Electric Machine Rotor Position Sensor Integration
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Solution Overview
Problem
Existing electric machines for motor vehicles and motorcycles have a significant space requirement due to the axial arrangement of rotor position encoders or resolvers, which are used to measure the rotor's position for control purposes.
Innovation Solution
The electric machine design incorporates a rotor position sensor received in the rotor's interior space, allowing it to rotate with the rotor and transmit the position signal externally, thereby eliminating the need for an axial arrangement, and utilizing a carrier element like a cooling lance to support the sensor, reducing the overall space requirement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotor position encoder or resolver is arranged axially at the end of the rotor, then the rotor position can be measured for control purposes, but the space requirement for the electric machine is significantly increased
Solution Approach 1:
The rotor position sensor is nested within the rotor's interior space, specifically in a receiving area formed inside the rotor structure. This allows the sensor to be housed within the rotor itself rather than requiring additional external space, effectively implementing a nested configuration that resolves the space contradiction while maintaining measurement capability
Solution Approach 2:
The invention transitions from a one-dimensional axial arrangement (at the end of the rotor) to a two-dimensional integration within the rotor's cross-sectional interior space. By utilizing the receiving area formed within the rotor structure, the sensor is positioned in a different spatial dimension, eliminating the need for extended axial length and reducing overall machine volume
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 optimizes the design space by integrating the rotor position sensor within the rotor, allowing for efficient control of the electric machine without the need for additional space-consuming external sensors, while maintaining effective rotor position detection.
Implementation Method 1
the rotor has a receiving area in which a rotor position sensor is received, which supplies an output signal used for controlling the electric machine during normal operation of the electric machine, said output signal indicating a rotational position of the rotor
Implementation Method 2
the rotor carries at least one exciter coil in which a flow of current is generated during normal operation to build up a magnetic field. The magnetic field built up by the exciter coil interacts with a rotary magnetic field which is generated by coils arranged on the stator so that the rotor rotates about the axis of rotation during normal operation
Data Source
AI summary
An electric machine for a vehicle includes a stator and a rotor, where the rotor is inserted into an interior space of the stator such that the rotor rotates about an axis of rotation during normal operation of the electric machine. The rotor has a receiving area in which a rotor position sensor is received, and the rotor position sensor is configured to supply an output signal to control the electric machine during normal operation of the electric machine, said output signal indicating a rotational position of the rotor.