF THE ACTUATOR - A positioning assembly includes a position sensor and a magnetic actuator, the actuator including a stator assembly formed of at least one ferromagnetic stator bearing at least one electric power supply coil and a yoke able to move relative to the stator assembly, the actuator having a geometry that is of revolution or periodic about an axis referred to as the main axis passing through the yoke, the sensor having at least one permanent magnet secured to the yoke and at least one magneto-sensitive probe that is fixed in relation to the magnet and able to measure the amplitude or direction of the magnetic field emitted by the magnet. The yoke has an interior recess including the main axis of the actuator, and the magnet is positioned inside the recess and secured to the yoke. | 07-24-2014 |
20130179117 | POSITION SENSOR - The disclosure relates in particular to a method for parameterizing a system for measuring an absolute position, the system including a permanent magnet, at least one probe that is mobile relative to the magnet over a given path, and a controller providing position information calculated on the basis of the arctangent of the ratio, wherein a correction coefficient G is assigned, between the output signals of the probe, wherein the signals are pseudo-sinusoidal and squared. The method includes an optimization operation that involves selecting the value of the coefficient G that minimizes the errors of the measurement system resulting from the pseudo-sinusoidal character of the signals output from the probe. | 07-11-2013 |
20130169270 | MAGNETIC MULTI-TURN ABSOLUTE POSITION DETECTION DEVICE - The disclosure relates to a magnetic device for detecting the absolute position of an input shaft capable of rotating more than 360°, the device including a main magnetic sensor, a motion reducer, and a secondary magnetic sensor, wherein the main magnetic sensor is connected to a rotor, measures the rotation of the shaft for ranges of angles of less than 360°, and includes a main magnet, the motion reducer converts the rotation of the shaft into a reduced rotation, the maximum amplitude of which is equal to no more than 360°, and the secondary magnetic sensor measures the reduced rotation and includes a secondary magnet. According to the disclosure, the secondary magnet is arranged between the upper and lower planes of the main rotor, and the main magnet has P pairs of poles, where P is greater than 1. | 07-04-2013 |
20130118398 | INDICATOR DEVICE OF AN INSTRUMENT PANEL WITH A COMPLEX PLANAR MOVEMENT - The disclosure relates to an indicator device that can be used on an instrument panel comprising two electric motors, two concentric shafts, a visual information member moved in translation by one of the shafts in a transverse direction relative to the axis of rotation of the shaft, and a guide member that is rotatably linked to the other shaft, rotates the visual information member with itself, and guides the visual information member in translation in the transverse direction. According to the disclosure, the two shafts are concentric, the visual information member is self-supporting, and the visual information member is longer than the guide member in the transverse direction. | 05-16-2013 |
20130057258 | POSITION SENSOR USING A MOVEABLE FERROMAGNETIC ELEMENT - The invention relates to a contactless magnetic sensor for detecting a linear or angular position, comprising a moveable ferromagnetic element ( | 03-07-2013 |
20120262162 | Bidirectional Magnetic Position Sensor Having Field Rotation - The disclosure relates to a magnetic position sensor in at least two directions, the sensor including at least one magnetized element and a probe including at least two magneto-sensitive elements located substantially on the same point and each measuring one of the components of the magnetic field generated by the magnetized element, the magnetized element being movable relative to the magneto-sensitive elements. The probe includes at least one processing circuit capable of carrying out angle and module calculations on the basis of algebraic combinations of the components of the magnetic field and providing at least two independent signals representing the position of the movable element along, respectively, one and the other of the two directions. According to the disclosure, the magnetization vector of the magnetized element is variable in relation to the normal vector on the surface of the magnetized element that is placed opposite the probe in at least one of the dimensions of the magnetized element so as to define a single position of the probe in relation to the magnetized element. | 10-18-2012 |
20120161755 | ANGULAR OR LINEAR MAGNETIC POSITION SENSOR NOT SENSITIVE TO EXTERNAL FIELDS - The invention relates to an angular or linear magnetic position sensor that comprises a mobile member including at least one magnet ( | 06-28-2012 |
20120146627 | MULTI-PERIODIC ABSOLUTE POSITION SENSOR - The disclosure relates to a magnetic position sensor including at least one permanent magnet. The disclosure also relates to a magnetic device for detecting a torque between a first shaft and a second shaft that are connected via a torsion bar. The aim of the disclosure is to provide a device for determining the multi-periodic absolute position of a magnetized unit. The subject of the disclosure is therefore a magnetic position sensor including at least the following: a magnetized unit, a first magnetosensitive probe and a second magnetosensitive probe. The second magnetosensitive probe is capable of measuring a number of complete rotations of the magnetic field in an absolute, incremental and reversible manner so as to determine a second datum relating to the position of the magnet, whether or not this second magnetosensitive probe is powered. The sensor further includes a module for calculating the absolute position of the magnet on the basis of the first and second data coming from the first and second probes respectively. | 06-14-2012 |
