Speed Regulator for Rotary Electrical Machine Gear Synchronization
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Solution Overview
Problem
Existing speed control systems for rotating electrical machines, particularly in high-power motor vehicle applications, tend to overshoot setpoints due to derivative action in the closed-loop transfer function, leading to instability during gear synchronization.
Innovation Solution
A speed regulator configuration featuring a pure integrator and gain-based feedback loop, ensuring the closed-loop transfer function lacks zeros in the numerator and behaves as a second-order filter with damping equal to 1, preventing overshoot while maintaining fast dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PI regulator is used for speed control, then the system can maintain speed, but the closed-loop transfer function contains a zero in the numerator which causes overshoot of the setpoint
Solution Approach 1:
The patent changes the regulator structure from a standard PI regulator to a modified configuration where the proportional and integral actions are applied to different error signals. Specifically, the proportional gain K is applied to the speed error (ω* - ω) while the integral gain Ki is applied to the torque error (Te* - Te), fundamentally altering the closed-loop transfer function characteristics to eliminate numerator zeros and prevent overshoot
2Speed
If the proportional gain K is increased to improve response speed, then the system reaches setpoint faster, but the overshoot becomes more severe
Solution Approach 1:
The patent segments the control actions by applying proportional control to speed error and integral control to torque error separately, rather than combining both gains on a single error signal. This segmentation allows independent optimization of response speed and overshoot prevention, as the proportional term provides fast response while the integral term ensures steady-state accuracy without causing overshoot
Data Source
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AI summary
The invention relates mainly to a rotating electrical machine (7) intended to cooperate with a motor vehicle gearbox (1) comprising a plurality of speed ratios (R1-Rn), characterized in that it comprises: - a speed regulator capable of being activated during a synchronization phase between gears of two speed ratios (R1-Rn) during which said rotating electrical machine (7) is driven in speed, - said speed regulator comprising a cascaded integrator with a gain.