Steady-State Performance of a Novel Dual-Capacitor Three-Phase Induction Motor in Single-Phase Operation Mode
Zhao Guoxin1, Cui Xiaoyuan1,2, Bai Haonan1, Chen Dezhi1, Zhang Peng1
1. School of Electrical Engineering Shenyang University of Technology Shenyang 110870 China; 2. China Energy Construction Group Liaoning Electric Power Survey & Design Institute Co. Ltd Shenyang 110179 China
Abstract：Single-phase induction motors are powered by a single-phase AC power supply. The air gap field of a single-phase asynchronous motor is an elliptical rotating field that includes a negative sequence rotating field, which causes the motor to produce a braking torque during operation. As a result, the motor's output torque and efficiency are reduced. Generally, applying sinusoidal windings in single-phase motors results in low utilization of the motor stator slot area. Single-phase motors have low efficiency, large size, and high-temperature rise. By connecting appropriate capacitors to the three-phase induction motor windings, the three-phase induction motor can be supplied by a single-phase AC power. This paper proposes a novel windings and capacitors connection method, where the windings of the three-phase induction motor are connected to two capacitors. The connection circuit between capacitors and the three-phase windings for the new single-phase operation motor is given. Then, the phasor diagram about the voltages and the currents is derived. The positive-sequence and negative-sequence equivalent circuits are established. Based on the symmetrical component method, the symmetrical operation condition is analyzed, and the optimal matched capacitors are obtained. Subsequently, the calculation method of motor performance for the new single-phase operation motor in a steady state is investigated. The proposed scheme applies to a standard 550 W three-phase induction motor (Y2-801-4). The influence of the capacitance on motor performance is investigated, and the optimal two capacitances are determined. According to the FEM analysis, currents in three-phase windings are almost balanced, and the distribution of the magnetic field is rational. The air-gap flux density of the new single-phase motor is approximate to the original three-phase induction motor. The performance tests under three-phase and single-phase operation conditions are carried out. The three winding currents during single-phase operation is almost symmetrical, which agrees with the theory. The efficiency, power factor, and maximum torque are 70.2%, 1, and 5.8 N·m, respectively. The efficiency is slightly lower than the three-phase motor (71.8%), and the power factor is far higher than the three-phase motor (0.75). The temperature rise of the two operation modes is 72.6 K and 69.8 K, respectively. The temperature rise of the single-phase operation is slightly higher, but it can satisfy the operation requirement. The locked-rotor torque is 1.9 N·m, and the locked-rotor torque ratio is 0.52. The locked-rotor torque is smaller than the three-phase motor and much bigger than the standard single-phase induction motor with an operating capacitor (YY8014, 550 W, the locked-rotor torque is 1.3 N·m, locked-rotor torque ratio is 0.35). Compared with the YY8014, the efficiency is increased by 6%, the current is reduced by 15%, and the volume of the effective materials is decreased by 17%. The following conclusions can be drawn. The proposed capacitor connection method is practical. The experiments verify the new scheme and the analysis process. The new single-phase motor's performance is approximate to the original three-phase motor and much better than the common single-phase motor.
