Pump apparatus

Abstract

A pump apparatus is provided with a tank in which a handled-fluid having insulating properties is stored, and with a pump that is mounted in the tank. The pump has an impeller in which a magnet is embedded, a motor stator that is disposed at a position opposing the magnet, a pump casing that houses the impeller, and a motor casing that houses the motor stator. The motor casing is open such that a winding of the motor stator is immersed in the handled-fluid.

What is claimed is: 
     
         1 . A pump apparatus comprising:
 a tank in which a handled-fluid having insulating properties is stored; and   a pump that is mounted in the tank, wherein
 the pump has
 an impeller in which a magnet is embedded, 
 a motor stator that is disposed at a position opposing the magnet, 
 a pump casing that houses the impeller, and 
 a motor casing that houses the motor stator, and 
 
 the motor casing is open such that a winding of the motor stator is immersed in the handled-fluid. 
   
     
     
         2 . The pump apparatus according to  claim 1 , wherein
 a guide is disposed on an intake side of the pump, the guide guiding the handled-fluid such that the handled-fluid passes through a position where the motor casing is open.   
     
     
         3 . The pump apparatus according to  claim 1 , wherein
 an intake port of the pump is disposed at a higher height position than the motor stator.   
     
     
         4 . The pump apparatus according to  claim 3 , further comprising:
 a controller that monitors current supplied to the motor stator, and in cases in which the current supplied to the motor stator falls below a prescribed threshold, the controller performs at least one operation out of stopping the supply of current to the motor stator or issuing an alert.