Electric Motor Controller Gate Voltage Management
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Solution Overview
Problem
Existing electric motor controllers consume excessive energy due to continuous voltage requirements for protective circuits, leading to increased fuel consumption and pollutant emissions, especially in motor vehicles where many electric motors operate intermittently.
Innovation Solution
A controller with a protective circuit using a field effect transistor and a smoothing capacitor, controlled by a pulse-width modulated signal, reduces energy consumption by periodically charging the capacitor to maintain the required voltage, allowing for reduced current flow through the transistor, and includes a forward diode to prevent energy discharge during modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective circuit continuously holds the gate voltage above the plateau voltage, then the field effect transistor remains reliably conductive, but excessive energy is consumed
Solution Approach 1:
The control unit applies periodic voltage pulses to the gate instead of continuous voltage. The smoothing capacitor maintains the gate voltage above the plateau voltage between pulses by storing charge, enabling periodic rather than continuous energy consumption while ensuring reliable transistor conduction during operation
Solution Approach 2:
The smoothing capacitor is pre-charged during the pulse width modulation active phase to store sufficient energy. This preliminary charge accumulation ensures that the gate voltage remains above the plateau voltage throughout the required period without needing continuous external power supply
2Adaptability or versatility
If the controller operates with multiple electric motors in motor vehicles, then vehicle functions are adequately controlled, but total energy consumption and emissions increase significantly
Solution Approach 1:
Each controller operating with multiple electric motors implements periodic voltage pulsing instead of continuous voltage supply. When multiplied across numerous motor controllers in a vehicle, the cumulative energy savings translate to reduced fuel consumption and lower pollutant emissions from the vehicle's auxiliary power consumption
Solution Approach 2:
The smoothing capacitor serves itself by continuously maintaining the gate voltage above the plateau voltage through its stored charge. This self-maintaining mechanism eliminates the need for continuous external energy input, and when implemented across multiple controllers, the aggregate energy conservation significantly reduces vehicle fuel consumption and emissions
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 significantly reduces electrical energy usage, contributing to lower fuel consumption and reduced emissions by minimizing standby current draw and allowing the controller to operate efficiently with fewer additional components, making it suitable for various electric motors in motor vehicles.
Implementation Method 1
a smoothing capacitor for charge storage being provided at the gate
Implementation Method 2
In order to switch on the field effect transistor, voltage at the gate must exceed a predefined plateau voltage. If at least the plateau voltage is present, a leakage current flows from the gate through the field effect transistor
Implementation Method 3
a forward diode is provided between the control unit and the gate in order to prevent a discharge of the smoothing capacitor during a time interval of the pulse width modulation
Data Source
AI summary
A controller for an electric motor includes a protective circuit for limiting current or for polarity reversal protection, the protective circuit including a field effect transistor having a gate. The protective circuit further includes a control unit for providing a control voltage for the gate, a smoothing capacitor for charge storage being provided at the gate.