Abstract:
A drive device of an elevator includes a DC bus, a motor bridge connected to the DC bus for the electricity supply of the elevator motor, a control circuit with which control circuit the operation of the motor bridge is controlled by producing control pulses in control poles of high-side and low-side switches of the motor bridge, a brake controller, which comprises a switch for supplying electric power to an electromagnetic brake, a brake control circuit, with which the operation of the brake controller is controlled, an input circuit for the safety signal to be disconnected/connected from outside the drive device, drive prevention logic and brake drop-out logic connected to the input circuit and configured to prevent the passage of control pulses to the control poles of the high-side and/or low-side switches when the safety signal is disconnected.
Abstract:
The invention relates to an elevator system and also to an electricity supply device (1, 2, 3) for supplying electric power in the elevator system. The electricity supply device (1, 2, 3) comprises a controllable power output stage (4, 5), comprising a connection to the load (6, 7, 8) of the elevator system to be supplied. The power output stage (4, 5) comprises one or more controllable solid-state switches (9) in the form of silicon carbide (SiC) solid-state switches.
Abstract:
The invention relates to a method and to devices for starting up an electric drive (1) of an elevator. In the method a sensor (2) that detects the direction of movement of the elevator car is fitted into the elevator system, the elevator car (3) is brought into a state of movement, the direction of movement (5) of the elevator car (3) is detected from the measuring signal of the aforementioned sensor (2) that detects the direction of movement of the elevator car and also the drive direction (6) of the electric drive is connected in the control (4, 14) of the electric drive to the detected direction of movement (5) of the elevator car.
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:
The invention relates to a determination (1 ) of the loading state of an elevator system and also to a method for determining the loading state of an elevator system. The elevator system comprises an elevator car (2) and also a motor drive (3) for moving the elevator car. In the invention the loading state of the elevator system is determined on the basis of the position deviation (4) of the elevator motor that occurs during the determination of the loading state.
Abstract:
The invention presents a control arrangement of an electric motor (2) used with a frequency converter (1 ) as well as a method for controlling an electric motor used with a frequency converter. In the invention the frequency converter is fitted between the power source (3) and the electric motor (2). A rectifier (5, 18) that transmits the braking power of the motor is fitted to the intermediate circuit (8, 9) of the frequency converter. In the method according to the invention the intermediate circuit voltage (21) is regulated with a control (11) of the braking power according to the reference value (12) of intermediate circuit voltage.
Abstract:
The invention concerns a method and an apparatus for controlling a three-or-more-phase motor (2) driven by a frequency converter (1). In the method, a change-over switch (3) of the frequency converter is controlled to a continuously conducting state (12,24) and at the same time the phase voltages or phase currents of the other phases are controlled by switching the change-over switches (3) in those motor phases at a switching frequency substantially higher than the frequency of the fundamental wave of the phase voltage or phase current. The apparatus comprises in conjunction with the frequency converter (1) a number of change-over switches (3), at least one change-over switch for each motor phase (17). The change-over switches comprise controllable change-over contacts (4,13). The apparatus further comprises in conjunction with the frequency converter means (5) for determining the motor phase currents and means (6) for controlling the change-over contacts.
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).