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Electric machine with noise-reducing rotor notches

A rotor, notch technology applied in the field of improved rotor design, which can solve the problem of reducing overall machine performance and operating efficiency

Pending Publication Date: 2021-06-11
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such skewing techniques can have the undesired effect of reducing overall machine performance and operational efficiency

Method used

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  • Electric machine with noise-reducing rotor notches
  • Electric machine with noise-reducing rotor notches
  • Electric machine with noise-reducing rotor notches

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0061] Referring to the drawings, wherein like reference numerals refer to the same or similar components throughout the several views, an electrified powertrain 10 is schematically depicted at figure 1 In, for example, used on the exemplary motor vehicle 11. The powertrain 10 includes a rotating electrical machine 12 having a rotor assembly 14A and a stator 16 . When stator 16 is energized, rotor assembly 14A applies motor torque (arrow T M ) is supplied to a transmission ("T") 20, eg, a step-gear automatic transmission. Although omitted for simplicity of illustration, electrified powertrain 10 may also include an internal combustion engine configured to generate engine torque. When so equipped, the motor torque from the motor 12 (arrow T M ), the resulting engine torque is selectively provided to the transmission 20 .

[0062] To reduce the target noise, vibration, and harshness ("NVH") order in the electric machine 12, the peripheral outer diameter surface 30 of the rot...

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PUM

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Abstract

A rotor assembly for an electric machine, e.g., of an electrified powertrain, includes a rotor having inner and outer diameter surfaces, and a rotor shaft connected to and surrounded by the rotor. The rotor has equally-spaced rotor magnetic poles each having a quadrature-axis ("q-axis") and a pair of direct-axes ("d-axes"). At each of magnetic pole of the rotor, the rotor defines at least three arcuate notches, including a center notch bisected by the q-axis and a pair of additional arcuate notches symmetrically flanking the center notch. The rotor may include embedded permanent magnets, which may be arranged in a dual V-shaped configuration. Each additional notch may be positioned within a sweep of a top-layer opening angle of the magnets. The center notch and / or the pair of additional notches may define tangentially-continuous fillets which smoothly transition the notch into the outer diameter surface.

Description

Background technique [0001] Electric traction motors, generators and motor-generator units are collectively referred to in the art as rotating electrical machines. In a typical radial flux machine, a cylindrical stator circumscribes a cylindrical rotor, where the stator and rotor are separated a short distance from each other by a radial air gap. The equally spaced stator teeth project radially inwardly towards the outer diameter surface of the rotor, wherein adjacent stator teeth are separated from each other by respective stator slots. Each stator slot is filled with wire or solid bar segments to thereby form a set of stator windings. In a multi-phase embodiment of the electric machine, an AC input voltage is applied to the stator windings via corresponding phase leads. Thereafter, the energized stator produces a rotating stator magnetic field. [0002] In Internal Permanent Magnet ("IPM") motors, the individual laminated layers forming the core structure of the rotor emb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/27
CPCH02K1/2766H02K2213/03H02K29/03Y02T10/64H02K1/24H02K7/006H02K1/276H02K1/165
Inventor 张鹏S·赫M·C·缪尔
Owner GM GLOBAL TECH OPERATIONS LLC