{'fraction_non_alphanumeric': 0.011585807385952208, 'fraction_numerical': 0.004344677769732078, 'mean_word_length': 5.197309417040358, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
The Study of the Air Gap Optimization for the Liquid-Cooled and Embedded Eddy Current Retarder Considering Thermal Deformation

Heavy-duty vehicles are generally equipped with a non- contact auxiliary brake system to ensure safe driving. As an actuator for the auxiliary brake system, liquid- cooled and embedded eddy current retarder has significant advantages in braking performance compared to the traditional eddy current retarder. The braking performance is better with the smaller gap between the stator and rotor of the retarder proved by theoretical analysis and the finite element analysis. The small gap causes conflict between the stator and rotor when the retarder works for a long time. The paper studies thermal influence on deformation of the retarder at work by establishing a multi-field coupled finite element model. And the results of the numerical simulation show that the maximum radial deformation of the stator is 0.54mm when the braking power of the retarder is 120kW. The numerical simulation results are basically consistent with the experimental results, which proves that the deformation during the continuous working of the retarder is mainly caused by thermal strain. This research provides theoretical basis and research methods for gap design between the stator and the rotor and material selection standards for high power electromagnetic products.