Influence of Rotor Slot Shoulder Angle on the Performance of Cage Induction Motors

Abstract

Abstract:

Slot shoulder angle in the rotor semi-open slot is used for improving the slot stiffness and motor’s performance. However there are no strict criteria in choosing the angle’s degree and 30° is the most common angle used in the slot designing. In this paper, parallel slot is used as the example for discussing the influence of rotor slot shoulder angle on motor’s performance. Models of motors with different slot shoulder angles are established in time-harmonic field and precise calculations are carried out by 2D finite element method. The effect of rotor slot shoulder angle on the bar resistance and leakage inductance, considered the influence of skin effect, is emphatically investigated. And motor’s performances such as torque, current, rotor copper loss, and rotor eddy current loss are also evaluated. The result for this research could provide a reference in choosing the degree for slot shoulder angle.

Key words: AC value of impedance, slot shoulder angle, cage induction

CLC Number:

TM315

Sun Yue. Influence of Rotor Slot Shoulder Angle on the Performance of Cage Induction Motors[J]. Journal of Electrical Engineering, 2015, 10(8): 68-73.

Figures/Tables 12

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References 12

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参数	数值
额定功率/kW	1 000
额定电压/kV	10
定子外径/mm	850
定子内径/mm	540
极对数	2
定子槽数	60
转子槽数	47
铁心长度/mm	500
气隙长度/mm	2

槽肩角/（°）	直流电阻/Ω	交流电阻/Ω
槽肩角/（°）	直流电阻/Ω	额定状态	起动状态
0	3.2241e-5	3.2246e-5	7.6539e-5
10	3.2388e-5	3.2393e-5	7.6775e-5
20	3.2546e-5	3.2552e-5	7.7226e-5
30	3.2728e-5	3.2733e-5	7.7903e-5
40	3.2954e-5	3.2960e-5	7.8947e-5
50	3.3262e-5	3.3267e-5	8.0729e-5
60	3.3750e-5	3.3755e-5	8.4474e-5

槽肩角/（°）	直流漏感 /H	交流电感/H
槽肩角/（°）	直流漏感 /H	额定状态	起动状态
0	3.5518e-6	4.4196e-6	5.5222e-7
10	3.6189e-6	4.5006e-6	6.0650e-7
20	3.6902e-6	4.6238e-6	6.7135e-7
30	3.7712e-6	4.8104e-6	7.6260e-7
40	3.8706e-6	5.1031e-6	8.7335e-7
50	4.0047e-6	5.4697e-6	9.9988e-7
60	4.2097e-6	6.0457e-6	1.1738e-6