Sensor mit Energy Harvesting

Abstract

A sensor (12) configured to interact with a motor-driven device (14) which generates a time-varying magnetic field (26) during operation, the sensor (12) comprising: a measuring unit (16) configured to detect parameters (18) of the motor-driven device (14), and a power supply unit (20) having a moving magnet (28) movably mounted on a track (30) and an induction coil (34) arranged around the track (30), the moving magnet (28) being configured to move through the induction coil (34) on the track (30) in interaction with the time-varying magnetic field (26) of the motor-driven device (14), thereby generating a current in the induction coil (34) for supplying power to the measuring unit (16).

Claims

[1] A sensor (12) adapted to cooperate with a motor-driven device (14) which generates a time-varying magnetic field (26) during operation, the sensor (12) comprising: - a measuring unit (16) which is designed to record parameters (18) of the motor-driven device (14), and - a power supply unit (20) having a moving magnet (28) movably mounted on a track (30) and an induction coil (34) arranged around the track (30), wherein the moving magnet (28) is configured to move on the track (30) through the induction coil (34) in interaction with the time-varying magnetic field (26) of the motor-driven device (14) and thereby generate a current in the induction coil (34) for supplying power to the measuring unit (16). [2] Sensor (12) according to claim 1, wherein the energy supply unit (20) has a track guide (32) which is adapted to guide the running magnet (28) on the track (30). [3] Sensor (12) according to claim 1 or 2, wherein the running magnet (28) is movable cyclically, in particular oscillatingly, on the track (30). [4] Sensor (12) according to one of the preceding claims, wherein the track (30) is limited at the end by means of stop elements (36) which are arranged on opposite sides (37) of the induction coil (34). [5] Sensor (12) according to claim 4, wherein one or more of the stop elements (36) are spring-elastic. [6] Sensor (12) according to one of the preceding claims, comprising an energy storage unit (42) which is configured to store energy supplied by the energy supply unit (20) and to supply the measuring unit (16) with the stored energy. [7] Sensor (12) according to one of the preceding claims, comprising a control unit (44) which is configured to switch the measuring unit (16) between an activation state and a sleep state, wherein the measuring unit (16) is configured to detect the parameters (18) of the motor-driven device (14) in the activation state, and wherein the measuring unit (16) in the activation state has a higher power consumption L A as a power consumption L S in the sleep state. [8] Sensor (12) according to claim 7, wherein the amount of power output L E of the power supply unit (20) is greater than the amount of power consumption L S the measuring unit (16) in the sleep state and less than the amount of power consumption L A the measuring unit (16) is in the activation state. [9] Sensor (12) according to claim 7 or 8, wherein the control unit (44) is configured to switch the measuring unit (16) from the sleep state to the activation state after a sleep period Δts and after an activation period Δt A from the activation state to the sleep state, where the sleep period Δt S greater than the activation time Δt A is, in particular at least five times, at least 10 times, at least 15 times, at least 20 times, at least 40 times, at least 100 times, at least 500 times, at least 1000 times, at least 1200, at least 2000 times, at least 2400 times or at least 3000 times greater. [10] Sensor (12) according to one of claims 7 to 9, wherein the control unit (44) is arranged to determine the activation period Δt A and / or the sleep time span Δt S depending on the energy stored in the energy storage unit (20). [11] Sensor (12) according to one of the preceding claims, with a communication unit (46) which is designed to wirelessly transmit and / or read out the parameters (18) detected by the measuring unit (16). [12] Sensor (12) according to one of the preceding claims, comprising an adapter unit (48) for releasably attaching the sensor (12) to the motor-driven device (14). [13] System (10) comprising the sensor (12) according to any one of the preceding claims and the motor-driven device (14). [14] System (10) according to claim 13, wherein the motor-driven device (14) comprises a motor (22) and a drive magnet (24) which is coupled for movement to the motor (22) and is adapted to move driven by the motor (22) and thereby generate the time-varying magnetic field (26). [15] System (10) according to claim 14, wherein the drive magnet (24) moves the traveling magnet (28) at least twice on the track (30) through the induction coil (34) per revolution of the drive magnet (24) about a rotation axis (40).

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