Rotor Speed Control Switching for Resonant-Range Stability
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Solution Overview
Problem
Existing control systems for electric motors in rotor-driven aircraft struggle to appropriately switch between rotational speed control and constant torque control, leading to instability and inaccurate control when the rotor rotational speed falls within a resonant range.
Innovation Solution
A control device and method that determines whether to perform rotational speed control or constant torque control based on the rotor's rotational speed, switching between the two controls to maintain stability and accuracy by using a determination unit and control unit to execute the appropriate control mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rotational speed control is used to control the electric motor, then the rotor can be controlled to rotate at a target rotational speed, but control instability and inaccuracy occur when the rotor rotational speed falls within a resonant range
Solution Approach 1:
The control device dynamically switches between rotational speed control and constant torque control based on the rotor's operational state. When the rotor enters a resonant speed range, the system transitions from rotational speed control to constant torque control, adapting the control strategy to the current conditions to maintain stability and accuracy.
Solution Approach 2:
The system changes the control parameter strategy by switching between two different control modes (rotational speed control and constant torque control) depending on the rotor speed range. This parameter change allows the system to overcome the limitations of single-mode control in resonant conditions.
2Reliability
If constant torque control is used to control the electric motor, then the electric motor maintains constant torque regardless of rotational speed, but the rotor cannot be precisely controlled at target rotational speeds
Solution Approach 1:
The control device dynamically selects between constant torque control and rotational speed control based on the rotor's operational state. When the rotor is operating outside the resonant range, the system uses rotational speed control for precision; when inside the resonant range, it switches to constant torque control for stability.
Solution Approach 2:
The system changes the control parameter strategy by switching between two different control modes (rotational speed control and constant torque control) depending on the rotor speed range. This parameter change allows the system to overcome the limitations of single-mode control in resonant conditions.
3Device complexity
If a single control mode is used for all rotor speeds, then the control system is simple, but control value divergence occurs when the rotor rotational speed is within the resonant range
Solution Approach 1:
The control device dynamically switches between rotational speed control and constant torque control based on the rotor's operational state. When the rotor enters a resonant speed range, the system transitions from rotational speed control to constant torque control, adapting the control strategy to the current conditions to maintain stability and accuracy.
Solution Approach 2:
The control device monitors the rotor's operational state and uses this feedback to determine which control mode to employ. By detecting whether the rotor speed is within the resonant range, the system adjusts its control strategy accordingly, using feedback to prevent control value divergence.
Data Source
AI summary
A control device for controlling an electric motor that rotates a rotor, the control device including: a determination unit configured to determine control to be performed based on a rotational speed of the rotor, the control being either rotational speed control for controlling the electric motor so as to rotate the rotor at a target value of the rotational speed of the rotor or constant torque control for controlling the electric motor at a constant torque regardless of the rotational speed of the rotor; and a control unit configured to perform one of the rotational speed control or the constant torque control in accordance with a determination result of the determination unit.