Rubber Rotors ( Rubber Lined Rotor Or Rubber Coated Rotors ) Refers To a Rotating Body Supported By a Bearing. An Object Such As a Disc Itself Without a Rotating Shaft, Which Can Be Regarded As a Rubber Rotor When It Adopts a Rigid Connection Or Additional Shaft.
Introduction Of Terminology
According To The Iso Standard, The Rotating Body Supported By The Bearing Is Called The Rubber Rotor.Rubber Rotors Are Mostly The Main Rotating Parts In Power Machinery And Working Machinery.
The Rotating Part Of a Motor Or Some Rotary Machine, Such As a Turbine. The Rubber Rotor Of The Motor Is Generally Composed Of Iron Core, Slip Ring, Wind Blade And So On, Which Are Wound Around The Coil.
Main Components Of High Speed Rotation In Power Machinery Or Working Machinery Such As Motors, Generators, Gas Turbines And Turbine Compressors.
The Main Rubber Rotor Rotates At High Speed, And When Its Speed Is Close To The Critical Speed, The Shaft Produces Deflection Deformation. Even Mechanical Damage Due To Resonance.The Natural Frequency Of Transverse Vibration Of Rubber Rotor Is Multi-Order, So Its Corresponding Critical Speed Is Also Multi-Order.
When The Working Speed Of The Rubber Rotor Is Lower Than The First Order Critical Speed, It Is Called The Rigid Rubber Rotor, And When The Working Speed Of The Rubber Rotor Is Higher Than The First Order Critical Speed, It Is Called The Flexible Rubber Rotor.
The Operating Speed Of Any Type Of Rubber Rotor Shall Not Be Close To The Critical Speed.The Size Of The Critical Speed Of The Rubber Rotor Depends On Its Manufacturing Material, Structural Form, Geometric Size, Supporting Characteristics And Other Factors.
Working Principle
For Example, a Rubber Rotor In An Induction Motor Consisting Of a Rotating Shaft Core And a Closed Conductor Embedded In The Core Produces a High Speed Rotary Motion Driven By a Rotating Magnetic Field Generated By The Stator Winding.The Two Ends Of The Rubber Rotor Adopt Rolling Bearings And Are Fixed In The End Cover Of The Motor Housing.
Because No Matter Which Type Of Rubber Rotor, When It Is Running Will Produce Centrifugal Inertia Force, And Affect The Strength Of Rubber Rotor And Mechanical Efficiency. Therefore, The Rubber Rotor Is Properly Balanced And The Mass Of Each Part Is Redistributed In Order To Reduce The Centrifugal Inertia Force Produced During Rotation.
When The Unbalanced Mass Of The Rubber Rotor Is Approximately Distributed In The Same Plane Perpendicular To The Axis Of Rotation, Such As The Balance Of a Single Disc Cam, The Static Balance Can Be Achieved By Increasing Or Removing The Size And Position Of The Weight Of The Balance Block, Even If The Center Of Gravity Of The Mass Of Each Part Of The Rubber Rotor Coincides With The Axis Of Rotation.
And When The Unbalanced Weight Of The Rubber Rotor Is Located In The Parallel Plane Of The Vertical Rotating Shaft, Only After The Rubber Rotor Rotates, The Unbalanced Weight Will Appear. The Elimination Of This Dynamic Imbalance Is Mostly Achieved By Changing The Weight And Position Of The Balance Block And Eliminating The Inertial Force And The Inertial Force Couple. Avoid Vibration Of Rubber Rotor On Elastic Support.
Rubber Rotor Classification
Typical Rubber Rotors Include Turbine Mechanical Rubber Rotors, Motor Rubber Rotors, Rubber Rotors Of Various Pumps And Rubber Rotors Of Turbine Compressors, Etc.When The Rubber Rotor Rotates At Some Specific Speed, It Will Deform Greatly And Cause Resonance, And The Speed When Causing Resonance Is Called The Critical Speed Of The Rubber Rotor.
