低脉动无刷力矩电动机是当今世界上最先进的力矩电动机之一，是一种无槽无刷力矩电动机，具备超低力矩波动（没有齿槽波动力矩）、高输出线性度、高转矩重量比等特点，是最新一代的直驱无刷力矩电动机，是高稳定性伺服系统的核心器件和主要执行元件，在高性能宇航、船舶、兵器等需要高精度、高稳定性伺服系统中具有广泛的应用需求。因此对低脉动无刷力矩电动机的研究成为国内外研究的重点，尤其是在国外将此类产品划入对我国的严格禁止出口产品范围内，所以我国对于此类产品的研究具有更加紧迫的需求。 ZWSC电机即为无槽无刷力矩电动机，是一种分装式的盘式超薄无刷电机，结构上具有典型的大内孔、短轴向尺寸的薄形力矩电机的特点，容易发生机械变形，使得电机的电磁场发生不规则变化，使得系统对电流反馈信号的采集受到偏移或者失去电流信号；机械性变会使封装材料开裂，使电枢线圈匝间发生短路，严重破坏系统稳定性，甚至使系统完全失效，无法完成系统功能。 为了解决电机的变形和材料的开裂问题，使电机能够满足ZWSC电机驱动控制系统对高稳定性的要求，以及ZWSC电机在系统中反馈电流信号稳定可靠，本文通过对灌封用树脂进行配方研究，使材料的强度与柔韧性达到平衡，既能满足在薄璧件电枢合理变形量范围内不开裂，又能够对电枢的结构有一定的保持作用，使电枢变形不能够达到影响电机正常使用的程度；解决薄璧件灌封工艺稳定性问题。灌封材料在一定温度下各种组分充分混合，达到灌封流动性要求，并在固化温度下发生化学反应，形成均一稳定的聚合物。利用旋转粘度计、热失重测试仪、力学试验机、热冲击试验箱等对材料的粘度、耐热等级、力学强度和环境适应性等进行测试，利用ZWSC电机驱动控制系统对电机反馈电流进行特性测试，结果如下： 灌封后结构稳定的ZWSC电机能够在高稳定系统中反馈正常的电流信号，并且可以持续准确的输出低脉动的恒定力矩，保证系统平稳精确地运行，能够表现出电机自身的输出力矩低脉动特性。 成型收缩率： 0.6% 耐热温度： 180℃ 冲击强度： 15.8kg.cm/cm2 热冲击性： （O型环法）室温～180℃～室温，未见开裂。 经试验证明：该体系可以满足耐热等级为F级的无槽电机灌封要求。 ZWSC电机在无刷电机驱动系统中能够实现反馈电流信号的采集，并且可以持续准确的输出低脉动的恒定力矩，保证系统平稳精确地运行。

Low ripple of brushless torque motor is a kind of slotless and brushless torque motor, which is one of the most advanced torque motor in the world today. It has low torque fluctuation (no cogging torque fluctuations), high linearity, high torque to weight ratio, etc. It’s the latest generation of brushless direct drive torque motor, which playing the part of the core of the high stability of servo system device and the executive cell. It has widely application requirements in high precision, high stability of servo systems, such as high-performance aerospace, ship, and weapons. Thus, the study of low ripple brushless torque motor becomes the key point of the research at home and abroad. Especially that, in foreign countries, this torque motor is strictly forbidden to export to our country, therefore, Studying it has become increasingly important and pressing. Slotless brushless torque motor is called ZWSC for short and is a kind of packing disc ultra-thin brushless motor with the typical ouchi holes and short axial dimensions. It’s prone to mechanical deformation, which makes the electromagnetic field of the motor change irregularly, and the material even craze. What’s more, it causes short-circuiting between armature coils, which severely weaken the stability of the system, and even make the system completely useless, so as to unable to complete its functions; The phenomenon that the material cracking make the motor armature unable to meet the environmental requirements of the system, especially in hot and humid, salt fog and high or low temperature, and so on. In order to solve the problems above, and make the motor meet the requirements of equipment system for high stability and make the feedback of the turn signal is stable and reliable in the system, this article focuses on the formulation of the sealed resin, to balance the strength and the flexibility of the material. On the one hand, it can be indehiscent within the scope of reasonable deformations, on the other hand, it can keep the structure of the armature, ensure the normal use of the motor when the armature is distorted; what else, the text has solved the problem of the stability of the BoBi potting process. At a definite temperature, mix up each ingredient of the encapsulating material, meet the requirement of the potting liquidity, and react chemically under the curing temperature , then it forms a uniform stable polymer[1]. After testing about the viscosity, temperature classification, mechanical strength and environmental adaptation of the material with rotational viscometer, Martin heat resistant, mechanical testing machine, thermal shock test chamber, the results are shown below: Molding shrinkage: 0.6% temperature resistance: 180℃ thermal shock resistance:（O-rings method）180℃, no cracking The experiment proves that the system can satisfy the slotless electric machines with the heat resistant level of F. The ZWSC motor can achieve the feedback of the turn signal in brushless motor drive system , and it keeps accurate output of low constant torque pulsation, so that the system runs steady and accurately. Study type: Applied research