SI22078A2 - New concept of a magnetic induction probe system for detecting magnetic fields on the internal side of the bottom of the external rotor of an electronically commutated drive with permanent magnets onthe external rotor - Google Patents

Abstract

The use of a special concept of a magnetic induction probe system for detecting magnetic fields solves the problem of the impact of negative jamming in the sense of magnetic interference between the current inducing the magnetic field through an electronically commutated machine with permanent magnets on the external rotor and the magnetic field of the inducing magnetic system for triggering magnetic field detection probes. There is an induction system magnetized alternatively from the opposite side made from hard-magnetic material in the shape of a uniform ring (G) or a segment-like magnetic ring (G) attached to the internal bottom (A2) of the external rotor (A). The sequence of magnetic polarisation of such rings (G) can be equal or opposite compared to the magnetizing direction of the permanent magnets (B). There can also be several of such rings (G) polarised this way. All of them are attached to the internal bottom (A2) of the external rotor (A). Apart from the aforementioned, magnetic disks (G) polarized by any number of magnetic poles can be attached to the internal bottom (A2) of the external rotor (A). On the internal side of the stator (C) there is a probe (K) system (H) for the detection of a magnetic field. At the bottom of system (H) there is on the side looking towards the stator (C) a ferromagnetic protection (L) for the protection against the dissipated magnetic field by the stator induction currents. In the case of larger numbers of magnetic rings (G) there are several of such systems (H) at the bottom (A2) of the stator. The systems (H) can include one or several of such probes (K) for the acquisition of the magnetic field.

Description

ELECTRONIC SWITCHED MACHINE WITH PERMANENT MAGNETS ON THE OUTER ROTOR

The subject matter of the invention is electronically switched permanent magnet machines on an external rotor.

Basically, electronically switched machines with permanent magnets on the outer rotor consist of an internal stator and in the same geometric axis of the rotating outer rotor. Permanent magnets of suitable dimensions are attached to the inner circumference of the rotor. The stators consist of a large number of poles. Among the stator poles are grooves into which the stator excitation windings are inserted. Stator windings can be one, two, three or more phase. The correct switching (switching) of excitation currents is ensured by the control and control electronics. It receives the trigger pulses from the magnetic field probe system. Magnetic field detection probes must be mounted in the correct positions and in the correct order. The excitation magnetic actuation system for the Hall probe actuation shall be so arranged that no magnetic interference occurs between the magnetic field of the excitation current through an electronically switched machine with permanent magnets on the external rotor and the magnetic field of the excitation magnetic actuator system for triggering magnetic field probes.

The contents of the patent application will relate to the magnetic excitation system of magnetic field probes on the inside of the bottom of the outer rotor, the position of the excitation system and the position of the magnetic field probes in such system.

A technical problem solved by the invention is the construction of a magnetic excitation system of magnetic field probes on the inside of the bottom of the outer rotor, the position of the excitation system and the position of magnetic field probes in such a system of electronically switched permanent magnet machine on an external rotor with which negative interference will be eliminated in terms of magnetic interference between the magnetic field of the excitation current through an electronically switched permanent magnet machine on the external rotor and the magnetic field of the excitation magnetic system for triggering magnetic field probe detectors.

The classical position of magnetic field sensing probes located on the outside of the stator in the middle of the stator half feet is known. For the excitation magnetic system, however, the magnetic field of permanent magnets on the inner circumference of the outer rotor of an electronically switched machine with permanent magnets on the outer rotor is used.

There is a known solution according to patent EP 1048845A1. Here, magnetic field detection probes are placed in the groove between the ferromagnetic perimeter of the flywheel and the permanent magnets on the inner perimeter of the outer rotor. The groove is located at the top edge of the flywheel.

Also known is EP 1321667A1. A foreign excitation magnetic actuator system mounted on the flywheel hub in the form of a ring. Magnetic field detection probes, however, are located near the stator yoke and are triggered by a radial magnetic field excitation magnetic excitation system.

