A low-power high-speed double-turn magnetic steel brushless DC motor

Abstract

The invention discloses a low-power-consumption high-speed double-ring magnetic steel brushless direct current motor. The motor comprises a rotor system and a stator system. The rotor system includes:an outer mounting sleeve, an outer magnetic conductive ring, outer parallel magnetizing magnetic steel, outer upper 45-degree magnetizing magnetic steel, outer lower 45-degree magnetizing magnetic steel, an outer magnetic steel lock nut, an outer assembly lock nut, a rotor shell, an inner mounting sleeve, an inner magnetic conductive ring, inner parallel magnetizing magnetic steel, inner upper 45-degree magnetizing magnetic steel, inner lower 45-degree magnetizing magnetic steel, an inner magnetic steel sheath, an inner magnetic steel lock nut and an inner assembly lock nut; the stator systemcomprises a hollow cup stator framework, a stator aluminum substrate, a winding and epoxy resin glue. According to the invention, a double-ring axial Halbach magnetic steel structure without a statorcore is adopted, magnetic hysteresis loss caused by a fixed iron core and torque pulsation caused by tooth grooves are eliminated, eddy current loss is reduced, the upper portion and the lower portion of the inner-ring magnetic steel and the lower portion of the outer-ring magnetic steel are each provided with a 45-degree magnetized magnetic steel, the magnetic circuit magnetism gathering effectis achieved, the air gap flux density is increased, the air gap flux density flat top width is widened, and the output torque and the output torque precision are improved.

Description

technical field [0001] The invention relates to a double-circle magnetic steel brushless DC motor with low power consumption and high speed, in particular to a motor with axial Halbach magnetic circuit configuration, strong air gap magnetic density, wide flat top width of air gap magnetic density, and high torque Large, high-precision, double-turn magnetic steel brushless DC motor, especially suitable for the driving mechanism of the momentum wheel rotor. Background technique [0002] The momentum wheel is the key actuator for spacecraft attitude control. It has outstanding advantages such as low power consumption, long life, and high precision. The motor drives the flywheel rotor to accelerate or decelerate, and outputs high-precision control torque to achieve spacecraft attitude control and attitude stability. As the core component to control the speed of the momentum wheel, the motor determines the speed tracking accuracy and steady speed accuracy of the rotor, and is the...

AI Technical Summary

Problems solved by technology

However, the air gap flux density of this solution is still not large enough, and the trapezoidal magnetic steel used is difficult to manufacture and the manufacturing cost is high

Images