Patent Number: 6,297,573

Title: Three-phase motor

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.

Inventors: Roth-Stielow; Jorg (Bretten, DE), Schmidt; Josef (Graben-Neudorf, DE)

Assignee: Sew-Eurodrive GmbH & Co.

International Classification: H02H 7/08 (20060101); H02H 7/085 (20060101); H02K 11/00 (20060101); H02P 007/62 (); H02K 011/00 (); H02H 007/08 ()

Expiration Date: 10/02/2018