17988102. TORQUE RIPPLE COMPENSATION WITH ROTOR POCKET NOTCHES IN MULTI-LAYER SYNCHRONOUS MACHINES simplified abstract (GM GLOBAL TECHNOLOGY OPERATIONS LLC)

TORQUE RIPPLE COMPENSATION WITH ROTOR POCKET NOTCHES IN MULTI-LAYER SYNCHRONOUS MACHINES

Organization Name

GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor(s)

William R. Jensen of Walled Lake MI (US)

Mazharul Chowdhury of Canton MI (US)

Jay Jihyun Kim of Rochester Hills MI (US)

TORQUE RIPPLE COMPENSATION WITH ROTOR POCKET NOTCHES IN MULTI-LAYER SYNCHRONOUS MACHINES - A simplified explanation of the abstract

This abstract first appeared for US patent application 17988102 titled 'TORQUE RIPPLE COMPENSATION WITH ROTOR POCKET NOTCHES IN MULTI-LAYER SYNCHRONOUS MACHINES

Simplified Explanation

The patent application discusses aspects of a synchronous electric motor, specifically a synchronous interior permanent magnet or a synchronous reluctance motor, with pockets and magnet pockets that include notches to reduce torque ripple without affecting average torque output significantly.

• Notches in the outer edges of pockets and magnet pockets, including flux barriers, can redirect magnetic flux flow to reduce torque ripple.
• Characteristics of the notches such as number, geometry, and location can be adjusted for optimal performance.
• Symmetry or asymmetry of the notches in radial and longitudinal directions of the rotor can impact motor performance.

Potential Applications

The technology described in the patent application could be applied in various industries where synchronous electric motors are used, such as automotive, industrial machinery, and renewable energy systems.

Problems Solved

The innovation addresses the issue of torque ripple in synchronous electric motors, which can lead to vibrations, noise, and reduced efficiency in motor operation.

Benefits

By reducing torque ripple, the motor can operate more smoothly and quietly, leading to improved overall performance and efficiency.

Potential Commercial Applications

The technology could be utilized in electric vehicles, HVAC systems, robotics, and other applications where synchronous electric motors are commonly used.

Possible Prior Art

Prior art related to optimizing torque ripple reduction in synchronous electric motors may include research papers, patents, or industry publications discussing similar techniques or technologies.

Unanswered Questions

How does the presence of notches impact the overall efficiency of the motor?

The patent application discusses reducing torque ripple, but it does not explicitly address how the notches may affect the efficiency of the motor as a whole. Further research or testing may be needed to determine the impact on efficiency.

Are there any limitations to the size or shape of the notches that could affect their effectiveness?

While the patent application mentions adjusting characteristics of the notches for optimal performance, it does not specify if there are any limitations to the size or shape of the notches that could impact their effectiveness in reducing torque ripple. Additional studies could explore the optimal design parameters for the notches.

Original Abstract Submitted

Aspects of a synchronous electric motor, including a synchronous interior permanent magnet or a synchronous reluctance motor, are disclosed. The outer edges of pockets and magnet pockets, including flux barriers, selectively include one or more notches at the front of the pockets. The use of these notches may redirect flow of the magnetic flux such that overall torque ripple may be reduced without significantly adversely affecting the average torque output of the motor. In some embodiments, various characteristics of the notches may be changed to achieve optimal performance including number, geometry, and location of the notches on select outer edges of the pockets. Another characteristic includes symmetry of the notches or asymmetry, whether in the radial and longitudinal directions of the rotor.