In Engineering, The Rubber Rotor With Working Speed Lower Than The First Order Critical Speed Is Called Rigid Rubber Rotor, And The Rubber Rotor Larger Than The First Order Critical Speed Is Called Flexible Rubber Rotor.
Since The Rubber Rotor Is Rotating At High Speed, It Needs To Be Balanced. Static Balance Is Mainly Used To Balance The Inertial Force Of Disc Rubber Rotor. The Dynamic Balance Of The Rigid Rubber Rotor Can Balance The Inertial Force And The Inertial Couple Through The Universal Balancing Machine, And Eliminate The Vibration Of The Rubber Rotor On The Elastic Support.
The Dynamic Balance Of Flexible Rubber Rotor Is More Complex, Which Is Distinguished From The Principle, There Are Two Types Of Vibration Balance Method And Influence Coefficient Method.
Common Malfunctions
Rubber Rotor Due To Difficult Reversing, High Speed, a Variety Of Failures. Common Faults Include Commutator Damage, Bearing Damage, Wind Blade Damage, Brush Wear, Rubber Rotor Winding Burn Down, Etc.
Damage To Commutator
The Common Faults Of Commutator Are Surface Firing Hole, Commutator Flying Out, Short Circuit Between Commutator And Commutator, Lost Circle Of Commutator, Excessive Wear Of Commutator, Protruding Of Mica Sheet, Virtual Connection Between Commutator And Coil Lead, Etc.
The Commutator Surface Burns Holes, The Commutator Piece Flies Out, The Short Circuit Between The Commutator Piece And The Commutator Piece, And The Fault Of Excessive Wear Of The Commutator, The Commutator Should Be Replaced, And The Rubber Rotor Winding Also Needs To Be Replaced.
For The Failure Of The Commutator To Lose Circle, After Processing With a Horizontal Lathe, It Can Continue To Be Used.
If The Commutator And The Coil Cause Virtual Connection, The Failure Point Of The Virtual Connection Can Be Flushed, Riveted Or Welded According To The Situation. If The Fault Point Can Not Be Found, Only The Commutator Can Be Replaced, And The Rubber Rotor Winding Also Needs To Be Replaced.
The Commutator Mica Sheet Protrudes, Can Grind The Side Of The Hacksaw Strip With Teeth Thin, The Mica Moment Low, And The Chamfer And Grinding Treatment.
Bearing Damage
The Commonly Used Bearing Models For Electric Tools Are 608,629,101,102,200,201 And So On.
The Common Faults Of Bearing Are Excessive Clearance, Broken Bearing, Running Coat, Running Inner Sleeve, Holding And So On.
For Bearing Clearance Is Too Large, Bearing Broken, Holding And Other Failures, Need To Replace New Bearings. For Some Running Coats, The Gap Is Too Large, Can Pad Thin Iron (Such As Some Iron Drink Bottles) Or Replace The Housing. And For Some Gap Is Not Particularly Large, Can Be Coated Ab Universal Glue To Solve. For Some Running Inner Sleeve, The Method Of Punching Point Can Be Used To Solve The Problem.
Damage To Wind Blades
When The Wind Blade Is Broken, Deformed And Loosened, The Old Parts Can Be Removed Or Replaced With New Products. For The Iron Wind Blade Deformation, Can Also Be Corrected With The Tip Pliers. For The Wind Blade And Shaft Between Loose, Can Also Be Coated Ab Universal Glue To Stick.
Brush Wear
In General, When The Length Of The Brush Is Worn To 1/3 Of The Original Length, It Should Be Replaced. The Brush Is Too Short, It Is Easy To Burn The Commutator And Cause The Rubber Rotor To Be Scrapped. The Size Of The Brush, Generally Expressed In Length × Width × Height, Replacement In Addition To The Same Size, But Also With The Same Brand Number To Replace. Generally ,2 Brushes Should Be Replaced At The Same Time.
