Drive System Rotor Control via Onboard Sensors
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Solution Overview
Problem
Existing drive systems with three-phase motors and inverters face challenges in reliable operation due to the need for time-critical measured variables to be transmitted from the stator to the rotor, which can lead to inefficiencies and instability in controlling the rotor fields.
Innovation Solution
The drive system uses sensors on the rotor side to determine the required variables exclusively, generating control signals for the rotor winding system based on detected phase current signals and voltages, allowing for the separation of components belonging to different rotor fields and determining load angles and rotor position without transmitting time-critical data from the stator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If time-critical measured variables are transmitted from the stator to the rotor side, then control information can be provided to the rotor, but transmission delays and instability occur
Solution Approach 1:
Instead of transmitting control variables from the stator to the rotor as in conventional systems, the patent inverts the approach by determining all control variables exclusively from sensors on the rotor side. This eliminates the transmission link that causes delays and instability while maintaining complete control capability.
Solution Approach 2:
The patent extracts the time-critical transmission link from the control system by removing the dependency on stator-to-rotor variable transmission. All necessary control information is extracted and processed locally on the rotor side using onboard sensors, eliminating the source of transmission delays.
2Difficulty of detecting and measuring
If sensors are arranged on the stator side, then measurement is simplified, but time-critical data transmission to the rotor is required
Solution Approach 1:
The patent inverts the conventional sensor placement strategy by moving sensors from the stator side to the rotor side. Although this increases measurement complexity slightly, it completely eliminates time-critical data transmission by enabling local processing of all control variables on the rotor side.
Solution Approach 2:
The rotor-side sensors act as intermediaries that provide all necessary measurement data locally on the rotor side. This eliminates the need for data transmission between stator and rotor, as the sensors directly capture the required information at the point of use.
3Measurement precision
If control signals are generated using stator-side variables, then control accuracy is maintained, but transmission delays affect dynamic response
Solution Approach 1:
The patent inverts the control variable source from stator-side variables to rotor-side variables. This maintains measurement precision by using high-quality rotor-side sensors while simultaneously eliminating transmission delays, thereby improving dynamic response speed.
Solution Approach 2:
The patent performs preliminary action by determining all control variables in advance on the rotor side before they are needed for control actions. This eliminates waiting time for data transmission and processing, enabling immediate response to changing conditions.
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 ensures reliable and efficient operation by avoiding the transmission of time-critical data and enabling precise control of the rotor fields, improving the dynamic response and stability of the drive system.
Implementation Method 1
The first three-phase stator winding is connected to a three-phase AC voltage network... a first rotating stator field that is generated by means of the first stator winding
Implementation Method 2
The second three-phase stator winding is connected to the three-phase AC voltage network in such a way that a second rotating stator field rotating in the opposite direction is produced
Implementation Method 3
The at least one inverter is designed to generate control signals for the rotor winding system in such a way that a first rotating rotor field and a second rotating rotor field, which runs counter to the first rotating rotor field, are generated
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a drive system (100) having the following: a three-phase motor (10) which has the following: a shaft (11), a first three-phase stator winding (12) that is to be connected to a three-phase alternating voltage grid, a second three-phase stator winding (13) that is to be connected to the three-phase alternating voltage grid such that a second stator rotating field is produced which rotates in the opposite direction of a first stator rotating field that is generated by means of the first stator winding (12), and a rotor winding system (14) which is mechanically coupled to the shaft (11) in a rotationally fixed manner, and at least one inverter (15) which is mechanically coupled to the shaft (11) in a rotationally fixed manner and is electrically coupled to the rotor winding system (14). The at least one inverter (15) is designed to generate actuation signals for the rotor winding system (15) such that a first rotor rotating field and a second rotor rotating field which rotates opposite the first rotor rotating field are generated, and the at least one inverter (15) is designed to generate the actuation signals for the rotor winding system (14) solely depending on signals detected on the rotor side.