机械

电动机作为旋喷泵拖动系统的关键设备，其起动时间直接关系到设备的运行安全与寿命。针对旋喷泵因转动惯量增加而导致电动机面临起动时间过长、起动困难以及温升超限风险等问题，为提升电动机的起动可靠性，结合旋喷泵单轴电机拖动系统结构模型、电动机机械特性与泵类负载特性，建立电动机起动时间与负载转动惯量的微分方程，采用离散分段迭代方法求解起动时间。结果表明，转动惯量与起动时间呈线性正比关系。以RP5010S型旋喷泵(转动惯量为3.942 kg·m²)配套的YBX4-200L1-2WF2/30kW电动机为例，通过图解法分析闭阀工况下电动机直接起动的转速-时间关系，得出起动时间为7.81 s，满足工程设计要求。该研究结果可为大转动惯量高扬程旋喷泵的电动机选型与起动性能校核提供理论依据。

As a key component of the drag system of a rotary jet pump, the motor's starting time directly affects operational safety and lifespan of the equipment. Due to the increase in the moment of inertia of the rotary jet pump, the motor is exposed to problems such as long starting times, difficulty in starting, and the risk of exceeding the temperature rise limit. In order to improve the starting reliability of the motor, the differential equations of the motor starting time and the load moment of inertia are established, combined with the structure model of the single-axis motor drag system of the rotary jet pump, the mechanical characteristics of the motor and the load characteristics of the pump. The starting time is solved by using a discrete segmented iteration method that combines the motor's mechanical characteristics with the torque characteristics of the pump load. The results show that the moment of inertia is linearly proportional to the starting time. Taking the YBX4-200L1-2WF2/30 kW motor for RP5010S rotary jet pump(with a moment of inertia of 3.942 kg· m²) as an example, the speed-time relationship during direct motor starting under closed-valve conditions was analyzed by the graphical method, and the starting time was obtained as 7.81 s, which met the engineering design requirements. These findings provide a theoretical basis for motor selection and start-up performance verification of high-head rotary jet pumps with a large moment of inertia.