Electrically driven motors and pumps having such motors

Abstract

A motor, possibly for a pump, has a housing, a first member disposed within the housing and mounted on an inner wall of the housing, and a second member rotatably disposed within the housing and having a rotary shaft. A thrust bearing is mounted within the housing in order to support a first end of the rotary shaft in an axial direction of the rotary shaft. A core and coils wound around the core are provided on one of the first and second members. A set of magnets is provided on the other of the first and second members. The core and the set of magnets are positioned such that a magnetic force is produced in an area where a magnetic flux is generated between the core and the set of magnets. The magnetic force causes the second member to move toward the thrust bearing.

1 . A motor comprising: 
 a housing;    a first member disposed within the housing and mounted on an inner wall of the housing;    a second member rotatably disposed within the housing and having a rotary shaft, wherein at least a part of the second member opposes at least a part of the first member in a radial direction of the rotary shaft;    a thrust bearing mounted within the housing and arranged and constructed to support a first end of the rotary shaft in an axial direction of the rotary shaft; and    a core and coils wound around the core provided on one of the first and second members and a set of magnets provided on the other of the first and second members, so that a rotation force for rotating the second member relative to the first member is produced by exciting the coils;    wherein, the core and the set of magnets are positioned such that a magnetic force is produced in an area where a magnetic flux is generated between the core and the set of magnets, to move the second member toward the thrust bearing.    
   
   
       2 . The motor as in  claim 1 , wherein the core and the set of magnets are offset from each other in the axial direction of the rotary shaft.  
   
   
       3 . The motor as in  claim 2 , wherein the motor is configured as a brush-less motor, and wherein the first member comprises a stator having the core and the coils, and wherein the second member comprises a rotor having the set of magnets.  
   
   
       4 . The motor as in  claim 3 , wherein the set of magnets is offset relative to the core in a direction away from the thrust bearing.  
   
   
       5 . The motor as in  claim 4 , wherein the core and the set of magnets have different lengths in the axial direction of the rotary shaft, and wherein the set of magnets extends beyond the core in a direction away from the thrust bearing.  
   
   
       6 . The motor as in  claim 2 , wherein the motor is configured as a DC motor, and wherein the first member comprises the set of magnets, and wherein the second member comprises an armature having the core and the coils.  
   
   
       7 . The motor as in  claim 6 , wherein the core is offset relative to the set of magnets in a direction away from the thrust bearing.  
   
   
       8 . The motor as in  claim 7 , wherein the core and the set of magnets have different lengths in the axial direction of the rotary shaft, so that the core extends beyond the set of magnets in a direction away from the thrust bearing.  
   
   
       9 . The motor as in  claim 1 , further comprising: 
 a first end cover disposed on one end of the housing in a direction opposite to the thrust bearing; and    a second end cover disposed on the other end of the housing on the side of the thrust bearing,    wherein the first end cover is formed integrally with the housing.    
   
   
       10 . The motor as in  claim 9 , wherein the rotary shaft has second end opposite to the first end, and wherein the second end is rotatably supported by the first end cover.  
   
   
       11 . The motor as in  claim 10 , wherein the thrust bearing is mounted on the second end cover.  
   
   
       12 . The motor as in  claim 9 , further comprising an electric control circuit electrically connected to the coils in order to control the supply of current to the coils, and wherein the electrical control circuit is disposed within a substantially closed space formed within the first end cover.  
   
   
       13 . A pump comprising: 
 a housing;    a motor section disposed within the housing and comprising: 
 a first member disposed within the housing and mounted on an inner wall of the housing; and  
 a second member rotatably disposed within the housing and having a rotary shaft, wherein at least a part of the second member opposes at least a part of the first member in a radial direction of the rotary shaft; and  
 a core and coils wound around the core provided on one of the first and second members and a set of magnets provided on the other of the first and second members, so that a rotation force for rotating the second member relative to the first member is produced when the coils are excited;  
   a thrust bearing mounted within the housing and arranged and constructed to support a first end of the rotary shaft in an axial direction of the rotary shaft; and    a pump section disposed within the housing and arranged and constructed to be driven by the motor section;    wherein, the core and the set of magnets are positioned such that a magnetic force is produced in an area where a magnetic flux is generated between the core and the set of magnets, to move the second member towards the thrust bearing.    
   
   
       14 . The pump as in  claim 13 , wherein the core and the set of magnets are offset from each other in the axial direction of the rotary shaft.  
   
   
       15 . The pump as in  claim 14 , wherein the motor section is configured as a brush-less motor, and wherein the first member comprises a stator having the core and the coils, and wherein the second member comprises a rotor having the set of magnets.  
   
   
       16 . The pump as in  claim 15 , wherein the set of magnets is offset relative to the core in a direction away from the thrust bearing.  
   
   
       17 . The pump as in  claim 16 , wherein the core and the set of magnets have different lengths in the axial direction of the rotary shaft, so that the set of magnets extends beyond the core in an axial direction away from the thrust bearing.  
   
   
       18 . The pump as in  claim 14 , wherein the motor section is configured as a DC motor, and wherein the first member comprises the set of magnets; and wherein the second member comprises an armature having the core and the coils.  
   
   
       19 . The pump as in  claim 18 , wherein the core is offset relative to the set of magnets in a direction away from the thrust bearing.  
   
   
       20 . The pump as in  claim 19 , wherein the core and the set of magnets have different lengths in the axial direction of the rotary shaft, so that the core extends beyond the set of magnets in a direction away from the thrust bearing.  
   
   
       21 . The pump as in  claim 13 , further comprising: 
 a first end cover disposed on one end of the housing in an axial direction opposite to the thrust bearing; and    a second end cover disposed on the other end of the housing on the side of the thrust bearing,    wherein the first end cover is formed integrally with the housing.    
   
   
       22 . The pump as in  claim 21 , wherein the rotary shaft has a second end opposite to the first end, and 
 wherein the second end is rotatably supported by the first end cover.    
   
   
       23 . The pump as in  claim 22 , wherein the thrust bearing is mounted on the second end cover.  
   
   
       24 . The pump as in  claim 21 , further comprising an electric control circuit electrically connected to the coils in order to control the supply of current to the coils, wherein the electrical control circuit is disposed within a substantially closed space formed within the first end cover.  
   
   
       25 . The pump as in  claim 13 , wherein the pump is used for pumping a liquid.