Abstract:
In a method for operating an electronically commutated (EC) motor that has a primary part having a coil and a secondary part having magnet segments, a measuring sequence is determined that has a plurality of measured value combinations, which are a function of the relative position between secondary part and primary part and each of which includes a number of measured values that corresponds to the number of magnetic fields sensors that are used for the determination. The coil is supplied with power as a function of the measured value combinations. The absolute position of the secondary part is determined by positioning of the secondary part at a reference position and by an absolute position value being tracked at each change of the measured value combination starting from a reference position value. For a relative movement between the secondary part and the primary part oriented in a prescribed direction, a reference sequence is determined and stored in memory that comprises a plurality of setpoint value combinations to be cycled through in succession and has a number of setpoint values corresponding to the number of magnetic field sensors. Based on the reference sequence of the measured value combination that occurred at the reference position and the number of changes in the measured value combination that occurred, the setpoint value combination is determined and compared to the measured value combination determined for the relevant absolute position value. When a deviation occurs, a fault condition is detected.
Abstract:
A spatial detection apparatus comprising a rotating member having a predetermined number of teeth angularly spaced about its circumference at predetermined distances to form a bit pattern; at least one sensor capable of detecting a rising edge and a falling edge of the teeth; and a processor configured to detect at least a portion of the bit pattern based on inputs from the sensor.
Abstract:
In a method for operating an electronically commutated (EC) motor that has a primary part having a coil and a secondary part having magnet segments, a measuring sequence is determined that has a plurality of measured value combinations, which are a function of the relative position between secondary part and primary part and each of which includes a number of measured values that corresponds to the number of magnetic fields sensors that are used for the determination. The coil is supplied with power as a function of the measured value combinations. The absolute position of the secondary part is determined by positioning of the secondary part at a reference position and by an absolute position value being tracked at each change of the measured value combination starting from a reference position value. For a relative movement between the secondary part and the primary part oriented in a prescribed direction, a reference sequence is determined and stored in memory that comprises a plurality of setpoint value combinations to be cycled through in succession and has a number of setpoint values corresponding to the number of magnetic field sensors. Based on the reference sequence of the measured value combination that occurred at the reference position and the number of changes in the measured value combination that occurred, the setpoint value combination is determined and compared to the measured value combination determined for the relevant absolute position value. When a deviation occurs, a fault condition is detected.
Abstract:
A position sensing system, specifically for elevators, comprising at least one sensor which is able to move relative to a transducer for the sensor. According to the invention, a scale is provided as a transducer, to which scale a code (11-15, 19) detectable by the sensor is applied by which the position of the sensor relative to the scale is able to be measured. As a result, it is possible to detect the absolute height of the elevator car, with the result that, depending on the code, a high level of precision may be achieved. In addition, the position sensing system may be employed for automated start-up operation, and the data measured may be utilized both for the control equipment and to meet safety requirements.
Abstract:
A position measuring device that includes a scanning device and a measurement representation that is scanned by the scanning device. The measurement representation includes a code of a succession of code elements, which form at least a first codeword and a second codeword that define an absolute position, the first codeword and the second codeword are arranged interlaced with each other in that code elements associated with the second codeword are inserted into a succession of code elements associated with the first codeword. The code elements associated with the first codeword have inverse properties with respect to the code elements associated with the second code codeword.
Abstract:
A control part 7 detects pulse widths of four continuous pulses, and a pulse width w1 of a pulse detected first is compared in size with a pulse width w2 of a pulse detected second and when w2 is larger, normality is determined. The pulse width w2 of the pulse detected second is compared in size with a pulse width w3 of a pulse detected third and when w3 is larger, normality is determined. The pulse width w3 of the pulse detected third is compared in size with the pulse width w1 of the pulse detected first and when w1 is larger, normality is determined. In the above first to fourth determinations, when the number of cases determined as normality is two times or more, normal rotation is determined, and otherwise, reverse rotation is determined.
Abstract:
There is provided a position transducer (1) capable of accurately detecting an n-bit code by n ABS detectors from one ABS track. When an INC value is under j or over k, signal output from each of the ABS detectors is binarized based on a threshlold h and also based on a threshold l. First, an ABS value decider (24) decides that a bit is nullHnull when it has been judged as being nullHnull on the basis of both the thresholds and a bit is nullLnull when it is has been judged as being nullLnull on the basis of both the thresholds. When the INC value is under j, a lower bit has the same code as that of the deiced bit. So, the ABS value decider (24) decides that the lower bit is nullHnull or nullLnull. On the other hand, when the INC value is over k, an upper bit has the same code as the decided code. Thus, the ABS value decider (24) decides that the upper bit is nullHnull or nullLnull. The ABS value decider (24) decides a yet-to-decide bit to be nullLnull when a bit adjacent to the bit is nullHnull, and nullHnull when the adjacent bit is nullLnull.
Abstract:
A control part 7 detects pulse widths of four continuous pulses, and a pulse width w1 of a pulse detected first is compared in size with a pulse width w2 of a pulse detected second and when w2 is larger, normality is determined. The pulse width w2 of the pulse detected second is compared in size with a pulse width w3 of a pulse detected third and when w3 is larger, normality is determined. The pulse width w3 of the pulse detected third is compared in size with the pulse width w1 of the pulse detected first and when w1 is larger, normality is determined. In the above first to fourth determinations, when the number of cases determined as normality is two times or more, normal rotation is determined, and otherwise, reverse rotation is determined.
Abstract:
The invention relates to an adaptive absolute steering sensor for the absolute determination of a turning angle, especially for determining the steering angle in a motor vehicle by way of a code applied across a 360° angular range for a determining the angle. The code and a sensor system are arranged in such a way that they are able to rotate in relation to each other. Absolute determination of the angle is carried out by reading the contrast information using a micro processor which determines both the angular position of the code and the fine resolution of the angles on the basis of the relative position of the recognized angle to the image on the photodetector system. At the same time the overall function of the system is verified and adjusted during each measurement. The code is determined using a photodetector system positioned in a single place, and used for determining the angle, whereby an unbroken segment of code track is shown on at least one photodetector line and at least one code word is detected to which corresponds a predetermined angle. The position of the code word in relation to the fixed position of the photodetector line is measured.
Abstract:
An apparatus for determining the position of a mechanical element wherein the mechanical element is marked in an optically readable manner, comprising reading means to provide a first output dependent on the position of the mechanical element.