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Ring Groove surface composite rotor induction motor with the end of the electromagnetic field coefficients


Department of effect (take three-dimensional calculation) of the rotor impedance, excluding end effect (by two-dimensional calculation) the ratio of the rotor resistance. In the slip and rotor current under the same conditions, there is K. h one by one ... the results from the two-dimensional field of S is obtained (see literature): S (2d )=--_ j more _) 2l (ch.tg + D】 shhlg) (chJg + DlshXlg) skill (9) , type (1I) into (10),[link widoczny dla zalogowanych], may end coefficient: I (Σ falling. ± in the stack of plastic'±',( nRa) lchX2d-I-D2shX2dl (ch), zd-l-Dsh ') ( shL ~ d'-I-D'zch). . ; D) having regard to the practicality and the nonlinear coefficient of the end, this paper ends the following formula for calculating the coefficient (see literature): =. t + compression in. T port for a n (D. A 2d,) / (2p), △: ii), a calculation example for 5 Ring Groove on the surface of composite rotor induction motor three-dimensional magnetic field distribution for qualitative and quantitative analysis, and magnetic field analysis and verification Coefficient end and accuracy of this prototype of a magnetic field is calculated, and its performance was calculated and measured, the prototype of the main parameters: m A 3,2 p a 4,[link widoczny dla zalogowanych], g a 0.07cm, WK . A 2 1.56, D,[link widoczny dla zalogowanych],: 13.46cm, L16cm ・ O2 = 32,[link widoczny dla zalogowanych], h-1.8cm. b = 0.4cm, d a 0.3cm, b2-0. 】 5cm, d,: 0.22cm. A = number of O ring groove 40. 5.1 The distribution of the magnetic field of the prototype three-Wei Jibo this field considering the nonlinear ferromagnetic saturation was calculated under the circumstances,[link widoczny dla zalogowanych], has been the amount of the electromagnetic motor along the axial distribution. Figure 2 is the rotor surface flux density distribution along the axis; Figure 3 is the rotor field strength along the surface of a 2l (v / M) </. / E-ring 2s-1.0. Il = 68. ● A. t-0 circle 3s-l ・ 0 ・ Il cover 68 ・ ● A-t 10 decline of the rotor surface flux density distribution along the surface of the rotor axial electric field distribution along the axis in Figure 2, Figure 3 shows the motor The distribution of the magnetic field has the following characteristics: (1) cut to the end of the rotor flux density decreases rapidly in the rotor base is a constant central value; axial flux density mainly in and around the area transferred to the end. (2) the presence of the squirrel cage winding, the radial flux density and electric field strength near the tangential component of the rotor position of the end of the existence of an extreme value. (3) composite rotor surface after Ring Groove. More times in the two-dimensional electrical field distribution. Mainly to the magnetic vortex weakens, the saddle-shaped distribution of radial flux density is not obvious, the axial flux density was significantly reduced. Reflected in the end effect, this is a factor reducing end. (D) layer of the rotor ring groove is smaller than the equivalent permeability of the rotor magnetic permeability of steel sleeve, the tangential surface of the rotor flux density and axial flux density is much less than the value before the Ring Groove. 5.2 experiment Ring Groove composite rotor surface after the end of the motor factor can be used (12) calculated the accuracy of calculation can be compared with the nonlinear solution to verify the results. For example, S = 0.2, the nonlinear solution are K. = 1.202, (12) the result is K = 1.231, both close. In order to objectively validate the end of the coefficient formula and the magnetic field analysis is correct, the characteristics of the prototype was calculated and measured, the calculation formula with coefficient of this end of the rotor impedance correction. Figures 4 and 5, respectively, the stator current, the output torque curve with the change of the slip. From the figure shows, when the applied voltage and the slip in the larger context of change. Calculated and measured values are still very consistent, which proves the correctness of the theoretical analysis 6 Conclusions In this paper, analytical method has been considered the motor of nonlinear ferromagnetic saturation three-dimensional magnetic field calculation is proposed for engineering end of the coefficient formula, the kind of motor which provides the conditions for practical calculations. A 22-IiCA) 0SS prince Yu {stator current curve - calculated values ... ... Feast 9 lb (Ko ・ M) Reference 5 S prince Yu torque curve - calculated values ... ... Feast Li Lin Jinming I a value of 1 Sorting , TANG shop. Based on solving the complex three-dimensional magnetic field sets the end induction motor rotor coefficients. China Electrotechnical Society, 1993 (1): 1 ~ 62 Cheung Tsz Fung. Electromagnetic field. Higher Education Press, 19833 Chapter Name Tao. Xiaoru Hong forward. The motor's electromagnetic field. Machinery Industry Press, 19884 Sorting. Recovering rotor induction motor electromagnetic theory and practical calculation method. Huazhong University of Science thesis, 1993 23

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