Motor Control System Winding Segmentation for High-Speed Operation
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Solution Overview
Problem
Existing motor control systems face limitations in increasing rotation speed beyond a certain voltage limit due to counter electromotive force, leading to reduced efficiency and limited operating intervals, as they require additional current to generate a weak magnetic field.
Innovation Solution
A motor control system with a switching controller that reduces the number of active windings by 1/3 during high-speed operation, utilizing a stator with hairpin wires and an inverter to control the turning-on and turning-off of motor windings, allowing for efficient torque and speed adjustments between low-speed and high-speed modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the rotation speed of the rotor is increased, then the counter electromotive force increases, but the voltage reaches its upper limit and speed cannot be increased further
Solution Approach 1:
The patent segments the winding structure into multiple independent winding groups that can be selectively activated or deactivated. Each winding group can be controlled independently through switching devices, allowing the system to adjust the total number of active windings based on operating conditions such as rotation speed and torque requirements.
Solution Approach 2:
The patent implements dynamic control of the winding configuration by allowing real-time switching between different winding group combinations. The switching controller adjusts which winding groups are active based on detected rotation speed and torque demands, enabling the motor to adapt its electrical characteristics to match operational requirements.
2Speed
If weak magnetic force is used to decrease counter electromotive force, then rotation speed upper limit increases, but additional current is required and efficiency decreases
Solution Approach 1:
The patent divides the total winding into multiple winding groups that can be selectively activated. By deactivating certain winding groups during high-speed operation, the system reduces the total number of active windings, which decreases counter electromotive force without requiring additional current for weak magnetic field generation.
Solution Approach 2:
The patent changes the effective number of windings as a controllable parameter based on operating conditions. By dynamically adjusting which winding groups are active, the system can optimize the balance between counter electromotive force and efficiency for different rotation speeds and torque requirements.
3Speed
If weak magnetic force method is used to increase rotation speed, then speed gain is limited, but operating interval cannot be expanded substantially
Solution Approach 1:
The patent segments windings into multiple controllable groups that can be activated in different combinations. This allows the motor to operate efficiently across a wide range of speeds and torque conditions by selecting appropriate winding group configurations, substantially expanding the usable operating interval.
Solution Approach 2:
The patent creates a multi-functional winding system where the same physical windings can serve different purposes depending on which groups are activated. The system can provide high torque at low speeds with all windings active, or high speed at reduced torque with fewer windings active, making it adaptable to diverse operating 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 configuration decreases counter electromotive force, increases rotation speed, and enhances efficiency by reducing copper losses, enabling higher top speeds and expanded operating intervals while maintaining torque output.
Implementation Method 1
an inverter connected to the motor windings, the inverter including a switching controller configured to control the turning-on and turning-off of the motor windings
Implementation Method 2
Phase current is applied to the copper wires in the slots to generate a rotating magnetic field, thereby generating the electromotive force needed to rotate the rotor
Implementation Method 3
Phase current is applied to the copper wires in the slots to generate a rotating magnetic field, thereby generating the electromotive force needed to rotate the rotor
Implementation Method 4
As the rotation speed of the rotor increases, the counter electromotive force in the electric motor will gradually increase
Data Source
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AI summary
A motor control system includes an electric motor and inverter. The electric motor includes a stator, a rotor, and a winding structure. The stator includes an iron core with a plurality of slots formed therein along a radial direction of the stator. The winding structure has a plurality of hairpin wires with pins disposed in the slots. The winding structure is configured to provide a plurality of phase windings and each phase winding includes a plurality of motor windings. The inverter includes a switching controller configured to control the turning-on and turning-off of the motor windings of each phase winding of the winding structure. When the electric motor operates in a high-speed mode, the switching controller controls the turning-on and turning-off of the motor windings of each phase winding such that a number of the phase windings turned-on is 1/3 less than a number of all the phase windings.