Inverter Control Apparatus for Electric Motor Efficiency
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Solution Overview
Problem
Electric vehicles using synchronous one-pulse control mode experience noise, vibration, and reduced motor efficiency, which degrade overall performance.
Innovation Solution
A control apparatus that dynamically selects between one-pulse control and pulse-width modulation control for an inverter based on motor drive torque, rotation speed, and DC voltage, utilizing sensor learning information to optimize efficiency and minimize noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If synchronous one-pulse control mode is used, then device complexity is reduced, but noise and vibration increase
Solution Approach 1:
The patent implements dynamic switching between one-pulse control mode and PWM control mode based on real-time motor operating conditions. The control apparatus determines the appropriate control mode by evaluating motor speed, torque requirements, and current conditions, transitioning from static to dynamic control strategy optimization.
Solution Approach 2:
The patent changes the control parameter (control mode) based on operating conditions. It switches between one-pulse control (simpler, lower complexity) and PWM control (more complex, lower noise/vibration) depending on motor speed, torque demand, and current levels, optimizing the trade-off between complexity and harmful factors.
2Loss of energy
If synchronous one-pulse control mode is used, then switching losses are reduced, but motor efficiency deteriorates
Solution Approach 1:
The control apparatus dynamically adjusts the control mode based on real-time motor operating conditions including speed, torque, and current. It switches between one-pulse control (lower switching losses) and PWM control (higher efficiency) to optimize the energy trade-off dynamically rather than using a fixed mode.
Solution Approach 2:
The patent changes the control parameter (control mode) based on operating conditions such as motor speed, torque requirements, and current levels. This allows the system to minimize switching losses at certain operating points while maintaining high efficiency at others, resolving the contradiction between energy loss and efficiency.
3Ease of operation
If synchronous one-pulse control mode is used, then control simplicity is improved, but overall performance deteriorates
Solution Approach 1:
The patent implements a dynamic control strategy that automatically selects between one-pulse control mode (simpler) and PWM control mode (more sophisticated) based on real-time motor operating conditions. This dynamic adaptation maintains control simplicity where possible while ensuring performance reliability when needed.
Solution Approach 2:
The control apparatus changes the control mode parameter based on evaluated conditions including motor speed, torque requirements, and current levels. This allows the system to maintain ease of operation through simple control logic while achieving reliable overall performance through conditional switching to more sophisticated control methods.
Data Source
AI summary
A control apparatus controls an inverter which outputs electric power to an electric motor. The control apparatus determines which one of a one-pulse control and a pulse-width modulation control is employed as a control method of the inverter in accordance with a predetermined condition based on an electric motor drive torque of the electric motor, a rotation number of the electric motor, and a DC voltage of the electric motor.