Three-phase motor

US6297573A · kind A · utility

Assignee

• SEW-EURODRIVE GMBH & CO. KG · DE

Inventors

• Jorg Roth-Stielow · Bretten, DE
• Josef Schmidt · Graben-Neudorf, DE

Key dates

• Filing date: May 16, 2000
• Grant date: Oct 2, 2001
• Expiry date: May 16, 2020

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02P2209/01
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A three-phase a.c. motor for operation with a three-phase mains supply (1), with three single- or multiple-strand windings (2u, 2v, 2w) in a star configuration (2) in which terminals (U2, V2, W2) at the neutral ends of the windings (2u, 2v, 2w) are accessible outside the set of windings (2), with an electronic switch (4) so constructed and so connected by way of switch terminals (U3, V3, W3) to the neutral-end terminals (U2, V2, W2) that the latter can be electrically connected to one another during a process of turning on and disconnected from one another during a process of turning off, and with a control circuit (5) designed to control the electronic switch (4) and connected to the latter. By integration of the electronic switch (4) and the control circuit (5) within the terminal box of the three-phase motor, both the space required and the number of electronic components can be dramatically reduced in comparison to known three-phase motors.