20120104905 | THREE-PHASE ELECTRIC MOTOR WITH A LOW DETENT TORQUE - The disclosure relates to a three-phase electric motor that uses high magnetic energy permanent magnets and that has a low detent torque. The motor consists of a rotor with N pairs of poles and of a stator portion with teeth extending radially from an annular gear. The teeth have windings and the ends thereof comprise an arc of circle, the middle of which is located on a radius R | 05-03-2012 |
20110267040 | LINEAR OR ROTARY POSITION SENSOR WITH A PERMANENT MAGNET FOR DETECTING A FERROMAGNETIC TARGET - The disclosure relates to a contactless magnetic sensor for measuring the angular or linear movement of a ferromagnetic target. The purpose of the disclosure is to make a position sensor having reduced dimensions and capable of detecting a piece of position information as soon as the sensor is powered without degrading the performance thereof. To this end, the disclosure relates to a mobile sensor that includes at least one permanent magnet, at least one ferromagnetic member at least one magnetically sensitive member, the permanent magnet having an upper surface opposite the ferromagnetic target, wherein the permanent magnet has a substantially cylindrical or parallelepiped shape and includes a cavity, the ferromagnetic member being arranged inside the cavity and the magnetically sensitive member being arranged inside the cavity above the ferromagnetic member and below the upper surface of the magnet. | 11-03-2011 |
20110254543 | MAGNETIC POSITION SENSOR WITH FIELD DIRECTION MEASUREMENT AND FLUX COLLECTOR - The present disclosure relates to a magnetic position sensor with field direction measurement and a flux collector. The disclosure proposes to measure two magnetic induction components at one and the same point, harmonizing the amplitude of the two magnetic induction components using flux collectors so as to have a ratio of the amplitudes of these two components close to one. For this purpose, the disclosure provides a contactless position sensor including at least one permanent magnet, emitting a magnetic field, at least one detection element sensitive to the direction of the magnetic field, and at least one pair of flux collectors, the permanent magnet being capable of moving in a direction of displacement and having a direction of magnetization that can be continuously varied according to the direction of displacement. Each flux collector has at least one portion, provided with an end, extending substantially along the direction of displacement of the magnet. The ends of a pair of flux collectors define a gap oriented along the direction of displacement of the magnet. The detection element is positioned outside the gap and substantially equidistant from the ends. | 10-20-2011 |
20100231205 | POSITION SENSOR WITH VARIABLE DIRECTION OF MAGNETIZATION AND METHOD OF PRODUCTION - A magnetic sensor of rotary, linear, or curvilinear displacement using at least one permanent magnet and at least one magnetosensitive element, which can move with respect to one another. The magnet exhibits a direction of magnetization that varies continuously along the direction of displacement, with the exclusion of a diametral magnetization in the case of a rotary sensor. | 09-16-2010 |
20100045275 | ROTARY OR LINEAR POSITION SENSOR HAVING AVARIABLE MAGNET PROFILE - The invention relates to a magnetic angular or linear sensor including at least one permanent magnet defined in a cylindrical (r, Q & z) or Cartesian (x, y & z) coordinate system and at least two magneto-sensitive elements, in which the magnet can move in relation to said two magneto-sensitive elements. The invention is characterized in that at least one dimension of the magnet varies as a non-constant function and in that the magnetization of the magnets is oriented in a single direction, i.e. x, y or z in the case of a magnet defined in a Cartesian coordinate system or r, Q or z in the case of a magnet defined in a cylindrical coordinate system. | 02-25-2010 |
20090174280 | POLYPHASE ELECTRIC MOTOR ESPECIALLY FOR DRIVING PUMPS OR VENTILATORS - A polyphase motor, for example for applications for driving pumps or ventilators in the automobile industry, including a stator part excited by electric coils and a rotor exhibiting N pairs of poles that are magnetized radially in alternate senses, the stator part exhibiting wide teeth and narrow teeth extending radially from an annular ring. The wide teeth carry the coil windings and the distance between a wide tooth and a narrow tooth is greater than the width of a narrow tooth. | 07-09-2009 |
20080314164 | Short Stroke Magnetic Position Sensor, in Particular for Measuring a Steering Column Twist - A position sensor, which can detect a steering column twist of a first magnetic rotoric structure including a plurality of radially oriented magnets and a second statoric structure including two concentric gear rings extended by radially oriented teeth. The rotoric structure is substantially disc-shaped and includes a ferromagnetic head supporting the plurality of magnets, the statoric structures are provided with interleaving teeth and the position sensor includes a third collector structure including two flow closing parts, one of which is fixed, and which define at least one air gap in which at least one magnetosensitive element is arranged. | 12-25-2008 |
20080284261 | Quick-Action Bistable Polarized Electromagnetic Actuator - The invention relates to an electromagnetic actuator comprised of a mobile assembly, a fixed ferromagnetic stator assembly, at least one electric field coil, and of at least one permanent magnet, having two stable positions of equilibrium without current at its ends of travel. The invention is characterized in that the mobile assembly has two distinct ferromagnetic armatures placed on both sides of the stator assembly and each forms, together with the stator assembly, at least one magnetic circuit, and is characterized in that the permanent magnet magnetically cooperates with one of the other ferromagnetic mobile parts in a stable position of equilibrium without current at the end of travel. | 11-20-2008 |