Bearingless electrical motor

1.

BEARINGLESS ELECTRICAL
MOTOR
Pskov State University
Loginov Sergei

2.

Problems of use mechanical bearing
Scope
High-speed motors
Corrosion environment
Ultrapure technologys and vacuum
Problems
Intens wear
Corrosion of bearings
Presence oil
Solution - contactless electromagnetic suspension
Advantages depend on absence
mechanical contact
Advantages depend on control system
*Absence wear (unlimited resource)
*Possibility operation in extreme
conditions (vacuum, low and high
temperature, corrosion environment)
*Absence oil (no oiling system)
*Low energy consumption (energy saving,
low heart from environment)
*Rotor position control (creation
microdisplacement of rotor into gap)
*Controllability stiffness and damping
suspention (crossing through critical speed)
*Possibility use of sensor signal (control of
load on active magnetic bearing , rotor outof-balance)

3.

Principle of operation of active magnetic bearing (AMB)
Electromagnet
Reference
signal
+
-
Regulator
+
-
Power
amplifier
+ Position
- sensors
Power
amplifier
Electromagnet
Power amplifier rule by electromagnet
Spring upExternal
position-indicating
action forcesignal,
conduce
which
to rotor
give shift
to regulator
Forces return rotor in central position

4.

Versions of electrical machine whith contactless rotor suspension
AMB 1
Motor
Axial
AMB 2 AMB
Motor with AMB
Bearingless
modul 1
Bearingless
modul 2
Axial
AMB
Bearingless electrical
motor

5.

Principle of operation of bearingless modul
Drive
control
system
у Suspension
control
х
system
Drive
controlcontrol
system
give conduce
acrule
voltage
on
drive
winding,
Suspension
External
action force
system
byto
electromagnet
rotor
shift,
appear
torque,
rotor
rotate
position-indicating
Force return
signal
rotor
giveinto
central
suspension
position
control system

6.

Compressor
for cooling
Space-based
processing
Cryogenic
system
Compressors
for natural gas
Disk drive
Compressors
Spindles
Applications
Inertia accumulator
Turboexpander
Work spindle