Switched Reluctance Motor Controller Regenerative Voltage Management
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Solution Overview
Problem
Existing switched reluctance motor controllers reduce battery life during regenerative control, especially when the battery is fully charged, due to excessive use of negative voltage.
Innovation Solution
A controller for a switched reluctance motor that reduces the application section of negative voltage during regenerative control when the battery is fully charged, delays the excitation start and end angles, and increases the target current value, while expanding the zero voltage application section in the circulation mode to minimize regenerative energy and reduce thermal load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative control is performed with normal negative voltage application section when battery SOC is high, then power recovery efficiency is improved, but battery life is reduced due to excessive charging
Solution Approach 1:
The control device dynamically adjusts the negative voltage application section based on battery SOC. When SOC is high (battery nearly full), the negative voltage application section is reduced compared to normal conditions. This dynamic adjustment allows the system to optimize between power recovery efficiency and battery protection, preventing overcharging while maintaining effective regenerative braking
Solution Approach 2:
The control device changes the parameter of negative voltage application duration based on battery charge state. By reducing the negative voltage application section when SOC reaches a predetermined threshold, the system modifies the electrical parameters applied to the motor coils, thereby controlling the charging current to protect battery life while maintaining regenerative control functionality
2Force
If negative voltage is applied extensively during regenerative control, then regenerative braking effectiveness is improved, but thermal load on motor increases
Solution Approach 1:
The control device applies negative voltage partially rather than continuously during regenerative control. By reducing the negative voltage application section when battery SOC is high, the system avoids excessive action that would generate unnecessary heat, while still maintaining sufficient regenerative braking force through optimized voltage application timing and duration
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 approach reduces the regenerative energy amount, minimizes power recovery, and extends battery life by avoiding excessive negative voltage application and thermal stress, thus improving battery durability and reducing driver discomfort from engine rush-up.
Implementation Method 1
coils wound around the stator and which is mounted on a vehicle as a traveling drive source, the controller including: a control unit performing regenerative control to apply a positive voltage and a negative voltage to the coils
Implementation Method 2
three-phase coils wound around the salient poles of the stator and using the magnetic attractive force generated between the salient poles of the stator and the rotor so as to rotate the rotor
Data Source
AI summary
A controller for a switched reluctance motor, which includes a rotor, a stator, and coils wound around the stator and which is mounted on a vehicle as a traveling drive source, the controller including: a control unit performing regenerative control to apply a positive voltage and a negative voltage to the coils so that a current value of the coils becomes a first target current value in a predetermined regenerative region. Further, when the battery charge state value is a predetermined value or more, the control unit reduces a section where a negative voltage is applied to the coils to be narrower than that in a case where a battery charge state value is less than the predetermined value.