Unlock instant, AI-driven research and patent intelligence for your innovation.

Permanent-magnet synchronous machine with reduced torque ripple

A technology of synchronous motors and permanent magnets, applied to synchronous motors with stationary armatures and rotating magnets, synchronous machine parts, magnetic circuits, etc., can solve problems such as attenuation or elimination

Active Publication Date: 2009-12-30
SIEMENS AG
View PDF1 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This 60% slope of the slot pitch Tn in combination with 85% pole coverage results in complete attenuation or elimination of not only the 5th but also the 7th harmonic
The combination of a slope of 3 / 7×Tn with a pole coverage of about 80% also leads to a complete attenuation or elimination of not only the 5th but also the 7th harmonic

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Permanent-magnet synchronous machine with reduced torque ripple
  • Permanent-magnet synchronous machine with reduced torque ripple
  • Permanent-magnet synchronous machine with reduced torque ripple

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The embodiments described in detail below depict preferred embodiments of the invention.

[0021] exist figure 1 A PM-synchronous machine is shown in cross-section in . The stator 1 has twelve poles 2 . The rotor 3 in the interior of the stator 1 has eight poles, which are represented in this view by eight permanent magnets 4 .

[0022] figure 2 show figure 1 An enlarged partial view of . It can again be seen here that the stator 1 has its toothing 2 and the rotor 3 has its permanent magnets 4 . The teeth 2 of the stator 1 are wound by coil windings 5 ​​, not further shown. However in particular by figure 2 Pole gap pl can also be identified. This pole gap can be quantified by the angle along the circumference.

[0023] In order to reduce the torque ripple according to the invention, in addition to a specific dimensioning of the pole gap, the magnets are also given a specific inclination or segmenting. This segmentation of the magnets in image 3 is shown w...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The design freedom tends to increase under small torque ripple when designing a three-phase PN-synchronous machine with a number of holes q equalling to [1 / 2], so a corresponding synchronous machine is provided. In a three-phase permanent-magnet synchronous machine, a pole gap and a skew of permanent magnets on the rotor are designed such that oscillating torques which are caused by the fifth and seventh harmonics of the stator field and of the rotor field are mutually reduced. In particular, the skew can be chosen as a function of the pole gap, such that the majority of the respective oscillating torques is neutralized. This results in minimal torque ripple.

Description

technical field [0001] The invention relates to a permanently magnet-excited synchronous machine, which is designed for three-phase operation. The synchronous motor has: a stator in which each tooth is surrounded by a coil winding, and the stator has the number of slots q=1 / 2; and a rotor on which permanent magnets are arranged, the permanent magnets have The pole gap in the direction and the slope relative to the axial direction. Background technique [0002] A three-phase PM-synchronous motor (permanent magnet excited) with a stator having a coil winding around each tooth and having a number of slots q=1 / 2 has a torque ripple, in particular Caused by the 5th and 7th harmonics of the stator and rotor fields. Here, the number of slots corresponds to three times the number of stator slots N1 divided by the number of poles 2p, ie q=N1 / (3×2p). Torque fluctuations also arise, for example, if the 5th harmonic of the rotor field couples with the 5th harmonic of the stator field...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02K21/16H02K21/02
CPCH02K21/16H02K1/278H02K2201/06H02K29/03
Inventor 乌多·加斯曼罗尔夫·福尔默迈克尔·察斯特罗
Owner SIEMENS AG