Overview
The slip ring asynchronous motor, also known as a wound-rotor induction motor, is designed for applications demanding controlled acceleration and high starting torque. Unlike standard squirrel-cage motors, its rotor features windings connected to external slip rings, enabling resistance adjustment via external circuits. This design allows precise control over torque and speed during startup, making it ideal for heavy-load machinery. Common industrial uses include hoists, ball mills, and large pumps. The motor's adaptability to variable load conditions has cemented its role in sectors like mining, manufacturing, and material handling.
Structure and Working Principle
The motor consists of a stator with three-phase windings and a rotor with insulated windings terminated at three slip rings. Carbon brushes maintain electrical contact with the rotating rings, connecting to an external resistance bank. During operation, the stator's rotating magnetic field induces current in the rotor windings. By varying the external resistance, operators can control rotor current and thus torque characteristics. Higher resistance at startup reduces inrush current while increasing torque, enabling smooth acceleration under heavy loads. As the motor reaches full speed, resistance is gradually minimized for efficient running.
Key Features
1. **Adjustable Torque**: External resistance allows customized torque-speed curves for diverse load profiles. 2. **Reduced Starting Current**: Typically 1.5–2.5 times full-load current (vs. 5–7 times in squirrel-cage motors), minimizing grid impact. 3. **Robust Construction**: Heavy-duty bearings and reinforced shafts handle mechanical stress in industrial environments. Additional advantages include overload tolerance and compatibility with electromechanical speed controllers. However, slip ring maintenance (brush wear, dust accumulation) adds operational complexity compared to squirrel-cage designs.
Application Areas
Primary applications leverage the motor's high starting torque and speed regulation: - **Material Handling**: Bridge cranes, winches, and conveyor systems. - **Heavy Industry**: Crushers, compressors, and rolling mills. - **Energy Sector**: Large fans and pumps in power plants. Specialized variants serve marine propulsion and wind turbine pitch control systems. The motor's adaptability also makes it suitable for retrofitting older equipment where modern variable-frequency drives (VFDs) are impractical.
Maintenance and Precautions
Regular inspection of brushes, slip rings, and cooling systems is critical. Brush replacement intervals depend on operational hours and load cycles; typical lifespan ranges 6–24 months. Key maintenance tasks include: 1. Cleaning slip rings with alcohol to remove carbon dust. 2. Checking brush spring tension to ensure proper contact pressure. 3. Monitoring resistance bank connections for corrosion or loose terminals. Environmental precautions include IP54 or higher enclosures for dusty/wet conditions and vibration dampers for installations near heavy machinery.
B2B Procurement Guide
When sourcing slip ring asynchronous motors, prioritize: 1. **Power Matching**: Select frame size and kW rating based on peak load requirements, including safety margins. 2. **Customization Options**: Specify voltage (common: 380V, 415V, 6.6kV), mounting type (B3 foot-mounted, B5 flange), and insulation class (typically F or H). 3. **Supplier Capabilities**: Prefer manufacturers with in-house testing facilities for load and heat-run tests. Lead times for standard models average 4–8 weeks; customized units may require 12+ weeks. For cost efficiency, consider total lifecycle expenses—higher-quality units often justify premium pricing through extended service intervals.
