Control process for an electric motor having permanent magnet rotor stator winding and end stage changes commutator time period as function of voltage signal to be adapted to rotor speed

摘要

A control process for an electric motor with a permanent magnet rotor comprises defining a commutation time period during which the induced magnetic field direction is constant and in which commutated disconnection (107) and connection (109) occur. The winding current is constant outside this period and the commutation time period changes as a function of the determined voltage (U2) to adapt to the rotor speed. A control process for an electric motor comprising a permanent magnet rotor, stator with winding and an end stage affecting the winding current comprises defining a commutation period from a given commutated time period (T-K) during which the induced magnetic field direction is constant and in which commutated disconnection (107) and connection (109) occur and that starts and ends at given time points (tK(n), tK(n + 1)). Outside these processes there is a constant winding current and the dependent voltage signal (U2) is determined. The commutation time period changes as a function of the voltage signal to be adapted to the rotor speed. Independent claims are also included for the following: (A) An electric motor for the above process;and (B) A fan having an electric motor as above.