Switched Reluctance Motor Control System for Seamless Speed Transition
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Solution Overview
Problem
Switched reluctance motor systems face challenges in achieving stable operation due to improper switchover between current chopper control and angle position control modes, especially when load changes, leading to fluctuations in torque and rotational speed.
Innovation Solution
A control system comprising a speed regulator, current chopper controller, angle position controller, chopper counter, and settable constant registers allows for automatic switchover and seamless connection between current chopper control and angle position control by dynamically adjusting current chopping limits and turn-on/turn-off angles based on chopper counter values, ensuring smooth transitions across low, medium, and high rotational speed stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If cut-and-try method is adopted to determine turn-on angle and turn-off angle at switchover moment, then smooth switchover between control modes can be achieved under constant load, but torque or rotational speed fluctuation occurs when load changes
Solution Approach 1:
The patent implements feedback by continuously monitoring the chopper counter value and using it to dynamically adjust control parameters. The chopper counter reflects the actual operating state, and this feedback is used to automatically select between current chopper control and angle position control modes, ensuring stable switchover under varying load conditions without manual intervention.
Solution Approach 2:
The patent applies dynamics by making the control parameters (turn-on angle, turn-off angle, current chopping limit) variable rather than fixed. The chopper counter value serves as a dynamic indicator to automatically adjust these parameters in real-time, allowing the system to adapt to changing load conditions and maintain stable operation across different operating points.
2Speed
If current chopper control is used in low speed section and angle position control in high speed section, then wide speed regulation range can be achieved, but improper switchover causes speed regulating system to work unstably
Solution Approach 1:
The patent introduces the chopper counter as an intermediary element that bridges the two control modes. The chopper counter value serves as a mediator to determine when to switch between current chopper control and angle position control, ensuring smooth transition and maintaining system stability across the wide speed regulation range without abrupt changes or oscillations.
Solution Approach 2:
The patent segments the speed regulation range into different sections (low speed and high speed) with different control modes, using the chopper counter to identify transition points. This segmentation allows each control mode to operate optimally in its designated range while the chopper counter ensures coherent switching between segments, maintaining overall system stability.
3Speed
If turn-on angle and turn-off angle are adjusted at switchover moment, then speed regulation can be maintained, but torque fluctuation occurs due to improper adjustment
Solution Approach 1:
The patent uses the chopper counter as a feedback mechanism to monitor the actual operating state and automatically adjust turn-on angle and turn-off angle. This feedback ensures that angle adjustments are made based on real-time conditions rather than predetermined fixed values, maintaining both speed regulation and torque stability during switchover transitions.
Solution Approach 2:
The patent applies preliminary action by pre-establishing the chopper counter as an indicator of operating state before switchover occurs. The chopper counter value is continuously tracked and used to predict the optimal moment for switchover, allowing turn-on and turn-off angles to be adjusted in advance in a coordinated manner, preventing torque fluctuations during the transition.
Data Source
AI summary
A switch reluctance motor wide speed-regulation range cross-control method, the switch reluctance motor wide speed-regulation range control system consisting of a revolving speed regulator, a current chopper controller, an angle position controller, a chopper counter, a comparison selector and two resettable constant registers; the chopper counter counts the current chopping number of each electrical period, and according to the comparison result between a counting value of the chopper counter and a constant value set by the two constant registers, the comparison selector selects the current chopper controller or the angle position controller, such that when in the three phases of low revolving speed, medium revolving speed and high revolving speed or in the runtime of acceleration, deceleration and uniform velocity, the current chopper controller and the angle position controller can automatically switch, and seamlessly connect without being affected by load change, and switching from a turn-on angle to a turn-off angle will not cause fluctuation of torque or revolving speed of a switch reluctance motor, thus the switch reluctance motor system runs stably and has good value for engineering application.