Theoretical Analysis and Calculation of Solenoid Electromagnetic System for Miniature Circuit Breaker

doi:10.16628/j.cnki.2095-8188.2022.06.013

Abstract

Abstract:

The overall analysis of the miniature circuit breaker(MCB) solenoid electromagnetic system is carried out based on the electromagnetic suction force.Starting from the analysis of the magnetic circuit,the suction formula of the DC solenoid electromagnetic system and the AC solenoid electromagnetic system are derived.The instantaneous value,maximum value and average value of the electromagnetic suction force are further analyzed and deduced by using the suction characteristics of the AC electromagnetic system.The electromagnetic system of DC and AC MCB is calculated in practice by using the suction formula,which provides the data support for the design of reaction springs.Finally,quantitatively analyzing the universality of DC and AC MCB,the adjustment method of the reaction force spring is given.

Key words: miniature circuit breaker (MCB), solenoid electromagnetic system, magnetic circuit analysis, DC electromagnetic system, AC electromagnetic system

CLC Number:

TM561

WEI Bo, ZHAO Zhisheng, REN Changbin, ZHAO Ming, ZHAI Ziye, LI Haili. Theoretical Analysis and Calculation of Solenoid Electromagnetic System for Miniature Circuit Breaker[J]. LOW VOLTAGE APPARATUS, 2022, 0(6): 69-74.

Figures/Tables 5

References 10

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额定电流/ A	线圈匝数/ 匝	动铁心半径/ mm	动、静铁心气隙/ mm	瞬动校验电流倍数	电磁吸力理论值/ N	反力弹簧力值/N
2	46	3.4	3.1	6.5	0.848	0.88
4	23.5	3.4	3.1	6.5	0.886	0.88
6	20	3.4	3.1	6.5	1.443	1.50
10	9	3.4	3.1	6.5	0.812	0.88
16	7	3.4	3.1	6.5	1.257	1.24
20	5	3.4	3.1	6.5	1.002	1.24
25	4	3.4	3.1	6.5	1.002	1.24
32	4	3.4	3.1	6.5	1.642	1.50
40	4	3.4	3.1	6.5	2.566	2.30
50	3	3.4	3.1	6.5	2.255	2.30
63	2	3.4	3.1	6.5	1.591	1.50
80	2	3.4	3.1	6.5	2.566	2.30

额定电流/ A	线圈匝数/ 匝	动铁心半径/ mm	动、静铁心气隙/ mm	瞬动校验电流倍数	电磁吸力理论平均值/N	反力弹簧力值/ N	电磁吸力理论最大值/N
6	20	3.4	3.1	7.5	1.921	2.30	3.843
10	9	3.4	3.1	7.5	1.081	1.50	2.162
16	7	3.4	3.1	7.5	1.674	1.96	3.347
20	5	3.4	3.1	7.5	1.334	1.50	2.669
25	4	3.4	3.1	7.5	1.334	1.50	2.669
32	4	3.4	3.1	7.5	2.186	2.30	4.372
40	4	3.4	3.1	7.5	3.416	3.30	6.832
50	3	3.4	3.1	7.5	3.002	3.30	6.004
63	2	3.4	3.1	7.5	2.118	2.30	4.237
80	2	3.4	3.1	7.5	3.416	4.50	6.832