Novel rotor topology design and strength optimization of 1.1 MW high speed interior permanent magnet synchronous motor
In high-power and high-speed permanent magnet motors,carbon fiber banding is commonly used to reduce maximum rotor stress.However,the retaining sleeve may enlarge the thickness of equivalent air-gap,resulting in a decrease in motor performance.To solve this problem,a 1.1 MW,18000 r/min interior permanent magnet synchronous motor with a novel rotor topology was designed.In the structure the permanent magnet segment design was adopted,and the strengthening rib was added to disperse the stress at the magnetic bridge,so that the thickness of the retaining sleeve can be effectively reduced.At the same time,the external magnetic bridge was replaced with non-magnetic fillers to block the magnetic leakage path,so as to improve the utilization of permanent magnet.Finally,the finite element method a-nalysis results show that compared with the initial model,under the condition of the equivalent air-gap of the novel structure motor is increased by 1.5 mm,the output torque reaches 600.44 N·m,an increase of 16.86 N·m.In the meanwhile,the maximum stress of the novel rotor is reduced by 496.82 MPa,the rotor mechanical strength of the novel structure motor is significantly improved,which can provide ref-erence for the rotor topology design of high-power and high-speed permanent magnet motors.
NETL
NSTL
万方数据
