双凸极构造的电磁液冷缓速器制动力矩的数值模拟

Numerical Simulation on Braking Torque of Electromagnetic Liquid Cooled Retarder With Doubly Salient Poles

针对液力缓速器结构复杂、价格高的缺点,提出一种具有双凸极构造且定子内置水道的电磁液冷缓速器设计方案.建立制动系统模型,运用有限元法分析静态和瞬态缓速器内电磁场变化规律、制动特性及磁饱和程度.设计制作2000 N·m样机,通过实验测试,实验结果与有限元分析计算结果相差5%以下,得出在750 r/min时制动力矩达到稳定值,并且在转速1000 r/min、励磁电流为90 A时制动力矩可达到2030 N·m.

Because the hydraulic retarder has the shortcomings of complicated structure and high price, a new type of eddy current retarder was proposed, including stator with internal cooled channel and doubly salient poles rotor. A braking system model was established. The electromagnetic field was analyzed by static and transient finite element method. Distribution regularity of electromagnetic field and braking characteristics were obtained. A 2 000 N·m prototype was tested to verify the braking performance at a test bench. The test results show that the difference between the calculated and the measured results is below 5%. The braking torque reaches a stable value at 750 r/min. When the speed is 1 000 r/min and exciting current is 90 A, the braking torque reaches 2 030 N· m.