Motor for washing machine

Abstract

A motor for a drum-type washing machine is disclosed, wherein noise is reduced. To this end, the drum-type washing machine is provided with a washing motor comprising a stator fitted at a rear surface of a tub and having a plurality of protrusions on which a coil is wound; a rotor provided at an outer side of the stator with a permanent magnet and connected to a washing drum inside the tub by a driving shaft; and isolating means for partitioning a clearance space from the stator and the rotor not to be communicated with the stator and the rotor.

1 . A motor for use in a washing machine, the motor comprising: 
 a stator fixed to a rear surface of a tub, and having a plurality of slots wound with a coil;    a rotor provided at an outside of the stator together with a permanent magnet, and directly coupled to a washing drum installed inside the tub by a driving shaft; and    isolating means for isolating a clearance between the stator and the rotor such that the stator and the rotor do not communicate with each other.    
   
   
       2 . The motor as claimed in  claim 1 , wherein the isolating means comprises a shield plate for shielding a space formed between the slots.  
   
   
       3 . The motor as claimed in  claim 2 , wherein the shield plate is a unitary piece enclosing all surfaces of the slots facing the permanent magnet to fully close the space between the slots.  
   
   
       4 . The motor as claimed in  claim 2 , wherein the shield plate is a plurality of unit pieces each attached to the surface of the adjacent slot facing the permanent magnet to separately close the space between the slots.  
   
   
       5 . The motor as claimed in  claim 2 , wherein the shield plate is made of non-magnetic material.  
   
   
       6 . The motor as claimed in  claim 5 , wherein the shield plate is made of a non-adhesive film.  
   
   
       7 . The motor as claimed in  claim 5 , wherein the shield plate is made of an adhesive tape.  
   
   
       8 . The motor as claimed in  claim 6  or  7 , wherein the film or tape is made of heat-shrink resin material.  
   
   
       9 . The motor as claimed in  claim 2 , wherein the isolating member further comprises an auxiliary shield plate for closing the space between the permanent magnets.  
   
   
       10 . The motor as claimed in  claim 9 , wherein the auxiliary shield plate is a unitary piece fully enclosing a surface of the permanent magnet facing the slot to entirely close the space between the permanent magnet.  
   
   
       11 . The motor as claimed in  claim 9 , wherein the auxiliary shield plate is a plurality of unit pieces each attached to a surface of the adjacent permanent magnet facing the slot to separately close the space between the permanent magnets.  
   
   
       12 . The motor as claimed in  claim 9 , wherein the auxiliary shield plate is made of non-magnetic material.  
   
   
       13 . The motor as claimed in  claim 12 , wherein the auxiliary shield plate is made of a non-adhesive film.  
   
   
       14 . The motor as claimed in  claim 12 , wherein the auxiliary shield plate is made of an adhesive tape.  
   
   
       15 . The motor as claimed in  claim 13  or  14 , wherein the film or tape is made of heat-shrink resin material.  
   
   
       16 . The motor as claimed in  claim 1 , wherein the isolating means comprises a plug member for filling a space between the slots.  
   
   
       17 . The motor as claimed in  claim 16 , wherein the plug member is a unitary piece filling the space between the slot at once.  
   
   
       18 . The motor as claimed in  claim 17 , wherein the plug member comprises: 
 a hub seated on an upper surface of a frame of the stator;    a coupling rib formed at the hub corresponding to the coupling rib for fixing the stator to the tub; and    a plurality of tips formed at the hub at a regular interval, each of which is inserted into the space between the slots.    
   
   
       19 . The motor as claimed in  claim 18 , wherein the plug member further comprises a plurality of reinforcing ribs formed at the hub for reinforcing strength thereof.  
   
   
       20 . The motor as claimed in  claim 16 , wherein the plug member is a plurality of unit pieces, each separately filling the space between the slots.  
   
   
       21 . The motor as claimed in  claim 16 , wherein the plug member is a plurality of tips each inserted into the space between the slots.  
   
   
       22 . The motor as claimed in  claim 18  or  21 , wherein the tip is adapted to fill the entire spaces formed between the slots.  
   
   
       23 . The motor as claimed in  claim 22 , wherein a longitudinal section of the tip has an approximately rectangular shape.  
   
   
       24 . The motor as claimed in  claim 18  or  21 , wherein the tip is adapted to partially fill the space formed between the slots.  
   
   
       25 . The motor as claimed in  claim 24 , wherein the tip has an end closing the space between the slots.  
   
   
       26 . The motor as claimed in  claim 24 , wherein a longitudinal section of the tip has an approximately triangular shape.  
   
   
       27 . The motor as claimed in  claim 18  or  21 , wherein the tip has a hollow portion or recessed groove extended from an upper surface or a lower surface thereof.  
   
   
       28 . The motor as claimed in  claim 18  or  21 , wherein the tip is forcibly fitted between the slots.  
   
   
       29 . The motor as claimed in  claim 16 , wherein the plug member is made of non-magnetic material.  
   
   
       30 . The motor as claimed in  claim 6 , wherein the isolating member further comprises an auxiliary plug member filling the space between the permanent magnets.  
   
   
       31 . The motor as claimed in  claim 30 , wherein the auxiliary plug member is a unitary piece filling the space between the permanent magnet at one, or is a plurality of unit pieces closing separately the space between the permanent magnet.  
   
   
       32 . The motor as claimed in  claim 31 , wherein the auxiliary plug member comprises a plurality of tips each inserted into the space between the permanent magnets.  
   
   
       33 . The motor as claimed in  claim 32 , wherein the tip is adapted to fill the entire spaces formed between the permanent magnets.  
   
   
       34 . The motor as claimed in  claim 33 , wherein a longitudinal section of the tip has an approximately rectangular shape.  
   
   
       35 . The motor as claimed in  claim 32 , wherein the tip is adapted to partially fill the space formed between the permanent magnets.  
   
   
       36 . The motor as claimed in  claim 35 , wherein the tip has an end closing the space between the permanent magnets.  
   
   
       37 . The motor as claimed in  claim 35 , wherein a longitudinal section of the tip has an approximately triangular shape.  
   
   
       38 . The motor as claimed in  claim 32 , wherein the tip has a hollow portion or recessed groove extended from an upper surface or a lower surface thereof.  
   
   
       39 . The motor as claimed in  claim 32 , wherein the tip is forcibly fitted between the permanent magnets.  
   
   
       40 . The motor as claimed in  claim 30 , wherein the plug member is made of non-magnetic material.