5 results about "Permanent magnet synchronous machine" patented technology

A flux-mnemonic permanent magnet synchronous machine (FMPMSM) includes: an annular stator having a winding; a rotor disposed concentric with the stator; and a power inverter for dispensing an excitation current and at least one current pulse. The rotor includes: at least two circumferentially magnetized adjustable permanent magnets, each permanent magnet having two poles normal to an air gap between the stator and rotor; and one or more flux adjusters adjacent to one or more magnet poles of the permanent magnets. A polarization ratio of magnetization of at least one of the permanent magnets is adjustable during operation of the FMPMSM by application of the at least one current pulse.

The invention relates to a method for controlling an electric machine, the method comprising the following steps: detecting a predetermined operating state of the electric machine while performing traction control of the electric machine; performing transition control and / or monitoring upon detection of the predetermined operating state in order to subsequently switch an active short circuit of the electric machine, comprising the following steps: generating steady-state target current values ​​to produce an active short circuit based on current input variables of the electric machine; performing rate limiting to limit the maximum rate of change of the target current values;Implementation of a feedforward control process in which the target current values ​​output by the rate limiter are converted into target voltage values, which contain at least one component from a time-dependent change in the magnetic flux of the electric machine, and output for controlling the electric machine; switching the active short circuit of the electric machine. Furthermore, the invention relates to a corresponding control device, a corresponding computer program and a corresponding storage medium.

The present invention relates to a rotor (1) of an electric machine (10), in particular a permanent magnet synchronous machine, with a rotor body (2) extending about a rotor axis (100), in particular a rotor lamination stack, which has several magnet pockets (3) for arranging magnets (5a, 5b), in particular permanent magnets, to form rotor poles (9), wherein at least one of the rotor poles (9) has a radially outer V-shaped magnet layer (12) comprising at least two V-shaped outer magnets (5b) and a radially inner V-shaped magnet layer (13) comprising at least two V-shaped inner magnets (5a), wherein in the respective rotor pole (9) at least one separate pole intermediate segment (6) is formed in the radial direction (200) between the outer magnet layer (12) and the inner magnet layer (13), which is formed from a soft magnetic material,in particular a laminated core or a soft magnetic compound component, wherein the respective rotor pole (9) comprises a pole center axis (9a) and two pole halves (9b) provided on both sides of the pole center axis (9a), characterized in that in the respective rotor pole (9) two separate pole intermediate segments (6) are provided between the outer magnet layer (12) and the inner magnet layer (13), which are arranged separately from each other in two pole halves (9b).

Vector control method for a synchronous machine, in particular a permanent magnet synchronous machine, in which Q-axis and D-axis setpoint currents (Iq, Id) are determined by respective assignments (5, 5A) that define a flux linkage torque (M&PSgr;) and a setpoint flux strength (&PSgr;Tgt_MTPL) with the Q-axis setpoint current and D-axis setpoint current, respectively.The D-axis target current (Iq, Id) is determined by linking the flux linkage torque (M) to a difference between a target torque (MTgt) and an iron loss torque (MIron), wherein the assignments (5, 5A) for determining the Q-axis target current (Iq) and the D-axis target current (Id) disregard a voltage variation of a voltage to be applied to the stator windings of the synchronous machine and the voltage variation is previously regulated or compensated by adjusting the target flux strength (Tgt_MTPL), characterized in that the voltage variation is regulated or compensated on the basis of a flux strength difference (Error) between a maximum flux strength (Max) and a current flux strength (ctrl_req).

The present invention relates to linear permanent magnet synchronous machines equipped with a device for minimizing the longitudinal edge effect. Intrinsically, this phenomenon gives rise to several limitations, such as: (i) a fairly marked amplification of the tooth force, which affects the quality of the force developed, (ii) an imbalance of the fluxes cut by the phases, resulting in unbalanced electromotive forces, and (iii) a local increase in transverse magnetic forces, which generates a vibration of the slider and annoying acoustic noise. The present invention proposes a device for minimizing the longitudinal edge effect in the case of long-stroke machines, whether tubular or planar in topology. It consists of two laminated ferromagnetic pieces having an "L"-shaped cross-section, mounted near the ends of the stator ferromagnetic circuit. Such a device allows for the collection of a portion of the flux generated by the slider poles located at the stator ends and its injection into the extreme stator teeth. The shape and location of these components are determined using a numerical dimensioning procedure. The proposed device improves the performance of long-stroke permanent magnet linear synchronous machines. Their integration into various sectors, such as energy, mobility, and robotics, is at stake.