Six-Phase Motor Phase-Angle Control for Speed-Dependent Torque Split
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Solution Overview
Problem
Existing six-phase motor control methods fail to effectively manage the power performance of vehicles by not adequately accounting for the differences in the number of turns of the 3-phase coils, leading to inefficiencies in power output and torque control.
Innovation Solution
A motor control method that dynamically controls the phase angles of the first and second partial motors, composed of 3-phase coils with different turn counts, to be equal at lower rotation speeds and different at higher speeds, thereby optimizing torque and power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the phase angles of the first and second partial motors are controlled to be equal at all rotation speeds, then the torque control is simplified, but the power performance and efficiency are degraded
Solution Approach 1:
The control system dynamically adjusts the phase angle relationship between the first and second partial motors based on the rotation speed. At low rotation speeds, the phase angles are controlled to be equal for simplified torque control. At high rotation speeds, the phase angles are differentiated to optimize power performance and efficiency, thereby adapting the control strategy to operating conditions.
2Ease of manufacture
If the number of turns of both 3-phase coils is made equal, then the manufacturing process is simplified, but the power output and torque control efficiency are reduced
Solution Approach 1:
The patent applies different numbers of turns to different 3-phase coils (first and second partial motors) according to their specific functional requirements. The first partial motor has a different number of coil turns compared to the second partial motor, allowing each to be optimized for its operating range. This local differentiation of coil characteristics enables improved power output and torque control efficiency while maintaining manufacturing feasibility.
3Device complexity
If a single control strategy is used for both partial motors across all operating conditions, then the control system complexity is reduced, but the noise vibration harshness (NVH) characteristics are degraded
Solution Approach 1:
The control system implements dynamic switching between different control strategies based on rotation speed and output requirements. In the first driving region (lower speeds), the first partial motor is controlled with equal phase angles. In the second driving region (higher speeds), the second partial motor is controlled with differentiated phase angles. This dynamic adaptation reduces NVH characteristics by selecting the optimal control mode for each operating condition while managing system complexity through region-based control.
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 enhances the power performance of vehicles by ensuring equal output torques at lower outputs and differentiated torques at higher outputs, thereby improving efficiency and reducing noise vibration harshness (NVH) characteristics.
Implementation Method 1
a first type 3-phase coil and a second type 3-phase coil wound with a fewer number of turns than the first type 3-phase coil
Data Source
AI summary
Proposed is a motor control method to control the phase angles of a first partial motor and a second partial motor. In particular, the first partial motor includes a first type 3-phase coil and the second partial motor includes a second type 3-phase coil. In a rotation speed region less than or equal to a predetermined reference rotation speed, the phase angles of the first and second partial motors are controlled to be equal. Meanwhile, the phase angles of the first partial motor and the second partial motor are controlled to be different from each other in a rotation speed region exceeding the reference rotation speed.