According to the invention, the problem of negative interference in terms of magnetic interferences between the magnetic field of the excitation current through an electronically switched machine with permanent magnets on the external rotor and the magnetic field of the excitation magnetic actuator system for triggering the magnetic field probes is solved by the construction of the magnetic excitation system of probes for magnetic field detection on the inside of the bottom of the outer rotor, the position of the excitation system and the position of the magnetic field probes in such a system of electronically switched machine with permanent magnets on the outer rotor. The invention will be described in the embodiment and in the drawings showing:

Fig. 1 is a cross-sectional view of the entire electronically switched permanent magnet machine on the outer rotor. 2 is a side sectional view of an external rotor of an electronically switched permanent magnet machine on an external rotor; FIG. 3 is a side sectional view of a stator of an electronically switched permanent magnet machine on an external rotor; FIG. 4 is a side sectional view of an external rotor and a stator of an electronically switched permanent magnet machine on an external rotor; FIG. 5 is a cross-sectional view of an external rotor of an electronically switched permanent magnet machine on an external rotor with an excitation magnetic system for triggering probes for magnetic field detection. FIG. 6 is a cross-sectional view of an external rotor of an electronically switched permanent magnet machine on an external rotor with an excitation magnetic system for triggering magnetic field probes and position of magnetic field detection probes

An electronically commutated machine with permanent magnets on the outer rotor forms an outer rotor assembly in the form of a pot (A) of ferromagnetic material to which the inner circumference is attached to permanent magnets (B) and a ferromagnetic laminated stator (C) with excitation windings (D). Figure 1 shows only one stator excitation coil (D).

The outer rotor (A) consists of a circumferential part (Al), a bottom (A2) and a hub (A3). A magnetically excited excitation system of rigid-magnetic material is attached to the inner bottom (A2) of the outer rotor (A) in the form of a single coil (G) or a segmented coil (G). Such a magnetized coil is a magnetic image of permanent magnets (B) attached to the inner circumference (Al) of the outer rotor (A). The magnetic polarization sequence of a single magnetic coil (G) or a segmented coil (G) may be the same or opposite in relation to the magnetization of permanent magnets (B). There can be more polarized (G) rings in this way and in this way. All of them are attached to the inner bottom (A2) of the outer rotor (A). In addition to the alternately opposite direction of a uniform magnetized coil (G) or a segmentally made coil (G), or coils, a single magnetic coil (G) or a segmentally made coil (G) can be attached to the inner bottom (A2) of the outer rotor (A). with any number of magnetic poles.

A system (H) of probes (K) for magnetic field detection is mounted on the inside of the stator (C). At the bottom of the system (H), a ferromagnetic shield (L) is mounted on the anti-stator side (C) to protect against the shaky magnetic field of the stator excitation currents. In the case of n numbers (where n is an integer naturally) of magnetic rings (G) or segmentally made rings (G), there may be n such systems (H) at the bottom (A2) of the stator. Systems H may contain m numbers (where m is an integer naturally) of magnetic field capture probes (K), depending on the structure of the electronically switched permanent magnet machine on the outer rotor. Magnetic coil magnetic field capture probes (K) are used to control or regulate an electronically switched permanent magnet machine on an external rotor or other devices connected to an electronically switched permanent magnet machine on an external rotor.

Claims (8)

PATENT APPLICATIONS 1. Electronically commutated permanent magnet magnet machine on an external rotor comprising permanent magnets and an internal stator with an electrical winding having a magnetic excitation system, characterized in that it alternately opposes on the inside at the bottom (A2) of the outer rotor (A) direction magnetized uniform magnetic ring (G) made of solid magnetic material, the orientation of magnetization equals the magnetization of permanent magnets (B) on the circumference (Al) of the rotor (A). Machine according to claim 1, characterized in that, on the inside, on the bottom (A2) of the outer rotor (A), a magnetically segmented magnetic ring (G) made of solid material is alternately opposite in direction, the magnetization orientation being the same as the magnetization of permanent magnets. (B) at the circumference (Al) of the rotor (A). Machine according to claim 1 and claim 2, characterized in that the magnetization coil magnetization orientation (G) is shifted 180 ° to the permanent magnet magnetization orientation (B) at the circumference (Al) of the rotor (A). Machine according to claim 1, claim 2 and claim 3, characterized in that it has a greater number of magnetic rings (G). Machine according to claim 1, claim 2 and claim 4, characterized in that it has any sequence of magnetic magnetization coils (G). Machine according to claim 5, characterized in that it has any number of magnetic poles. Machine according to claim 6, characterized in that it has n systems (H) with m probes (K) for capturing the magnetic field. Machine according to claim 7, characterized in that it has a ferromagnetic shield (L) at the bottom of the systems (H).