Commutatorless D.C. motor with three-strand full-pitched stator winding

US4577139A · kind A · utility

Assignee

• ebm Elektrobau Mulfingen GmbH & Co. · DE

Inventors

• Wilhelm Reinhardt · Schrozberg, DE
• Helmut Lipp · Assamstadt, DE

Key dates

• Filing date: Jul 27, 1984
• Grant date: Mar 18, 1986
• Expiry date: Jul 27, 2004

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02K29/08
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A commutatorless D.C. motor with cylindrical air gap, consisting of a stator with three stator winding strands displaced by 120.degree. electrical and with a permanent-magnetic external rotor with at least p=1 pairs of poles and with N=2p.times.3 winding slots in the stator as well as with at least two rotation position detectors composed of Hall generators, which switch on and off the individual winding strands depending on the rotation position of the rotor, in which connection the rotor (7) exhibits p=2 or p=4 pairs of poles, and the stator windings are full pitch, also each winding strand (3,4,5) is subdivided into w=2p winding sections, whose central axes exhibit a separation of 180.degree. electrical, viewed in the direction of rotation, and the direction of winding of the winding sections is such that at the periphery of the stator (1) alternating North and South poles, viewed in the direction of rotation, are produced by the winding sections. The rotor magnet 7 is magnetized with four poles and is provided with the cut-outs 8 of 50.degree.-60.degree.0 electrical depicted in FIG. 4.