The speed measurement in the permanent magnetization type electric synchronous machine

摘要

The instrument has two sensors (25, 31), where the sensor (25) has a sensor coil, and the sensor (31) is a Hall sensor. The sensors are attached at a primary part of an electrical synchronous machine such that the sensors are influenced by a magnetic field produced by a permanent magnet (19). The sensors produce a signal that is proportional to a number of revolutions and speed of machine, and the sensors are connected to an evaluator. Independent claims are also included for the following (A) a primary part of a permanently actuated electrical synchronous machine (B) a method of measuring a speed of a permanently actuated electrical machine.