Axial Electric Fluid Pump Cooling Motor Electronics
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Solution Overview
Problem
Existing electric automotive fluid pumps face challenges in achieving high pumping performance while effectively cooling the motor electronics, often requiring sophisticated cooling technologies and complex constructions.
Innovation Solution
The electric automotive fluid pump design positions the pumping unit axially between the motor electronics and the mechanical part of the motor, utilizing at least two axially oriented permanent magnet poles that cooperate with a stationary hall sensor to improve cooling and simplify construction, with the motor electronics being kept remote from the motor coils and the hall sensor integrated within the motor electronics for enhanced signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the motor electronics is arranged close to the motor coils to reduce device complexity, then the construction is simpler, but the motor electronics is heated up by the motor coils
Solution Approach 1:
The patent resolves the contradiction by changing the spatial arrangement from a radial/planar layout to an axial layout. The pumping unit is positioned axially between the motor electronics and the motor, creating a new dimensional arrangement that allows the motor electronics to be close to the motor for simple construction while the pumping unit acts as a thermal barrier to prevent heating.
2Temperature
If the motor electronics is spaced apart from the motor to avoid heating, then the motor electronics cooling is improved, but the construction becomes more complex
Solution Approach 1:
The pumping unit is given multiple functions: it performs the primary pumping function and simultaneously serves as a thermal barrier/cooling element for the motor electronics. This multi-functionality allows the motor electronics to be spaced apart for better cooling without adding separate cooling components, thus avoiding increased construction complexity.
3Temperature
If sophisticated cooling technology is added to cool the motor electronics, then the cooling performance is improved, but the device complexity increases
Solution Approach 1:
The pumping unit, which is already part of the motor assembly, serves the additional function of cooling the motor electronics by acting as a thermal barrier. This self-service approach allows the system to achieve improved cooling performance without adding separate cooling technologies, thereby avoiding increased device complexity.
4Device complexity
If the hall sensor is positioned far from the motor electronics, then the construction is simpler, but the signal quality deteriorates
Solution Approach 1:
The patent positions the hall sensor axially opposite to the magnet pole on the pump rotor, utilizing the axial dimension for optimal signal detection. This axial positioning in the magnetic field path ensures good signal quality while keeping the sensor integrated with the motor electronics, achieving both signal quality and construction simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances cooling efficiency of the motor electronics, reduces manufacturing costs, and improves the accuracy of motor rotor commutation while maintaining a compact and efficient design, capable of handling high viscosity fluids like oil with low noise and high hydraulic efficiency.
Implementation Method 1
The pump rotor body (78') comprises at least one permanent magnet pole (N, S), which cooperates with at least one stationary hall sensor (70)
Implementation Method 2
The hall sensor (70) is arranged axially opposite to the magnet pole (N, S) and detects the magnetic field generated by the magnet pole
Implementation Method 3
the motor electronics is provided close to the pumping unit so that the fluid in the pumping unit actively cools the motor electronics
Data Source
Figure 1
Figure 2
AI summary
The present invention relates to an electric automotive fluid pump (10) comprising an electronically commutated motor (42) with a motor rotor (46) being permanently magnetized and stator coils (50), and a motor electronics (58) for electronically commutating and driving the stator coils (50) of the motor (42). The electric automotive fluid pump (10) further comprises a pumping unit (82) which is arranged axially between the motor electronics (58) and the motor (42), a rotor shaft (54) mechanically connecting a pump rotor (78) of the pumping unit (82) with the motor rotor (46), wherein the pump rotor (78) comprises a pump rotor body (78') and at least one permanent magnet pole (N, S), which cooperates with at least one stationary hall sensor (70).