Compact SKF Sensor-Bearing Units are built to determine the exact motion status of rotating or axially traveling components in open-loop and closed-loop motion control systems. Engineers can depend on these “intelligent,” cost-effective units to record data such as number of revolutions, speed, direction of rotation, relative position/counting, and acceleration or deceleration. Features include uniform and high signal quality, minimal liability to interference, and insensitivity to vibration or high temperatures. The units are ideally suited for applications such as electric motors, linear actuators, steering systems, conveying and handling systems, and automation equipment. With an SKF Explorer-class single-row deep groove ball bearing and an SKF active sensor at its core, each SKF Sensor-Bearing Unit is simple, lightweight, and robust in construction. In addition to its ability to withstand high speeds, the ball bearing can accommodate radial loads and locate the shaft axially in both directions. The ball bearing is sealed for protection and well lubricated, eliminating the need for relubrication during its intended lifespan. The active sensor consists of a magnetized impulse ring attached to the inner ring of the unit, a sensor body with Hall sensors carried by the outer ring, and connecting cable. To protect it against external electromagnetic influences, the active sensor is shielded. The bearing unit can record speeds as low as zero during operation. This process consists of the unit’s impulse ring moving past the stationary sensor ring when the inter ring rotates. This motion generates a magnetic field of changing polarity. The sensor then transmits a pulse, which is based on the number of polarity changes per second. The sensor output signal is transmitted through the connecting cable to generate the specified application information. Viable alternatives to incremental encoders, patented SKF Sensor-Bearing Units are available in a range of bore sizes and dimensions. However, the manufacturer can also produce custom units to meet specific customer requirements.
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