| 摘要 |
A linear actuator comprising a spindle nut, where the spindle nut and the spindle between a first and a second point, indicating the length of stroke, can move axially in proportion to each other, depending on whether the spindle or the spindle nut is being driven around via the transmission, and where the position is determined with incremental position sensors, such as at least two Hall sensors or Reed-switches. For determining the position an initiating procedure, where the nut/spindle is moved from a first point on the spindle/nut to a second point on the spindle nut, is carried out, and that the number of pulses from the incremental position sensors appearing by it are registered as a measurement for the length of stroke, and the position is subsequently determined in relation to that. It is noted that the control is active before, during and after the operation of the motor. Hereby, absolute position detection is achieved with incremental sensors, where one formerly was obliged to use rotary potentiometers. Simultaneously an optional determination of the length of stroke and its position and immediate possibility to change the same at any time is achieved. |
