Synchronous Motor Assembly for Tensing Mechanism
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Solution Overview
Problem
Existing electric drive systems with multiple motors face challenges in efficient controllability and component redundancy, particularly in applications requiring precise bracing mechanisms for gear or train systems, where maintaining backlash-free operation and minimizing component count are essential.
Innovation Solution
The method employs two synchronous motors with angularly offset magnetic flux linkages, allowing the same phase current to function as either a flux-forming or torque-forming current component, and connects them in series with a common power converter, reducing the need for separate converters and position sensors, while ensuring coordinated movement through angular displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two electric motors are used with separate power converters and position sensors for redundancy, then reliability is improved, but device complexity and component count increase
Solution Approach 1:
The patent combines two power converters into a single common power converter that supplies both synchronous motors. This merging eliminates redundant converter components while maintaining the dual-motor architecture needed for reliability, directly reducing device complexity without sacrificing operational reliability
Solution Approach 2:
The common power converter is designed to universally supply power to both motors through series connection, performing multiple functions with a single component. This multi-functional approach reduces the overall component count while maintaining system reliability through coordinated motor operation
2Ease of operation
If two electric motors are controlled independently with separate converters, then controllability is improved, but loss of substance increases due to redundant components
Solution Approach 1:
By merging the power conversion functions into a single common converter, the patent eliminates redundant electronic components while maintaining independent motor control through series connection topology and coordinated control strategies
Solution Approach 2:
The patent uses identical synchronous motors connected in series, where one motor's current components serve as copies of the other's but with different functional assignments (flux-forming vs torque-forming), reducing component variety and manufacturing complexity
3Ease of manufacture
If motors are operated without angular offset, then construction is simplified, but manufacturing precision decreases due to play in gear systems
Solution Approach 1:
The patent introduces an angular offset parameter between the magnetic flux linkages of the two motors, transforming the operational parameters to enable coordinated movement that eliminates gear play while maintaining construction simplicity through the series connection architecture
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 controllability, reduces component count, and increases technical reliability by allowing coordinated movement between motors, effectively eliminating play in gear systems and optimizing torque utilization, thus improving operational safety and efficiency.
Implementation Method 1
the pole wheels or rotors of the two synchronous motors are angularly offset from one another with their magnetic flux linkages or other magnet alignments
Implementation Method 2
the synchronous motors are connected in series and are fed by a common converter, for example an inverter
Data Source
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AI summary
The method involves utilizing two synchronous motors as electric motors, and supplying a same phase current to synchronous motors from a common power converter. Reference and control values are predetermined for a pretension moment. A motor moment-control value is output by a speed controller. A cross current component is derived for a current reference value. A longitudinal current component is derived for the current reference value with reversal of sign from the predetermined motor moment-control value. Independent claims are also included for the following: (1) an electric motor arrangement comprising synchronous motors (2) a closed-loop and speed controller for controlling an electric drive, comprising a motor moment-control value calculating device.