[1] 鲍晓华, 明帅, 陈国玮, 等. 变频驱动下双斜槽转子感应电机径向电磁力特性分析[J]. 电工技术学报, 2023, 38(10): 2613-2624. Bao Xiaohua, Ming Shuai, Chen Guowei, et al.Analysis of radial electromagnetic force characteri- stics of inverter drive double skewed rotor induction motor[J]. Transactions of China Electrotechnical Society, 2023, 38(10): 2613-2624. [2] 陈鹏, 谢颖, 李道璐. 感应电机定子匝间短路故障温升特性研究[J]. 电工技术学报, 2023, 38(18): 4875-4888. Chen Peng, Xie Ying, Li Daolu.Research on the temperature rise characteristics of induction motors with stator inter-turn fault[J]. Transactions of China Electrotechnical Society, 2023, 38(18): 4875-4888. [3] Um D Y, Park G S.Determination scheme of stator parameters for making rotating fields circular in a single-phase induction motor[J]. IEEE Transactions on Magnetics, 2020, 56(1): 7502105. [4] Chen Bin, Xiao Yong, Shi Jinfei, et al.Study on the characteristics of electromagnetic force of single- phase concentrated winding induction motor[C]//2023 26th International Conference on Electrical Machines and Systems (ICEMS), Zhuhai, China, 2023: 2606-2611. [5] Badr M A, Alolah A I, Abdel-Halim M A. A capacitor start three phase induction motor[J]. IEEE Transa- ctions on Energy Conversion, 1995, 10(4): 675-680. [6] 吴新振, 王祥珩. 异步电机不对称运行时电容值的确定[J]. 中国电机工程学报, 2003, 23(8): 125-129. Wu Xinzhen, Wang Xiangheng.Run capacitance of the induction machine under unbalanced operation[J]. Proceedings of the CSEE, 2003, 23(8): 125-129. [7] Smith O J M. High-efficiency single-phase motor[J]. IEEE Transactions on Energy Conversion, 1992, 7(3): 560-569. [8] Chan T F, Lai L L.A novel excitation scheme for a stand-alone three-phase induction generator supplying single-phase loads[J]. IEEE Transactions on Energy Conversion, 2004, 19(1): 136-143. [9] Spirov D S.The operation of a three-phase induction motor in single-phase power supply under Smith’s scheme[C]//2018 20th International Symposium on Electrical Apparatus and Technologies (SIELA), Bourgas, Bulgaria, 2018: 1-4. [10] Chan T F, Lai L I.Steady-state analysis of a three- phase induction motor with the Smith connection[J]. IEEE Power Engineering Review, 2000, 20(10): 45-46. [11] Spirov D.Investigation of the starting mode of a three-phase induction machine with single-phase power supply[C]//2020 21st International Symposium on Electrical Apparatus & Technologies (SIELA), Bourgas, Bulgaria, 2020: 1-4. [12] Smith O J M. Large low-cost single-phase SEMIHEXTM motors[J]. IEEE Transactions on Energy Conversion, 1999, 14(4): 1353-1358. [13] Zhong Hui, Wang Xiuhe, Leng Xuemei, et al.Steady-state performance analysis of three-phase induction motor with SEMIHEX connection[C]//2007 2nd IEEE Conference on Industrial Electronics and Applications, Harbin, China, 2007: 269-272. [14] 孙树敏, 王秀和, 裴英, 等. 基于SEMIHEX接法永磁同步电动机单相运行稳态性能[J]. 电机与控制学报, 2013, 17(5): 32-37, 44. Sun Shumin, Wang Xiuhe, Pei Ying, et al.Steady- state performances of single-phase operation of line-start permanent magnet synchronous motor with SEMIHEX connection[J]. Electric Machines and Control, 2013, 17(5): 32-37, 44. [15] Wang Xiuhe, Zhong Hui, Yang Yubo, et al.Study of a novel energy efficient single-phase induction motor with three series-connected windings and two capa- citors[J]. IEEE Transactions on Energy Conversion, 2010, 25(2): 433-440. [16] 仲慧, 王秀和, 张成, 等. 三绕组串联式高效单相感应电动机瞬态性能[J]. 