Synchronizing Asynchronous Motors via Master Flux Angle Control
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Solution Overview
Problem
Mechanically coupled asynchronous motors introduce torque ripples into mechanical systems, leading to undesirable quality differences and reduced service life due to uncorrelated flux angles, which cause disruptive torsional forces and oscillations.
Innovation Solution
A method and system where one asynchronous motor is designated as the master, with its flux angle detected and used as a setpoint to regulate the flux angle of the other motors, synchronizing their operation and reducing torque ripples through flux angle regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple asynchronous motors are mechanically coupled to drive a common load, then the power and driving capability are improved, but torque ripples and torsional forces increase due to uncorrelated flux angles
Solution Approach 1:
The patent implements a feedback mechanism where the flux angle of one motor (master) is continuously monitored and used as a reference to regulate the flux angles of other motors (slaves). This closed-loop control ensures that all motors operate with synchronized flux angles, eliminating the uncorrelated flux angle problem and reducing torque ripples while maintaining the power benefits of multiple coupled motors.
Solution Approach 2:
The patent changes the operational parameters of the motors by synchronizing their flux angles through active regulation. By adjusting and maintaining identical flux angle parameters across all mechanically coupled motors, the system transforms the harmful uncorrelated operation into coordinated operation, thereby reducing torque ripples and torsional forces while preserving the enhanced driving capability.
2Adaptability or versatility
If each asynchronous motor operates independently with its own flux angle, then the system adaptability and ease of control are improved, but manufacturing precision and quality consistency deteriorate due to torsional forces
Solution Approach 1:
The feedback mechanism continuously monitors the master motor's flux angle and regulates the slave motors to match it. This real-time synchronization ensures that all motors produce consistent torque output without harmful torsional forces, thereby improving manufacturing precision and quality consistency while maintaining system adaptability through the flexible master-slave configuration.
Solution Approach 2:
The patent creates an equipotential condition for flux angles across all motors by regulating them to identical values. This equalization of the flux angle parameter ensures that all motors operate under the same effective conditions, eliminating the quality variations caused by uncorrelated flux angles while preserving the adaptability of the overall system.
3Ease of operation
If asynchronous motors operate with uncorrelated flux angles, then the system complexity is reduced and ease of operation is improved, but the service life of mechanical components deteriorates due to oscillating torsional forces
Solution Approach 1:
The feedback-based flux angle regulation system maintains simple operation by automatically synchronizing all motors without requiring manual intervention. The master motor operates independently while slave motors automatically adjust to match its flux angle, preserving ease of operation while eliminating the service life-reducing torsional forces through continuous flux angle synchronization.
Solution Approach 2:
The slave motors perform self-adjustment by automatically regulating their flux angles to match the master motor's flux angle. This self-service mechanism eliminates the need for complex external control while reducing torsional forces, thereby extending the service life of mechanical components without compromising operational simplicity.
Data Source
AI summary
A method for operating a system having at least two mechanically coupled asynchronous motors, a computer program implementing the method and a system operating in accordance with the method are disclosed. One asynchronous motor is selected as master, with the other asynchronous motor(s) selected as slave(s). An effective (master) flux angle is measured in the motor selected as master and used as a basis for a setpoint value for controlling the flux angle of every other motor (slave) in the system. The flux angle of every slave motor is adjusted to the setpoint value as part of the control operation.