Moving Magnet Technologies (s.a.)

Moving Magnet Technologies

Moving Magnet Technologies (mmt)

Moving Magnet Technologie Sa

Mmt Sa

Sonceboz Sa

Matsushita Electric Works, Ltd.

Societe Industrielle De Sonceboz Sa

Societe Industrielle De Soncebox, S.a.

Societe Industrielle De Soncez, S.a.

Daniel Prudham

Claude Oudet

Pierre Gandel

Didier Frachon

Masao Tanahashi

Yasuo Ibuki

Ryo Motohashi

Guillaume Loussert

Gérald Masson

Toyokatsu Okamoto

Jean-Daniel Alzingre

Hidetoshi Amaya

Takio Maekawa

Eric Rondot

Bruno Cavallier

Didier Catellani

Daniel Dietz

Didier Angleviel

Thibaut Richard

Pierre-Daniel Pfister

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 Rand two sides defining an alpha angle, the vertex of which is located on a radius R. The ratio R/Ris substantially equal to (1+/&#x2212;0.26/N), and the alpha angle is between 110 and 135&#xb0;.

Three-phase electric motor with a low detent torque

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.

Indicator device of an instrument panel with a complex planar movement

The invention concerns a polyphase motor comprising M phases, M being equal to 2 or 3, the motor consisting of a stator part () excited by electric coils and by a magnetized rotor (). The invention is characterized in that the rotor () has a disc-shaped magnetized part with R pairs of alternately poles magnetized in alternating directions in the thickness, R being equal to n*(M+1) or 5*n, and said stator part () has S poles, some of which excited at least by an electric coil, S being equal to 8*n, for even M, and 9*n for odd M, n being an integer not less than 1.

Two-or three-phase polyphase motor with R pairs of poles and a stator with S trapeziodal shaped poles

The invention relates to a gear motor including a multiple-phase electric motor formed by a stator portion excited by electric coils and by a rotor having N pairs of poles radially magnetised in alternating directions, the stator portion including two angular sectors alpha-and alpha-with respective radii Rand R, and wide teeth and narrow teeth radially extending from an annular crown, characterized in that the wide teeth have a width higher than or equal to twice the width of the narrow teeth, in that the notch width is higher than the width of a narrow tooth, in that the angular sector alpha-is lower than 220&#xb0; and includes all the coils, and in that the ratio R/Rranges from 1.2 to 2.

Gear motor including a compact multiple-phase electric motor

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.

Polyphase electric motor especially for driving pumps or ventilators

The invention relates to a position sensor which is intended, in particular, for detecting a steering column torsion. The invention consists of: a first magnetic rotor structure () comprising a plurality of radially-oriented magnets; a second stator structure comprising two rings () which extend into axially-oriented overlapping teeth (); and a third fixed collector structure () comprising two flux-closing parts which define at least one air gap in which at least one magneto-sensitive element is placed. The invention is characterized in that the flux-closing parts and the stator rings () define therebetween a constant collection surface that is independent of the relative radial position of the two structures.

Position sensor which is intended, in particular, for measuring steering column torsion

A linear actuator includes a brushless polyphase synchronous electric motor having a stator and a rotor. The rotor acts on a control element via a driver which can transform the rotation movement thereof into a linear movement over several rotations. Preferably, the inventive actuator comprises elastic and/or magnetic return device which can systematically return the control element to a reference position when the power supply to the motor is cut. The motor has a position detection device which, together with an electronic control unit, is used for the automatic control and regulation of the position of the rotor and, therefore, the control element.

Linear actuator comprising a brushless polyphase electric motor

A multiphase motor includes a fixed part or stator energized by electric coils and a mobile part or rotor including N pairs of poles radially magnetized in alternate directions, N being not less than 4 while being other than a multiple of 3, and the stator including P&#xd7;9 identical poles spaced apart by 40&#xb0;/P, the stator poles being assembled consecutively by three so as to define a phase with a W-shaped circuit, assembling three consecutive stator poles, the central stator pole bearing the winding of the phase. At least one element for detecting the position of the rotor is arranged in a common stage with the stator poles, in a housing substantially equidistant between two consecutive stator poles not belonging to a common phase.