电工技术学报, 2011, 26(4): 32-39. Zhong Hui, Wang Xiuhe, Zhang Cheng, et al.Transient performance of a novel high efficiency single-phase induction motor with three series-- connected windings[J]. Transactions of China Elec- trotechnical Society, 2011, 26(4): 32-39. [17] 裴英, 王秀和, 仲慧, 等. 新型三绕组并联式高效单相感应电动机稳态性能[J]. 中国电机工程学报, 2011, 31(36): 102-108, 244. Pei Ying, Wang Xiuhe, Zhong Hui, et al.Study of steady-state performances for a novel energy-efficient single-phase induction motor with three parallel- connected windings[J]. Proceedings of the CSEE, 2011, 31(36): 102-108, 244. [18] 裴英, 王秀和, 杨玉波, 等. 三绕组并联式单相感应电动机起动方式研究[J]. 电机与控制学报, 2012, 16(4): 72-78. Pei Ying, Wang Xiuhe, Yang Yubo, et al.Study of starting method for single-phase induction motor with three parallel-connected windings[J]. Electric Machines and Control, 2012, 16(4): 72-78. [19] 郑晓钦, 吴新振, 张阳. 改进Steinmetz接法三相异步发电机稳压电容计算[J]. 电工技术学报, 2018, 33(增刊2): 338-343. Zheng Xiaoqin, Wu Xinzhen, Zhang Yang.Calcu- lation of voltage stabilizing capacitance of three- phase asynchronous generator with improved Steinmetz connection[J]. Transactions of China Electrotechnical Society, 2018, 33(S2): 338-343. [20] Yukhalang S, Sopapirm T, Kinnares V.Three-phase self-excited induction generator operating as single- phase induction generator using static VAR com- pensator[C]//2023 20th International Conference on Electrical Engineering/Electronics, Computer, Tele- communications and Information Technology (ECTI- CON), Nakhon Phanom, Thailand, 2023: 1-7. [21] 王喜莲, 秦嘉翼, 耿民. 基于d-q变换及WOA-LSTM的异步电机定子匝间短路故障诊断方法[J]. 电机与控制学报, 2024, 28(6): 56-65. Wang Xilian, Qin Jiayi, Geng Min.Asynchronous motor stator turn-to-turn short circuit fault diagnosis based on d-q transform and WOA-LSTM[J]. Electric Machines and Control, 2024, 28(6): 56-65. [22] 戈宝军, 姜超, 吕品, 等. 大型核电汽轮发电机非全相运行转子动态电磁力分析[J]. 电机与控制学报, 2021, 25(5): 26-35. Ge Baojun, Jiang Chao, Lü Pin, et al.Analysis of rotor dynamic electromagnetic force in large nuclear turbines under open-phase operation condition[J]. Electric Machines and Control, 2021, 25(5): 26-35. [23] 胡岩, 武建文, 李德成, 等. 小型电动机现代实用设计技术[M]. 北京: 机械工业出版社, 2008. [24] 孙克军. 电机常用技术数据速查手册[M]. 北京: 中国电力出版社, 2009. [25] 夏云彦, 周洲, 邵远亮, 等. 基于动态磁网络法大型感应电机阻抗参数及起动特性计算[J]. 电工技术学报, 2024, 39(14): 4341-4352. Xia Yunyan, Zhou Zhou, Shao Yuanliang, et al.Calculation of impedance parameters and starting characteristics of large induction motor based on dynamic magnetic network[J]. Transactions of China Electrotechnical Society, 2024, 39(14): 4341-4352. [26] 杨思莹, 王松, 陈志豪, 等. 基于优化算法的变压器绕组等效电路建模[J]. 电气技术, 2023, 24(8): 29-36, 49. Yang Siying, Wang Song, Chen Zhihao, et al.Equivalent circuit modeling of transformer winding based on optimization algorithms[J]. Electrical Engineering, 2023, 24(8): 29-36, 49. [27] 武岳, 张志锋. 轴向磁通永磁电机扁铜线交流铜耗的混合解析计算及抑制[J]. 电工技术学报, 2023, 38(24): 6609-6618. Wu Yue, Zhang Zhifeng.Hybrid analytical calcu- lation and suppression of AC copper loss of flat copper wire in axial flux permanent magnet motor[J]. Transactions of China Electrotechnical Society, 2023, 38(24): 6609-6618. [28] 师蔚, 骆凯传, 张舟云. 基于热网络法的永磁电机温度在线估计[J]. 电工技术学报, 2023, 38(10): 2686-2697. Shi Wei, Luo Kaichuan, Zhang Zhouyun.On-line temperature estimation of permanent magnet motor based on lumped parameter thermal network method[J]. Transactions of China Electrotechnical Society, 2023, 38(10): 2686-2697.
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