Automotive electric oil pump
An automotive electric oil pump includes a static pump housing, an electric drive motor, a rotatable pump wheel, and a control module. The static pump housing defines a pumping chamber and a motor chamber which are fluidically connected to each other. The electric drive motor is arranged within the motor chamber. The electric drive motor has a motor stator and a motor rotor. The motor stator has stator coils. The rotatable pump wheel pumps oil through the pumping chamber, wherein a partial volume of the oil within the pumping chamber thereby flows through the motor chamber. The control module energizes the stator coils in a cold-start phase if a temperature of the oil within the motor chamber is below a defined temperature value and inhibits a rotation of the motor rotor. The motor stator directly contacts the oil.
1 . An automotive electric oil pump comprising:
a static pump housing which defines a pumping chamber and a motor chamber, the pumping chamber and the motor chamber being fluidically connected to each other;
an electric drive motor which is arranged within the motor chamber, the electric drive motor comprising a motor stator and a motor rotor, the motor stator comprising a plurality of stator coils;
a rotatable pump wheel which is configured to pump oil through the pumping chamber, wherein a partial volume of the oil within the pumping chamber thereby flows through the motor chamber; and
a control module which is configured to energize the plurality of stator coils in a cold-start phase if a temperature of the oil within the motor chamber is below a defined temperature value and to inhibit a rotation of the motor rotor,
wherein,
the motor stator is in a direct contact with the oil.
2 . The automotive electric oil pump as recited in claim 1 , wherein,
the static pump housing comprises an internal connection channel arranged therein, and
the motor chamber is fluidically connected to the pumping chamber via the internal connection channel.
3 . The automotive electric oil pump as recited in claim 2 , wherein,
the motor chamber comprises a stator section, and
the internal connection channel is arranged to extend between the pumping chamber and the stator section.
4 . The automotive electric oil pump as recited in claim 1 , wherein the motor stator is in a direct contact with the static pump housing.
5 . The automotive electric oil pump as recited in claim 1 , further comprising:
a hollow drive shaft which is configured to fluidically connect the pumping chamber and the motor chamber.
6 . The automotive electric oil pump as recited in claim 1 , further comprising:
a temperature sensor which is configured to measure a temperature of the oil within the static pump housing.
7 . The automotive electric oil pump as recited in claim 1 , further comprising:
a printed circuit board comprising a plurality of power electronic components; and
an electronics chamber which is arranged within the static pump housing,
wherein,
the printed circuit board is arranged within the electronics chamber.
8 . An automotive electric oil pump comprising:
a static pump housing which defines a pumping chamber and a motor chamber, the pumping chamber and the motor chamber being fluidically connected to each other;
an electric drive motor which is arranged within the motor chamber, the electric drive motor comprising a motor stator and a motor rotor, the motor stator comprising a plurality of stator coils;
a rotatable pump wheel which is configured to pump oil through the pumping chamber, wherein a partial volume of the oil within the pumping chamber thereby flows through the motor chamber;
a control module which is configured to energize the plurality of stator coils in a cold-start phase if a temperature of the oil within the motor chamber is below a defined temperature value and to inhibit a rotation of the motor rotor;
a heat transfer wall which fluidically separates an electronics chamber from the motor chamber; and
a temperature sensor which is configured to measure a temperature of the oil within the static pump housing, the temperature sensor being arranged embedded within the heat transfer wall,
wherein,
the motor stator is in a direct contact with the oil.
9 . An automotive electric oil pump comprising:
a static pump housing which defines a pumping chamber and a motor chamber, the pumping chamber and the motor chamber being fluidically connected to each other;
an electric drive motor which is arranged within the motor chamber, the electric drive motor comprising a motor stator and a motor rotor, the motor stator comprising a plurality of stator coils;
a rotatable pump wheel which is configured to pump oil through the pumping chamber, wherein a partial volume of the oil within the pumping chamber thereby flows through the motor chamber;
a control module which is configured to energize the plurality of stator coils in a cold-start phase if a temperature of the oil within the motor chamber is below a defined temperature value and to inhibit a rotation of the motor rotor;
an electronics chamber which is arranged within the static pump housing;
a heat transfer wall which fluidically separates the electronics chamber from the motor chamber; and
a printed circuit board comprising a plurality of power electronic components, the printed circuit board being arranged directly on and in an inner heat transferring contact with the heat transfer wall,
wherein,
the motor stator is in a direct contact with the oil.
10 . The automotive electric oil pump as recited in claim 9 , further comprising:
a temperature sensor which is configured to measure a temperature of the oil within the static pump housing, the temperature sensor being arranged embedded within the heat transfer wall.
11 . The automotive electric oil pump as recited in claim 10 , wherein the temperature sensor is further arranged to be in a direct contact with the printed circuit board.