Electric Machine Vector Control for Torque Ripple Damping
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Solution Overview
Problem
Existing electric motors and generators face challenges in efficiently controlling torque and maintaining synchronicity between stator and rotor magnetic fields without relying on rare-earth magnets or separate exciter circuits, and in managing torque ripples and transient damping across a wide frequency range.
Innovation Solution
The implementation of an electric machine with a field wound synchronous motor design featuring shorted, concentrated windings and a controller that adjusts current magnitude and angle in response to operating conditions, allowing for effective transient damping and torque control without rare-earth magnets or separate exciter circuits, utilizing direct coupling between stator and rotor for power and signal transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional electric motors use rare-earth magnets and separate exciter circuits for torque control, then torque control capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes rare-earth magnets and separate exciter circuits from the motor structure, extracting these complex components while maintaining torque control capability through alternative means (electromagnetic induction and controller-based current adjustment)
Solution Approach 2:
The stator windings serve multiple functions: they produce the magnetic field for torque generation and simultaneously serve as the excitation source for the rotor, eliminating the need for separate exciter circuits
2Adaptability or versatility
If electric motors operate across a wide frequency range, then adaptability is improved, but transient damping and torque ripple control become more difficult
Solution Approach 1:
The controller dynamically adjusts current magnitude and angle in real-time based on operating conditions, enabling effective transient damping and torque ripple control across a wide frequency range through adaptive parameter modification
Solution Approach 2:
The system uses feedback control mechanisms to monitor and adjust stator current parameters, maintaining stable operation and reducing torque ripples across varying frequency 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 solution enables efficient torque control and reduced torque ripples, enhances transient damping across a wide frequency range, and eliminates the need for rare-earth magnets and separate exciter circuits, improving motor performance and reliability.
Implementation Method 1
Electric current is translated into electromagnetic fields which exert a mechanical force, or torque, between the stator and the rotor
Implementation Method 2
The rotor defines a field energizable by magnetic fields produced by the stator windings to produce relative motion between the rotor and the stator
Data Source
AI summary
An electric machine includes a stator and a rotor energizable by magnetic fields produced by the stator when receiving a stator current to produce relative motion between the rotor and the stator. A controller is configured to send the stator current through the stator at a current angle measured from the closest one of a pole of the rotor, determine a desired operational output of the electric machine, and determine a desired rotor motion corresponding to the desired operational output of the electric machine. The controller is further configured to calculate a vector control modulation applied to the stator that elicits the desired rotor motion, and adjust the current angle of the stator current based on the vector control modulation to cause the rotor to perform the desired rotor motion and achieve the desired operational output of the electric machine.