Overview
Non-excited brakes, also known as fail-safe brakes, are mechanical braking devices designed to engage automatically when power is removed or lost. Unlike electrically excited brakes that require continuous power to maintain a braked state, non-excited brakes use springs or permanent magnets to provide the braking force. These brakes are particularly valuable in safety-critical applications where power outages must not compromise braking capability. The design typically includes friction discs or shoes that engage when the excitation force is removed, making them inherently reliable for emergency stopping situations.
Structure and Working Principle
The basic structure of a non-excited brake consists of a rotor connected to the shaft being braked, stationary friction surfaces, and an actuation mechanism (usually springs). When in normal operation with power applied, an electromagnetic force counteracts the spring pressure, keeping the brake disengaged. Upon power loss or deactivation, the spring force overcomes any residual magnetic force, pushing the friction surfaces together to create braking torque. Some designs use permanent magnets instead of springs, with the magnetic circuit being completed through the armature when de-energized. The braking force is proportional to the spring pressure or magnetic strength and the friction coefficient of the lining material.
Key Features
The primary advantage of non-excited brakes is their fail-safe nature - they automatically engage when power fails, making them ideal for safety applications. They typically offer high torque-to-size ratios and can maintain braking force indefinitely without power consumption. Modern designs incorporate wear compensation mechanisms to maintain consistent performance as friction materials degrade. Many models are also designed for easy maintenance with accessible adjustment points and replaceable friction components. Some high-performance versions include thermal protection features to prevent overheating during prolonged braking.
Application Areas
Non-excited brakes are extensively used in elevator systems as safety brakes that engage if the drive system fails. They're also common in crane and hoist applications where load holding is critical. Industrial machinery often incorporates them for emergency stopping and position holding. In the renewable energy sector, they serve as parking brakes for wind turbines. Transportation applications include rail vehicle brakes and conveyor system stops. The medical equipment industry uses smaller versions for precise positioning in imaging devices and surgical robots.
Maintenance and Precautions
Regular inspection of friction surfaces is essential to ensure proper braking performance. Worn linings should be replaced before they reach the manufacturer's specified minimum thickness. All moving parts should be kept properly lubricated according to the manufacturer's recommendations. Environmental factors like dust, moisture, and temperature extremes can affect performance. In harsh environments, sealed or specially coated versions may be necessary. Electrical connections should be checked periodically to ensure proper operation of the release mechanism when power is applied.
B2B Procurement Guide
When sourcing non-excited brakes, specify the required torque rating, shaft size, and operating voltage. Consider the duty cycle and environmental conditions the brake will face. For OEM applications, discuss customization options like special mounting configurations or materials. Lead times for specialized brakes can be several weeks, so plan procurement accordingly. Request documentation including torque curves, thermal characteristics, and expected service life. For maintenance purchases, ensure compatibility with existing equipment by providing model numbers or detailed specifications.
Related Manufacturers
- 主营：开关电源、电机、UPS电源、非励磁制动器、警示灯、传感器、变频器、连接器、开关按钮、阀门、压力开关、端子台、检电笔、电抗器、仪表
- 主营：方孔螺旋钻、电动玻璃吸盘车、玻璃安装机械手、矿用KPZ盘式制动器闸瓦、液压拔管机、回收式喷砂机、移动式喷砂机、箱式喷砂机、龙门压力机、短管置换设备、移动式洗车槽、卷盘喷灌机、智能张拉设备、智能压浆台车、车载马路吹风机、智能清淤机器人、车载式绿篱修剪机、扫雪滚刷、车载式护栏清洗机、电动液压扳手、管道内壁喷涂器、中部取样器、玻璃吸盘、树叶收集车、智能钢管套丝机、全自动升降柱
- 主营：矿用风门、钻孔轨迹仪、钻孔定向仪、直动盘式制动器、测斜仪、矿用钢丝绳探伤仪、矿用掘进机、矿用采煤机、矿用装载机、刮板机、输送机、给煤机、绞车、矿车、混凝土搅拌机、混凝土输送泵、喷浆机、履带钻机、潜孔钻机、单体液压支柱、防爆风机、钻孔成像仪、铁路钢轨、变压器、螺旋支柱
- 主营：发送器、减速机、罐道轮、东达机电猴车制动器、行车门、擦靴机、扩音器、遥控器、凿岩机、破拱器、注浆泵、气控箱、清理机、控制箱、阻化剂、装岩机、机甲带、防爆门、拆装机、推雪铲、粘胶板、主控箱、疏通机、显示屏、发动机、装载机
- 主营：注浆泵、注液泵、防爆摄像仪、制动器、气体检测仪、自动隔爆装置、自救器、钻机、钻头钻杆、电机车、避难硐室、托辊、压风自救装置、铁路、排渣器、放水器、防回火、防回水回气、巷道灯
- 主营：矿山机械、铁路设备、救援设备、电磁制动器、防爆电器、路面机械、工程机械
- 主营：防风制动器、鼓式制动器、盘式制动器、风电制动器、电磁制动器、气动制动器
- 主营：制动器
- 主营：测试机、测功机、刹车器、制动器、控制源、控制器、阻尼器、压装机、输出器、磁滞机、压力机、电流测试、测试系统、调节装置、控制电源、电机测试、寿命测试、刹车调节器、负载模拟器、电磁加载器、扭矩测试仪、扭力检测仪、磁滞驱动器、扭矩调节器、扭矩加载器
- 主营：减速机、电磁阀、联轴器、电磁制动器、三菱plc、gtr日精、胀紧套、传感器、电压表、板式管、超声波、升降机、换向器、三菱电机、减速电机、减速马达、滚子链条、gwk吉维克、发生器阀、电机日精、芬德继电器、铝合金管道、大节距链条、精密万向轴、卧式减速器
- 主营：路开关、猴车轮、索道配、盘式制动器闸、密封圈、传感器、罐笼配、防挤绳、绳滑套、输送机、固定块、驱动轮、抱索器、摩擦块、联轴器、变压器、钢带机、刹车皮、连接件、导向管、液压站、发讯器、刹车片、轮衬块、摩擦垫、提升机
- 主营：盾构机模拟器、正面吊模拟器、越野叉车模拟器、盘式制动器拆装实训台、汽车驾驶模拟器、应急救援模拟器、工程机械模拟器、自卸车模拟器、重型机械化桥模拟器、焊接模拟器、平地机模拟器、压路机训练模拟器、山地挖掘机模拟器、叉车模拟器、汽车起重机模拟器、挖掘机模拟训练器材、重型支援桥训练模拟器、运输车模拟器、塔式起重机模拟机、港口机械模拟器、推土机模拟器、消防车模拟器、装载机模拟器、多用工程车模拟器、挖掘机模拟器、矿用卡车模拟器
- 主营：仟岱离合器、仟岱刹车器、电磁离合器、电磁制动器、磁粉制动器、永磁制动器、制动器、永磁刹车器、磁粉离合器、湿式多片电磁离合器、湿式多片电磁刹车器、电磁离合刹车器组合、安全刹车器、磁滞刹车器、离合器、停电刹车、失电刹车、断电刹车、电磁刹车、磁粉刹车、电机抱闸、电机刹车、仟岱牌刹车、机械手刹车
- 主营：离合器摩擦片、减速机摩擦片、湿式铜基摩擦片、制动器摩擦片、电机刹车片、摩擦片、摩擦块、刹车片
- 主营：斯德博伺服驱动器、电机减速机、DJS避雷器放电记录仪、制动器、阀门定位器、温控器、传感器、压力开关、指示器、称重模块、电磁阀、带电显示器、风机监视器