BG113235A - Methods and devices for controlling the unwinding and rotation of the rotor of permanent magnet electrical machines by switching a magnetic core from an active through an intermediate state to a passive state or vice versa - Google Patents

Abstract

A novel method and devices for controlling the unwinding and rotation of a rotor of permanent magnet electrical machines by switching a magnetic core from an active state through an intermediate state to a passive state or vice versa is provided. The active state is understood to be when the magnetic field of a permanent magnet covers both a part of the stator and a part of the rotor of the electrical machine, and the passive state is understood to be when the magnetic field of a permanent magnet is concentrated only in a part of the rotor or stator depending on where it is located. The technical essence of the proposed method lies in neutralizing the resistive effect of the magnetic field of the permanent magnets during the rotation of the rotor after the magnetic field created by the electrical part of the electrical machines is switched off.

Description

METHODS AND DEVICES FOR CONTROLLING THE ROTATION AND ROTATION OF THE ROTOR OF ELECTRIC MACHINES WITH PERMANENT MAGNETS BY SWITCHING THE MAGNETIC CIRCUIT FROM ACTIVE THROUGH AMONG

FIELD OF TECHNOLOGY

The invention relates to a method and devices for controlling, rotating and rotating a rotor of electric machines with permanent magnets by switching a magnetic circuit from active through intermediate to intermediate in passive state or vice versa.

Active state means when the magnetic field of a permanent magnet covers part of the stator and part of the rotor of the electric machine, and passive state means when the magnetic field of a permanent magnet is concentrated only in part of the rotor or stator, depending on where it is located. The part of the scattering is neglected, as its quantity is determined by the design features of the machine.

BACKGROUND OF THE INVENTION

There is a method for controlling the rotation and rotation of the rotor of electric machines, a method for maintaining the rotation of the rotor of an electric motor with permanent magnets by continuously consuming electricity.

The disadvantage of the known methods is the continuous consumption of electricity and this reduces the efficiency of electric motors with permanent magnets.

TECHNICAL SUMMARY OF THE INVENTION

The technical essence of the proposed method is to neutralize the resistance of the magnetic field of permanent magnets when rotating the rotor after turning off the magnetic field generated by the electrical part of electrical machines in the case of:

- when the speed of the electric motors has reached a preset value.

- when the speed of the electric generators must reach a preset value.

i.e. connection or release of the rotation of the rotor of the electric machine from the influence of the magnetic field of the permanent magnets is performed

The switching is performed by the moments Μι in FIG. 1 and FIG. 2 and M2 of FIG. 3 and FIG. 4 the magnetic conductors of the permanent magnets from active through intermediate to passive or vice versa.

DESCRIPTION OF THE ATTACHED FIGURES

Variant "A" with permanent magnets in the stator, shown by partial section in axonometry in Fig. 1 and FIG. 2, and variant “B” with permanent magnets in the rotor, shown by partial section in axonometry of FIG. 3 and FIG. 4, where the positions are:

- schematic representation of the magnetic field of permanent magnets

- permanent magnets marked N - north pole and S south pole

- electrical part located in the rotor

- magnetic conductor forming the stator pole in active mode and switched from moment Ml

- main magnetic conductor of the stator

- magnetic circuit of the electrical part (rotor) of the electrical machine

- electrical part located in the stator

- main magnetic conductor of the rotor

- magnetic conductor forming the rotor pole in active mode and switched from moment M2

- magnetic conductor of the electrical part (stator) of the electrical machine

The switching is performed by the moments Μι in FIG. 1 and FIG. 2 and M2 of FIG. 3 and FIG. 4 of the magnetic conductors of the permanent magnets from active through intermediate to passive or vice versa

EXAMPLES OF SPECIFIC IMPLEMENTATION

Created by the proposed method of construction (electric machines with permanent magnets by switching the magnetic circuit from active through intermediate to passive or vice versa) are two options. Option A with permanent magnets in the stator shown in FIG. 1 and FIG. 2 and variant B with permanent magnets in the rotor shown in FIG. 3 and FIG. 4

APPLICATION OF THE INVENTION

Applied in an electric motor will be used to drive structures in all areas of application.

Applied in a generator will be used to generate the electromotive voltage (EMF) required for all areas of application

Claims (1)

Method of controlling the rotation and rotation of the rotor of electric machines is permanent magnets by switching the magnetic circuit from active through intermediate to passive or vice versa, characterized by to neutralize the resistance of the magnetic field of permanent magnets when rotating the rotor after turning off the magnetic field created by the electrical part of the electrical machinery in the case of: when the speed of the electric motors has reached a preset value. when the speed of the electric generators must reach a preset value (rotation of the generators). i.e. connection or release of the rotation of the rotor of the electric machine from the influence of the magnetic field of the permanent magnets is performed. Devices, in two variants: Option A with a switching magnetic conductor located in the stator of the electric machine, by moment Μι from active through intermediate to passive state or vice versa. Option B with a switching magnetic conductor located in the rotor of the electric machine, by moment Μι from active through intermediate to passive state or vice versa.