Brushless direct current motor with internal and external rotors and without core losses

Abstract

The invention provides a brushless direct current motor without core losses, comprising outer Halbach magnets, inner Halbach magnets, a rotor shaft and coreless stators formed by windings and frameworks, wherein the outer Halbach magnets and the inner Halbach magnets are connected on the rotor shaft by magnet isolating sleeves so that the outer Halbach magnets and the inner Halbach magnets rotate synchronously with the rotor shaft; the coreless stators are installed and fixed on casings; the outer Halbach magnets, the coreless stators, the inner Halbach magnets and the air gaps among the magnets and the coreless stators form closed magnetic circuits; and sinusoidal magnetic fields with high density are formed between the outer Halbach magnets and the inner Halbach magnets. The motor provided by the invention removes the stator cores and the rotor cores so that the rotors do not have core losses at any working speed, thus radically solving the problem of core losses, and the motor simultaneously has the advantages of light weight, low power consumption, reliable structure and the like.

Description

Technical field: [0001] The invention relates to a brushless direct current motor, in particular to a brushless direct current motor without iron core loss, which can be applied to occasions such as high speed and low power consumption. Background technique: [0002] The body of a traditional brushless DC motor mostly contains a stator core and a rotor core. When the motor is running, the magnetic field in the stator core and the rotor core changes alternately, resulting in hysteresis loss and eddy current loss, and these losses increase with the increase of the rotor rotation frequency. And surge. When the traditional brushless DC motor is used in high-speed rotating occasions, the core loss of the motor is large and the efficiency is low. In addition, due to the existence of stator cogging, when the rotor rotates at high speed, cogging torque and tooth harmonics will be generated, which will cause a certain pulsation of torque and cause a part of loss. Although the non-c...

AI Technical Summary

Problems solved by technology

When the traditional brushless DC motor is used in high-speed rotation occasions, the core loss of the motor is large and the efficiency is low

In addition, due to the existence of stator cogging, when the rotor rotates at high speed, cogging torque and tooth harmonics will be generated, which will cause a certain pulsation of the torque and cause a part of the loss

Although the non-cogging brushless DC motor can eliminate the cogging torque and tooth harmonics, making the rotor rotation more stable, but due to the existence of the stator core, the loss of the stator core still exists

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