Study on Electromagnetic Characteristics of a Novel Eddy Current Brake Excited by Toothed Coils

doi:10.12382/bgxb.2022.0709

Abstract

Abstract:

To improve the power density of fast-response and easily controlled eddy current brakes for heavy-duty vehicles, the method of constructing a three-dimensional magnetic circuit by using axially convex toothed coils and overexcitation design technology are proposed. Based on the finite element method, the steady-state and quasi-steady-state electromagnetic field calculation models of the novel high-energy eddy current brake and two traditional eddy current brakes are established, and their magnetic circuit, air gap magnetic density, eddy current distribution and overexcitation braking characteristics are analyzed. The results show that the eddy current of the novel high-energy eddy current brake is distributed in the whole axial space on the inner surface of the rotor. When the speed is less than 3500r/min, its braking torque is significantly higher than the other two traditional eddy current brakes. And the overexcitation design can effectively improve the braking performance. Since the coil current density is increased to 3 times, the braking torque is increased by 0.65 times, which can provide instantaneous high torque for vehicle emergency braking and shorten the braking distance of the vehicle by 30%.

Key words: auxiliary brake, eddy current brake, magnetic circuit, overexcitation

CLC Number:

U463.53

TIAN Jinshan, NING Keyan, PANG Huiren, LAN Hai, SHUAI Zhibin, MAO Ning, GAI Jiangtao, ZHOU Guangming. Study on Electromagnetic Characteristics of a Novel Eddy Current Brake Excited by Toothed Coils[J]. Acta Armamentarii, 2023, 44(1): 290-297.

Figures/Tables 15

Fig.1 Structure and magnetic circuit diagram of eddy current brakes

Fig.2 Computational domain and mesh based on finite element technology

Fig.3 Calculation flow chart of vehicle braking

Fig.4 Vector diagram of magnetic induction intensity

Fig.5 Contour of air gap magnetic density

Fig.6 Eddy current vector diagram

Fig.7 External braking characteristics of the three eddy current brakes

Fig.8 Braking characteristics with overexcitation

Fig.9 Air gap magnetic density of the 3-D magnetic circuit

Fig.10 Air gap magnetic density of the axial magnetic circuit

Table 1 Minimum breakdown voltage of enameled wire with nominal diameter exceeding 2.5mmV

等级	室温	高温
1级和1B级	1300	1000
2级和2B级	2500	1900
3级	3800	2900

Table 2 Heat resistance grade of enameled wire

等级	Y	A	E	B	F	H	C
最高许可温度/℃	90	105	120	130	155	180	>180

Table 3 Working hours of coils under overexcitation condition

电流密度倍数	制动扭矩/(N·m)	工作时长/s
1	2873	475.7
2	4099	118.9
3	4742	52.9
11.25	7420	3.8

Fig.11 Vehicle braking characteristics

Table 4 Statistical results of vehicle braking

电流密度倍数	1	3	11.25
制动时间/s	14	10	7.1
制动距离/m	132	93	65

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