High torque modular dual three-phase permanent magnet motor with stator tooth offset combined with unequal turn windings

By using a modular design for stator tooth offset and unequal turns winding, the problem of slot area loss in traditional methods is solved, realizing a dual three-phase permanent magnet motor with high torque and low torque pulsation, thus improving the motor's electromagnetic performance and operating efficiency.

CN122247141APending Publication Date: 2026-06-19NANJING INST OF TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING INST OF TECH
Filing Date
2026-03-13
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Traditional tooth offset methods are insufficient in increasing the number of effective conductors in the slots of dual three-phase permanent magnet motors, resulting in slot area loss and affecting electromagnetic performance.

Method used

The high-torque modular dual three-phase permanent magnet motor design adopts stator tooth offset combined with unequal turns winding. By dividing the stator into two unequal modules and setting two sets of three-phase windings in each module, the first set of windings lags the second set by 30° in phase. Combined with the unequal number of turns design, the winding space distribution and magnetic field modulation are optimized.

Benefits of technology

It effectively suppresses cogging torque, increases average torque, reduces electromagnetic torque pulsation and core loss, and improves motor running stability and torque density.

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Abstract

This invention discloses a high-torque modular dual three-phase permanent magnet motor with stator tooth offset and unequal-turn windings. The stator is divided into two unequal modules along the circumferential direction, with slot pitch angles of 10.3° and 9.3° for modules one and two, respectively. Each module has two sets of three-phase windings, with the first set of three-phase windings lagging the second set of three-phase windings by 30° in phase. This invention enables a 36-slot / 32-pole permanent magnet motor to use dual three-phase windings by stator tooth offset, forming two modular structures with different slot pitch angles. This results in different numbers of series turns and winding arrangements for each phase winding in modules one and two. This not only does not affect the symmetry of the no-load back EMF, but also greatly improves the shortcomings of excessive cogging torque and torque pulsation in traditional tooth-offset motors. Furthermore, the arrangement of dual three-phase windings and unequal-turn windings improves the fundamental winding factor, thereby effectively increasing the average torque of the motor.
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