Hall permanent magnet brushless high-speed direct current motor for vacuum molecular pump

Abstract

The invention relates to a hall permanent magnet brushless high-speed direct current motor for a vacuum molecular pump. The hall permanent magnet brushless high-speed direct current motor comprises a motor rotor and a motor stator, wherein the motor rotor comprises an alloy steel mandrel, a permanent magnet and an alloy sheath; the motor stator comprises a stator core, a solenoid winding, an outgoing line, a hall element, a hall sensor, a hall circuit board, a hall mounting base, epoxy resin and an outer motor sleeve; the hall mounting base is located at one side, toward the outgoing line, of the stator core; a pin of the hall element is welded to the hall circuit board; a copper screen shielding layer coats the periphery of the hall circuit board; the opposite position of the hall sensor is rigidly fixed through the hall mounting base; a signal line of the hall sensor is arranged at one end of the outgoing line; a heavy-current motor three-phase current outgoing line is arranged at the other end of the outgoing line; a shield protection sleeves the outgoing line of the hall sensor; the motor stator is filled and sealed by the epoxy resin after being installed; and the outer motor sleeve is used for ensuring the assembly accuracy of the motor stator.

Description

technical field [0001] The invention relates to a vacuum molecular pump, in particular to a Hall permanent magnet brushless direct current high-speed motor for the vacuum molecular pump. Background technique [0002] The existing vacuum molecular pump is a mechanical vacuum pump, which is pumped through the combination of high-speed rotating multi-stage turbine rotor blades and stationary turbine blades, and generates a high compression ratio for the pumped gas in the molecular flow region, thereby Get the high vacuum and ultra-high vacuum performance you need. The pumping mechanism of the molecular pump is that in the molecular flow area, the rigid body surface moving at high speed transmits momentum to the gas molecules, so that the gas molecules generate directional flow in the movement direction of the rigid body surface, so as to achieve the purpose of pumping. It can be seen that the rotor blade of the molecular pump must have a linear velocity similar to that of the ...

AI Technical Summary

Problems solved by technology

The Hall element used in the Hall permanent magnet brushless DC motor is easily disturbed by the electromagnetic field generated by the three-phase current of the motor, and the Hall element is not easy to install and fix in the motor stator, which makes the mass production of this motor very difficult

Images