Adaptive Motor Control Switching Modes for Accuracy
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Solution Overview
Problem
Existing control strategies for electrically commutated motors, such as single-phase and multiple-phase controls, face challenges in operational reliability at low rotational speeds and under load, and exhibit inadequate control accuracy due to mechanical manufacturing tolerances and sensor inaccuracies, especially in digital control systems.
Innovation Solution
An adaptive control system that employs sensors to detect control deviations and dynamically selects between single-phase and multiple-phase modes of operation based on the magnitude of the control deviation, using a control deviation evaluation element to switch between modes to ensure high control stability and accuracy, particularly at low rotational speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-phase control is used, then control simplicity is maintained, but control accuracy deteriorates at low rotational speeds and under load
Solution Approach 1:
The control system dynamically switches between single-phase and multiple-phase control modes based on operating conditions (rotational speed and load). At low speeds and high loads, the system transitions to multiple-phase control to improve accuracy, while at normal operating conditions it uses single-phase control to maintain simplicity. This dynamic adaptation resolves the contradiction by adjusting the control complexity according to actual operational needs.
2Measurement precision
If multiple-phase control is used, then control accuracy improves, but control stability deteriorates in stationary state due to phase asymmetries
Solution Approach 1:
The system dynamically selects control modes based on real-time operating conditions. In stationary state with constant rotational speed and small loads, the system uses single-phase control to avoid the stability issues caused by phase asymmetries. When disturbances occur or rotational speed changes, it switches to multiple-phase control to improve accuracy and response. This dynamic selection resolves the contradiction by using each control mode only when its advantages are needed.
3Extent of automation
If digital control system is used, then automation is improved, but control accuracy deteriorates due to inadequate handling of mechanical tolerances and sensor inaccuracies
Solution Approach 1:
The control system changes its operational parameters (switching between single-phase and multiple-phase control modes) based on detected operating conditions. This parameter change allows the digital control system to adapt to mechanical tolerances and sensor inaccuracies by using multiple-phase control when higher precision is needed and single-phase control when standard precision suffices, thereby maintaining both automation and accuracy.
Data Source
AI summary
An electrically commutated motor comprises a plurality of stator phases and a rotor. Further, sensors for detecting the control deviation of the rotor in relation to the stator phases are provided. A phase control unit controls the stator phase rotary field depending on the detected control deviation. The phase control unit comprises a single-phase controller for a single-phase mode of operation, and a multiple-phase controller for a multiple-phase mode of operation. Further, a control deviation evaluation element is provided which evaluates the magnitude of the control deviation, and selects, depending on the evaluation result, the single-phase mode of operation or the multiple-phase mode of operation.