Robert Boschgmbh

Miguel Ruiz De Larramendi

Patrick Heuser

Mercedes Herranz Gracia

Arndt Kelleter

Marcus Alexander

Sebastian Tabarelli

Paul Esse

Andre Brune

Nils Gebert

For an asynchronous machine (), in particular for use in electric vehicles or hybrid vehicles, comprising a rotor () and a stator () which surrounds the rotor (), wherein an external stator yoke () with a stator yoke height (h) is formed on the stator () and a large number of radially inwardly projecting stator teeth () of the same length are formed on the stator yoke (), wherein a stator slot () is respectively formed between adjacent stator teeth (), wherein an internal rotor yoke () is formed on the rotor () and a large number of radially outwardly projecting rotor teeth () of the same length are formed by the rotor yoke (), wherein a rotor slot () is respectively formed between adjacent rotor teeth (), wherein the asynchronous machine is of six-phase design, it is proposed that a total number (N) of stator slots, which denotes the total number of stator slots () formed on the stator (), is seventy-two.

Asynchronous machine

The invention relates to an electric asynchronous machine (), in particular an induction machine, comprising: &#x2014;a cylindrical stator () with stator teeth () on a stator yoke (), wherein a ratio between a yoke height (hy) of the stator yoke () in the radial direction and a groove height (hn) of the stator grooves () in the radial direction ranges from 1.75 to 2.5; &#x2014;a cylindrical rotor () with poles () on a rotor yoke which are defined by short-circuit windings in a rotor body (), wherein a ratio between the yoke height of the rotor body () in the radial direction and the groove height of the rotor grooves in the radial direction ranges from 2 to 2.75.

Electric machine

The invention relates to an asynchronous machine () as can be used particularly in electric vehicles or hybrid vehicles. The asynchronous machine () has a rotor () and a stator (). The asynchronous machine is designed and controlled in such a manner that it has a pole pair number p of p=3. Because of the reduced yoke saturation that can consequently be achieved, the stator yoke () can be designed with a lesser height hy, such that a ratio of the outer rotor diameter Dto the outer stator diameter Dcan assume values between 0.7 and 0.8. As a result, enlarged rotor teeth () and correspondingly enlarged rotor grooves () can be formed in the rotor (), such that electrical losses in the material in the rotor grooves () acting as the rotor coil element () are smaller in comparison to conventional asynchronous machines. The electrical losses occurring to a greater extent in the stator () compensating for this lead to a lesser warming of the stator () than would be the case with the rotor () as the stator () can be cooled by simple means. Overall, a higher continuous torque can thus be achieved with the asynchronous machine () according to the invention.

Asynchronous machine with optimized distribution of electrical losses between stator and rotor

A rotor () for an electric machine, in particular a permanently excited synchronous machine. At least one recess () is formed on the outer wall () of the receiving space () and forms a non-magnetizable space () adjacent to the lengthwise surface () of the permanent magnet (). Due to this non-magnetizable space (), iron losses in the stator teeth can be reduced in particular during operation of the electric machine in the field weakening range, which may result in a rise in efficacy of up to 3% for the electric machine.

Growing community of inventors

Ludwigsburg, Germany

Miguel Ruiz De Larramendi