Electric oil pump and motor module

The electric oil pump addresses the challenge of inaccurate electric motor control by immersing windings and temperature sensors in oil within its connected internal spaces, enabling precise temperature detection and resistance calculation for enhanced motor control and efficiency.

JP2025040522APending Publication Date: 2025-03-25NIDEC MOBILITY CORP
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Patent Information

Application Number
JP2023147377
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-12
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

Existing electric oil pumps for vehicles lack accurate control of electric motors due to imprecise detection of winding temperatures, which can lead to inefficient operation and potential damage from overheating.

Method used

The electric oil pump incorporates a pump section, an electric motor, and a control section where the internal spaces are connected and filled with oil, allowing the windings of the electric motor and temperature sensors to be immersed in oil. This configuration enables accurate temperature detection and resistance calculation for precise motor control.

Benefits of technology

By immersing temperature sensors and windings in oil, the electric oil pump achieves more accurate winding temperature detection, allowing for high-accuracy control of the electric motor, improved efficiency, and reduced risk of overheating.

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Abstract

To control an electric motor with high accuracy by more accurately detecting winding temperature of the electric motor.SOLUTION: An electric oil pump 100 includes an electric motor 1, a control unit 2, and a pump unit 3. Internal spaces S1, S2, and S3 of these portions are connected to each other, and oil Q is filled in the internal spaces S1, S2, and S3. Winding 14 of the electric motor 1 is immersed in oil Q. A first temperature sensor 22 for detecting temperature of the oil Q and a motor control circuit 24 for controlling the electric motor 1 are mounted on a circuit board 21 of the control unit 2. The first temperature sensor 22 is immersed in the oil Q together with the circuit board 21. The motor control circuit 24 controls the electric motor 1 based on temperature detected by the first temperature sensor 22.SELECTED DRAWING: Figure 2
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