Valeo Equipements Electriques Moteur

Valeo Equipments Electriques Moteur

Mamy Rakotovao

Jean-Claude Matt

Julien Masfaraud

Khadija El Baraka

Svetislav Jugovic

Jean-Marc Dubus

Lilya Bouarroudj

Virginie Leroy

Cyril Dubuc

Jean-Claude Labrosse

Benoit Walme

Patrick Dubus

Nam-Gook Kim

Julien Mafaraud

Johnny Duarte

Rafal Pisarek

A polyphase electric motor () of a motor vehicle which includes a rotor () and a stator () surrounding the rotor and including a plurality of stator windings () around stator teeth () defined by notches () in a stator magnetic mass (). According to the invention, the motor includes a device for determining an angular position () and/or the speed of rotation of the rotor, including a plurality of magnetic field sensors () which are stationary relative to the stator. The sensors are arranged in notches () and comprise large casing surfaces extending in planes that are tangential to the stator magnetic mass, such that the sensors detect only a radial component of the magnetic field inside the stator magnetic mass.

Polyphase electric motor with device for determination of angular position and/or speed of rotation of rotor of the motor

A rotor for an electric machine comprises a central core, arms extending radially relative to the core, these arms each comprising two rims extending on either side of the arms, permanent magnets positioned inside housings that are delimited by opposing lateral faces of adjacent arms, an outer face of the core extending between adjacent arms, and the rims of the arms of the rotor. Plates made from a material more flexible than the permanent magnets are positioned between the rims of the arms and the face of the permanent magnet facing away from the axis of the rotor to hold the magnets. The plate having, in the axial direction, a height close to the height of the permanent magnets, the ratio between the width of the plate and that of the magnet being between 0.9 and 1.1, without being equal to 1.

Plates for retention of magnets

Disclosed is the selecting of the optimum characteristics of a magnetic device producing a sinusoidal signal for determination of angular position in a rotary machine. The device includes a multi-polar magnetic ring which is mobile in rotation around an axis, and creates a variable magnetic field according to an angle of rotation. In close proximity to the magnetic ring, a magnetic sensor is placed in this magnetic field, and generates the sinusoidal signal. The air gap between the sensor and ring is constituted by spacing the sensor by a distance E from the magnetic ring on a radial plane. Optimum performance is achieved when a first ratio e/E of a thickness e of the multi-polar magnetic ring in a direction which is radial relative to the air gap E is between 0.4 and 2.3. A second ratio h/e of a height h of the ring, in a direction which is axial relative to the thickness e, is between 1.5 and 8.

Magnetic device for determination of angular position in a multiphase rotary electrical machine

Growing community of inventors

Vitry sur Seine, France

Mamy Rakotovao