Abstract:
In the regulation system of the invention, the longitudinal current id in a permanent magnet synchronous motor is adjusted to zero. In the regulation, the third harmonic of the control signal can be added to the result of a coordinate system transformation of the control voltages. In a regulator for a permanent magnet synchronous motor, a 3-phase reference for the motor supply voltage is formed from the uq and ud voltages by transforming them to produce components corresponding to each phase and by combining the components for each phase.
Abstract:
A procedure for determining the position of an elevator car in which the code data contained in code units mounted in the building is read by means of a code data detector unit (4) in such manner that a code unit containing floor data and door zone data is mounted essentially close to the threshold of the landing door on each floor and that the detector unit reading the floor data and door data is mounted essentially close to the threshold of the car.