Multi-Phase Motor Thermal Control with Winding Subgroups
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Solution Overview
Problem
The uneven heat dissipation in electric machines, such as permanent magnet synchronous electric machines, due to restricted airflow in vehicle frames affects the operating efficiency and output power, especially in electric motorcycles where heat generated by stator windings cannot be dissipated uniformly.
Innovation Solution
The implementation of an N-phase electric machine with stator windings divided into subgroups and temperature measurement devices, allowing current control modules to independently adjust the power supply amplitude based on temperature measurements to manage heat dissipation effectively, either by reducing or increasing the power supply to maintain optimal operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air flows uniformly through the housing, then heat dissipation is improved, but the vehicle frame structure restricts uniform airflow
Solution Approach 1:
The patent divides the stator windings into multiple independent subgroups (first subgroup, second subgroup, etc.), each with its own temperature measurement device and current control module. This segmentation allows independent temperature monitoring and control for different winding regions, enabling targeted heat management in areas with restricted airflow.
Solution Approach 2:
The patent implements local temperature measurement and control by placing temperature measurement devices at different locations corresponding to different stator winding subgroups. Each current control module independently adjusts the power supply amplitude based on local temperature conditions, allowing differential heat dissipation management for different regions of the stator windings affected by restricted airflow.
2Power
If heat is generated by stator windings during operation, then power output is improved, but excessive heat affects operating efficiency and output power
Solution Approach 1:
The patent implements a feedback control mechanism where temperature measurement devices continuously monitor the temperature of each stator winding subgroup, and current control modules adjust the power supply amplitude based on these temperature measurements. This closed-loop feedback system prevents excessive heat accumulation by reducing power supply when temperatures rise, while maintaining high output power when temperatures are within acceptable ranges.
Solution Approach 2:
The patent makes the power supply system dynamic by enabling current control modules to continuously adjust the power supply amplitude to stator windings based on real-time temperature measurements. This dynamic control allows the system to adapt to changing thermal conditions during operation, optimizing the balance between power output and heat management.
3Power
If stator windings are arranged at fixed phase angles, then rotating magnetic field generation is improved, but heat dissipation uniformity deteriorates
Solution Approach 1:
The patent segments the stator windings into multiple subgroups while maintaining their fixed phase angle arrangements for rotating magnetic field generation. Each subgroup is independently monitored and controlled, allowing the system to preserve the necessary electrical configuration for power generation while addressing thermal management needs through localized control.
Solution Approach 2:
The patent applies local temperature measurement and control to different stator winding subgroups, allowing each region to be managed according to its specific thermal characteristics while maintaining the overall fixed phase angle arrangement necessary for rotating magnetic field generation.
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 approach effectively addresses the issue of uneven heat dissipation in both the circumferential and axial directions without compromising the electric machine's efficiency and output power, ensuring consistent performance.
Implementation Method 1
each temperature measurement device being used for measuring the temperature of one corresponding subgroup in the i subgroups during operation of the electric machine
Implementation Method 2
The stator windings are essentially formed of metal wires (e.g. copper wires or aluminium wires). Thus, when currents flow through the stator windings, heat will be generated
Implementation Method 3
based on a temperature measurement value of the corresponding subgroup, each current control module independently controls a power supply amplitude of the stator windings in said subgroup during operation of the electric machine
Implementation Method 4
when the stator windings in the i subgroups are supplied with power by means of the i current control modules, a rotating magnetic field is generated around the rotor
Data Source
AI summary
An N-phase electric machine, N being an integer ≥3, includes a housing; i×N stator windings arranged in a fixed manner in the housing, i being an integer ≥2; and a rotatable rotor surrounded by the i×N stator windings in the housing. The stator windings are consecutively divided into i subgroups in a circumferential direction, each subgroup having N stator windings. The electric machine further comprises i current control modules and i temperature measurement devices, each current control module being correspondingly electrically connected to the N stator windings in one corresponding subgroup, so that when the stator windings in the i subgroups are supplied with power by the i current control modules, a rotating magnetic field is generated around the rotor. Each temperature measurement device is configured to measure the temperature of one corresponding subgroup in the i subgroups during operation of the electric machine.