Related Manufacturers
- 主营：电刷架、导电环、集电环、导电滑环、碳刷滑环、刷架总成、碳刷标准、高压电机、石墨碳刷电刷、碳刷在线监测、碳粉收集器
- 主营：导电滑环、集电环、碳刷、碳刷架
- 主营：西玛电机、高压电机、YE5一级能效电机、高效节能电机、Z4直流电机
- 主营：传感器、电磁阀、保护器、地磅、电动脚手架、装载机电子秤、机械抓手、砌筑升降平台、光伏板升降机、内撑吊具、混凝土振动棒、打标机、研磨机、裁切机、平移门电机、超市防盗门、磨片磨头、滑移机、消防机器人、农业打药机、履带底盘、消防器材
- 主营：高压电机、西玛电机、Z4直流电机、三相异步电机、防爆电机、变频电机、高效电机、冶金起重电机、西马电机、高效率节能电机、变频调速电机
- 主营：卧龙电气南阳防爆、上海上力防爆电机、YBX5/4/3电机、YPT3变频调速三相异步电动机、YB3高压隔爆型三相异步电动机、YFB系列粉尘电机、YBBP防爆变频电机、YE5/4/3电机、YFBX4电机、YBBP电动机、YE3电动机、YE4电动机、YE5电动机、YKK高压电机、YPT3电机、西安西玛Z4直流电机、Z/Z2/4直流电机
- 主营：消防机器人、履带运输车、漏电探测仪、巡检机器人、消防箱、消防服、破拆工具组、干粉灭火器、打药喷雾机、传感器、电磁阀、保护器、电动脚手架、装载机电子秤、砌筑升降平台、光伏板升降机、内撑吊具、混凝土振动棒、打标机、裁剪机、研磨机、压铆机、小型装载机、洗消剂、防爆风机
- 主营：转子测、温度监测、远程监控、定子测温仪、高效运维助手、智能预警系统、多维度数据采集
- 主营：风机、电机保护器、变频器、三相异步电动机、电磁制动三相异步电动机、铝壳三相异步电动机、软启动器、变频柜、水泵、软启动柜、双速电机、变频制动电机、YBF3防爆电机、YSF轴流风机电机、起重电机、变频调速电机、电磁调速电动机、铝壳变频电机、自耦降压启动柜、冶金起重电机、起重变频电机、YBX3防爆电机、防爆变频电机、粉尘防爆电机、伺服电机
- 主营：空压机、进口配件、劳保鞋、半导体、劳保手套、防护服、科尔奇、船舶配件、电机、充电器、防爆箱、潜水收纳包、传动件、发电机、轴承、浮艇、劳保眼镜、机油、无人机配件
- 主营：拉矫机电机、电动机、绳锯机电机、滑环电机、永磁同步电机、冷却塔电机、高速电机、发电机组、中频发电机组、同步电机、水塔电机、起重电机、防水电机、节能电机、切割电机、直流电机、钻机电机、变频电机、水冷电机、航运电机、风机电机、调速电机、水冷变频调速电机、耐高温电机
- 主营：ye3电机、电动机、减速电机、异步电机、三相异步、起重电机、交流电机、电机马达、全铜电机、铝壳电机、防爆电机、水泵风机、三项电机、刹车电机、转子电机、变频电机、起重马达、马达绕线、调速电机、三相电机、变频制动电机、马达国标铜线、三相国标电机
- 主营：集电环、导电环、电刷、电机滑环、电机碳刷、直流电机碳刷、碳刷架、铝风叶、电机铝风叶、电机风罩、不锈钢电机风罩、电刷架、碳刷盒、电刷盒、电机配件、换向器、电机铜头、电机集电环、发电机碳刷、电机接线柱、防爆电机接线柱、防爆电机风罩、防爆电机风叶、电机端盖、设备导电环
- 主营：电磁阀、密封件、电动机、轴承润滑、主轴轴承、弹性轴承、扭力弹簧、滚子轴承、十字轴承、轴承磨床、高速轴承、密封轴承、滚针轴承、直线轴承、支撑轴承、滑块轴承、弹簧轴承、圆柱轴承、双列轴承、机床轴承、十字弹簧、机械轴承、磁性开关、枢轴轴承、调心球轴承
- 主营：ykk高压、6kv电机、jsl电机、异步电机、电动机、ykk电机、jr138-8-2、破碎机、yks电机、650kw6000v、jr158-8-380、jr137-6-280、jr127-8-130、jr137-8-210、jr127-6-185、jr128-8-180、磨机电机、同步电机、鼠笼电机、立式高压、绕线水冷、水泵高压、立式电机、水泵电机、js158-86000v