Vehicle Door Drive Braking Using Motor Winding Heat Dissipation
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Solution Overview
Problem
Existing electric drive systems for vehicle entry or door systems face challenges in efficiently absorbing energy during braking, particularly in scenarios like vehicle inclination or vandalism, due to limited capacity of intermediate circuit capacitors and the use of additional components like braking resistors, which are costly and space-consuming.
Innovation Solution
A method that converts excess energy into heat using the inherent ohmic resistance of the drive system components, such as motor windings and semiconductor switching elements, by injecting an alternating current, allowing energy absorption without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacity of the intermediate circuit capacitor is increased to handle vandalism cases, then the energy absorption capability is improved, but the installation space and cost increase significantly
Solution Approach 1:
The patent converts the harmful effect of ohmic losses (which normally waste energy as heat) into a beneficial energy absorption mechanism. By intentionally injecting alternating current during braking, the system uses the inherent resistance of motor windings and semiconductor switching elements to dissipate regenerative energy as heat, thereby protecting the intermediate circuit capacitor from overload without requiring increased capacitor capacity.
2Reliability
If additional braking resistors are added to increase energy absorption capability, then the reliability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent makes the drive system's existing components serve a dual function: the motor windings and semiconductor switching elements not only perform their primary drive control functions but also act as energy dissipation elements during braking. By controlling the injection of alternating current, the system uses its own inherent resistance to absorb regenerative energy, eliminating the need for separate braking resistors and reducing overall system complexity.
Solution Approach 2:
The patent enables the motor windings and semiconductor switching elements to perform multiple functions: they serve both as drive control components and as energy absorption elements. This multi-functionality allows the same components to operate in different modes (motor and generator) and to handle both propulsion and braking energy management, thereby eliminating the need for dedicated braking resistance components.
3Reliability
If the intermediate circuit capacitor is designed for maximum energy absorption, then the reliability under extreme conditions is improved, but the cost increases
Solution Approach 1:
The patent converts the normally harmful ohmic losses into a useful energy absorption mechanism. By intentionally utilizing the resistance of existing components and injecting alternating current, the system dissipates regenerative energy as heat, protecting the intermediate circuit capacitor from overload without requiring an oversized capacitor design, thereby reducing manufacturing costs.
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
Ensures reliable, efficient, and secure operation by effectively managing energy absorption, preventing thermal overload, and maintaining system integrity without additional hardware, thus ensuring safe and durable operation.
Implementation Method 1
converted into heat in a controlled manner by an ohmic resistor of the drive system by injecting an alternating current into the drive system
Data Source
AI summary
A method for absorbing energy in an electric drive system, particularly a drive system for operating an entry system or door system of a vehicle, the system: includes an electric drive motor for driving a drive body; and a motor control circuit for controlling the drive of the drive motor. Electric energy is supplied in a controlled manner to the drive motor via the motor control circuit in a driving operating mode and electric energy is absorbed by the drive motor via the motor control circuit in a braking operating mode. Optionally at least one part of the absorbed energy is converted into heat in a controlled manner by an ohmic resistor of the drive system by injecting an alternating current into the drive system. An electric drive system is related, particularly a drive system for operating an entry system or door system of a vehicle, controlled by the method.