摘要:
The present invention 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, consisting of at least one stator structure (1), at least one electrical supply coil (3), and a moving member (2), said stator structure (1) having, on the one hand, a central pole (4) running perpendicular to the direction of said travel Y and having a width Y C1 in the direction of the travel and terminating at its end in a width Y C2 that is greater than or equal to the travel Y of the moving member (2), Y C2 being greater than Y C1 , and, on the other hand, two lateral poles (5a, 5b) having widths Y L1 in the direction of the travel and terminating at their end in a width Y L2 greater than Y L1 , the lateral poles (5a, 5b) and the central pole (4) being separated by a distance Y G , the moving member (2) that is able to move relative to the stator structure (1) comprising an armature (11) supporting at least two adjacent thin permanent magnets (6, 7) each having a width Y A , the moving member (2) and the stator structure (1) delimiting an air gap E, the coil (3) having a width Y B , characterized in that the width Y L2 of the lateral poles (8) is equal to (2Y L1 +2Y B +Y C1 -2Y G -Y C2 )/2 and less than the width Y C2 of the central pole (4).
摘要:
A display module has a two-phase motor comprising a rotor (6) having N pairs of poles magnetised radially, in alternate directions, N being equal to 3 or 5, and a stator part (4) having at least two W-shaped circuits made from radial pole teeth extending inwards from a peripheral closed belt and having a coil (5) 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 additionally comprises at least one means of specific mechanical interaction (13) between the rotor and the stator, providing angular friction at a force that is substantially constant depending on the speed of the rotor (6) relative to the stator (4), and at a value lower than the torque produced by the electromagnetic interaction between the rotor and the stator.
摘要:
The invention relates in particular to a method for parameterizing a system for measuring an absolute position, said system comprising a permanent magnet, at least one probe that is mobile relative to said magnet over a given path, and a calculation means providing position information calculated on the basis of the arctangent of the ratio, to which a correction coefficient G is assigned, between the output signals of the probe, wherein said signals are pseudo-sinusoidal and squared. Said 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.
摘要:
The invention concerns a polyphase motor comprising M phases, M being equal to 2 or 3, the motor consisting of a stator part (1) excited by electric coils and by a magnetized rotor (2). The invention is characterized in that the rotor (2) 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 (1) 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.