Polyphase motor

A stop-detection method intended for a multi-phase synchronous geared motor that is controlled in a stepping mode, which measures the sum of the currents circulating in each of the N phases of the geared motor. In the method the stop detection threshold is calculated in relation to the change in the sum of the currents.

Stepper motor stop and stalling detection method, and stop-detector-equipped stepper motor

An angular-position magnetic-sensor device includes at least one stator and one rotor. A space between said stator and said rotor, defining over substantially 360&#xb0;, is a main air gap including at least two movable magnetic poles of alternating polarities. The stator is provided with at least one secondary air gap in which there is placed at least one magnetosensitive element. The stator is composed of two pole shoes having angular widths that are substantially equal to 120&#xb0; and 240&#xb0; respectively, and the two magnetic poles each have an angular width substantially equal to 120&#xb0;.

Angular position magnetic sensor device

An electric actuator including at least a first P-phase automatically-switched brushless synchronous motor, P being an integer ranging between 1 and 6, and N pairs of poles at the rotor, N being an integer not less than 1. The actuator also includes a position sensor outputting signal to control an electronic circuit controlling the motor. The rotor of the motor drives a gear ratio reducing mechanism. The position sensor is coupled to the reduction unit output shaft to measure the absolute angular position of the reduction unit output shaft. The electronic circuit includes a circuit sequentially controlling the current of each of the phases producing automatic switching of powering sequences of the phases on the basis of the absolute position of the reduction unit output shaft.

Motor-reduction unit switched on an absolute position signal

The invention concerns a position sensor, designed in particular for detecting a steering column torsion, consisting of a first magnetic structure including a plurality of magnets and a second magnetic structure including two ferromagnetic rings () having a plurality of teeth () and defining an air gap wherein is placed at least a magneto-sensitive element (), the two magnetic structures being respectively integral with two parts in relative rotation. The invention is characterised in that the two ferromagnetic rings () are nested and have each a substantially tubular part forming axially oriented teeth () connected by a flux-closing zone (), the detecting air gap being delimited by said flux-closing zones.

Position sensor, designed in particular for detecting a steering column torsion

An air conditioning valve actuator for a motor vehicle operating on an electric step motor with a permanent magnet capable of delivering mechanical power at least equal to 50 mW, and a reduction unit for decreasing the amplitude of the angular pitch and increase the output torque. The motor is defined by the following relationship: 10&#x3c;&#x3b3;/R&#x3c;, wherein: &#x3b3; is the torque constant, proportional to the magnet volume and, Ris the characteristic coefficient of the volume of copper and the length of the average turn of the coils, in which R=&#x3c1;.Lsp/(Scu.&#x3c3;), &#x3c1; being the resistivity of copper, Lsp being the length of the average turn of a coil, Scu being the copper section of a coil and &#x3c3; the filling coefficient of a coil. A controller is cooperative with the motor power supply enabling to accelerate gradually the frequency of the supply of the windings.

Air conditioning valve actuator for a motor vehicle

A method for setting an electric motor, which includes, during a non-powering sequence of at least one of the motor phases, measuring on a predetermined time window, the induced voltage (Ti) in the non-powered phase and in comparing its mean value to a threshold value (Ts) to stop powering of the motor on the current sequence if the measured mean value is less than the threshold value.

Method for setting a polyphase electric stepper motor

This invention relates to a position sensor featuring a stator defining an air gap inside of which a mobile magnet integral with a coupling shaft moves. The sensor features a Hall probe for measuring the variation of the induction in an air gap. The stator is formed of a first stationary part and a second part which is either stationary or mobile, the two parts defining between them a main air gap in which the part of the mobile element moves. The mobile element exhibits at least two adjacent thin parts magnetized crosswise in alternate directions, the magnetized parts being made of a material exhibiting in the entire working area a practically linear demagnetization characteristic and reversible permeability close to that of the air. The stationary part exhibits at least two secondary air gaps approximately perpendicular to the main air gap in which the mobile element moves. The Hall probe is housed in one of the secondary air gaps. The L/E ratio is greater than 6, L designation the width of a magnetic pole and E designating the width of main air gap.

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Thise, France

Daniel Prudham