Electrical motor vehicle coolant pump

Abstract

An electric coolant pump for a motor vehicle includes a wet section in which is arranged an impeller and a permanently magnetized motor rotor of an electronically commutated electromotor, a dry section in which is arranged an electric circuit board comprising a plurality of power semiconductors which each comprise a cooling lug, and a partition wall lying in a traverse plane. The partition wall is arranged to separate the wet section and the dry section. The plurality of power semiconductors are each arranged on a proximal side of the electric circuit board facing the partition wall. Each cooling lug is arranged on a cooling lug conductor strip. On a side of the partition wall facing the electric circuit board, the partition wall comprises a heat conductor which is configured to be electrically non-conductive. The heat conductor is arranged to rest directly on a respective cooling lug conductor strip.

What is claimed is: 
     
         1 - 5 . (canceled) 
     
     
         6 . An electric coolant pump for a motor vehicle, the electric coolant pump comprising:
 a wet section in which is arranged an impeller and a permanently magnetized motor rotor of an electronically commutated electromotor;   a dry section in which is arranged an electric circuit board comprising a plurality of power semiconductors which each comprise a cooling lug; and   a partition wall lying in a traverse plane, the partition wall being arranged to separate the wet section and the dry section,   wherein,   the plurality of power semiconductors are each arranged on a proximal side of the electric circuit board facing the partition wall,   each cooling lug is arranged on a cooling lug conductor strip, and   on a side of the partition wall facing the electric circuit board, the partition wall comprises a heat conductor which is configured to be electrically non-conductive, the heat conductor being arranged to rest directly on a respective cooling lug conductor strip.   
     
     
         7 . The electric coolant pump as recited in  claim 6 , wherein, on the side of the partition wall facing the circuit board, the partition wall further comprises a recess for each of the plurality of power semiconductors, into which recess a respective power semiconductor is arranged to extend axially. 
     
     
         8 . The electric coolant pump as recited in  claim 6 , wherein the cooling lug conductor strip comprises a cooling lug conductor strip surface area and the cooling lug comprises a cooling lug surface area, wherein the cooling lug conductor strip surface area is at least twice the size of the cooling lug surface area. 
     
     
         9 . The electric coolant pump as recited in  claim 8 , wherein the cooling lug conductor strip surface area is at least three times the size of the cooling lug surface area. 
     
     
         10 . The electric coolant pump as recited in  claim 8 , wherein the cooling lug conductor strip surface area is at least five times the size of the cooling lug surface area. 
     
     
         11 . The electric coolant pump as recited in  claim 6 , wherein the electronically commutated electromotor comprises a separating can which is configured to separate the wet section from the dry section. 
     
     
         12 . The electric coolant pump as recited in  claim 6 , wherein the electric circuit board further comprises electric controls configured to drive the plurality of power semiconductors, the electric controls being arranged on a side of the circuit board averted from the partition wall.