Electric motor system
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Solution Overview
Problem
Existing electric motor systems for turbo compressors face inefficiencies due to differences in torque generation capabilities between motors, leading to uneven power distribution and increased power consumption across varying operational speeds.
Innovation Solution
An electric motor system comprising a drive shaft, two bearingless motors, and a control unit that adjusts the torque distribution ratio between the motors based on operational conditions and motor efficiencies, ensuring optimal torque output and reduced power consumption by suspending power conversion operations when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple electric motors with different torque generation capabilities are used to rotate the drive shaft, then the system can operate across a wider speed range, but power consumption increases due to uneven power distribution among motors
Solution Approach 1:
The control unit dynamically adjusts the torque distribution ratio between the first and second electric motors based on the rotational speed of the drive shaft. As speed increases, the ratio of torque from the first motor (higher max torque) to the second motor (lower max torque) is reduced, optimizing power distribution and minimizing overall power consumption across the operational speed range.
Solution Approach 2:
The system changes the operational parameters (torque distribution ratio) of the electric motors based on the rotational speed condition. By adjusting which motor contributes more torque at different speed levels, the system achieves efficient operation across a wide speed range while managing power consumption.
2Device complexity
If the torque distribution ratio between motors is fixed, then the system structure is simpler, but efficiency decreases across varying operational speeds
Solution Approach 1:
The control unit implements dynamic adjustment of the torque distribution ratio based on real-time rotational speed feedback. This dynamic control strategy optimizes power consumption across varying speeds while maintaining a relatively simple overall system structure, as the control logic follows a clear speed-based distribution rule.
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
The system achieves efficient torque output over a wide speed range by optimizing motor usage and power distribution, thereby reducing overall power consumption and improving control responsiveness.
Implementation Method 1
The first electric motor and the second electric motor are configured to rotate the drive shaft
Data Source
AI summary
An electric motor system includes a drive shaft, a first electric motor, a second electric motor, a first inverter, a second inverter and a control unit. The drive shaft is rotatable around an axis. The first electric motor and the second electric motor rotate the drive shaft. The first inverter supplies power in order to generate a torque to the first electric motor. The second inverter supplies power in order to generate a torque to the second electric motor. The control unit controls the first inverter and the second inverter. The controller is configured to be able to change a ratio between an output torque of the first electric motor and an output torque of the second electric motor.