초록 ▼

An electric motor has a stator (224) having a bearing tube (238) made of a magnetically transparent material; it also has a rotor (222) having a rotor shaft (234) that is at least partially journaled in the bearing tube (238), and has a ring magnet (250) that is fixedly arranged on the rotor shaft (

An electric motor has a stator (224) having a bearing tube (238) made of a magnetically transparent material; it also has a rotor (222) having a rotor shaft (234) that is at least partially journaled in the bearing tube (238), and has a ring magnet (250) that is fixedly arranged on the rotor shaft (234) inside the bearing tube (238). Two magnetic-field-dependent analog sensors (248′, 248″) are arranged on a circuit board (246) outside the bearing tube (238), at an angular distance (PHI) from one another, in order to generate rotor position signals as a function of the rotational position of the ring magnet (250). A corresponding device (150) that serves to control the motor is provided, in order to process these rotor position signals into a signal that indicates the absolute rotational position of the rotor (222).

대표청구항 ▼

What is claimed is: 1. An electric motor comprisinga stator (124) having a bearing tube, which tube is implemented, at least in a subregion, from a magnetically transparent material;a rotor (38; 112) having a rotor shaft (40; 232) and having a rotor magnet (38; 228) having n pole pairs;a ring magnet

What is claimed is: 1. An electric motor comprisinga stator (124) having a bearing tube, which tube is implemented, at least in a subregion, from a magnetically transparent material;a rotor (38; 112) having a rotor shaft (40; 232) and having a rotor magnet (38; 228) having n pole pairs;a ring magnet fixedly connected to the shaft (40; 232), and arranged at least partially in the bearing tube, which magnet is magnetized in such a way that it has a maximum of n pole pairs, where n is a positive integer and that a substantially sinusoidal magnetic flux profile occurs at its circumference;at least one rotor position sensor (84′, 84″; 248′, 248″) for generating a rotor position signal that maps a property of the magnetic flux from said ring magnet and is suitable for ascertaining an absolute value of the rotor position, said at least one rotor position sensor being arranged outside the ring magnet (82; 250) being arranged at least partially between the rotor shaft (232) and the at least one rotor position sensor (84′, 84″; 248′, 248″).