Abstract:
The invention discloses a protection of an elevator and a method for protecting an elevator, in which the elevator comprises a machinery brake (7), a safety brake (8) of the elevator car (10), and an electrical drive (1) comprising an elevator motor (3) and a power supply appliance (2) of the elevator motor (3). The protection of the elevator comprises restriction of the output of the electrical drive (1) on the basis of the determined limit value (27, 28) for the stator voltage and/or the stator current of the elevator motor (3) and restriction of the movement (12, 29) of the elevator car (10) on the basis of at least one determined limit value (13, 14, 30, 31, 32) for permitted movement of the elevator car (10). At least one limit value for permitted movement of the elevator car (10) is determined at least partly on the basis of the limit value (27, 28) for the stator voltage and/or the stator current of the elevator motor (3) and the elevator car (10) is fitted to move with a restricted movement during the restriction of the movement of the elevator car (10).
Abstract:
The invention concerns a method and apparatus (28) for determining an angle (9) by means of a resolver (3). In the method, an excitation signal (29) of constant frequency is supplied to the resolver (3), the resolver response signals (13, 14) are measured, successive (16) measurements of each response signal are stored into a sample buffer (5), FIR filtering (10) is computed for the response signal values (16) present in the sample buffer (5) at the instant of computation, the computation points (23, 24) and the set of computation result values (18) corresponding to these points are stored in memory, at least two sets of values (18, 19) of computation results are compared to each other and of these the value set Amax (19) which contains the highest computation result as an unsigned value is selected, and FlR filtering (10) is repeatedly computed at the computation points (25, 26) corresponding to value set Amax (19).
Abstract:
Methods and an apparatuses for determining the movement of a synchronous machine are provided. An apparatus for determining the movement of a synchronous machine includes a determination for at least one electrical magnitude of the synchronous machine; a determination of the position error of the rotor of the synchronous machine, which is fitted to determine the position error of the rotor on the basis of the aforementioned at least one electrical magnitude of the synchronous machine; and also a correction of the movement signal of the incremental sensor, which is fitted to correct the read movement signal of the incremental sensor on the basis of the aforementioned determination of the position error of the rotor of the synchronous machine.
Abstract:
An elevator system and a method for monitoring the operating condition of an elevator system are provided. In the method, samples are taken of the control signal of the drive device of the elevator, from the series of samples taken a frequency component is determined that is characteristic to the part of the elevator assembly driven with the drive device, and also the operating condition of the part of the elevator assembly is monitored on the basis of the determined frequency component.
Abstract:
In a method for limiting loading of an elevator assembly, a limit value for a maximum permitted loading is set for one or more parts of the elevator assembly, and a loading of the one or more parts of the elevator assembly is determined. A movement magnitude value of the elevator car in the movement profile of the elevator car is modified to limit the loading of the one or more parts of the elevator assembly if the loading of the one or more parts of the elevator assembly exceeds the limit value for the maximum permitted loading.