Dump Truck Drive Circuit for Smaller Auxiliary Converters
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Solution Overview
Problem
Existing drive systems for dump trucks, particularly those using two-winding induction generators, face challenges in scaling down converters while maintaining efficiency, due to increased reactive electric current flow and power factor drops.
Innovation Solution
A drive system for dump trucks incorporating a two-winding induction generator with a primary winding including a main winding and an auxiliary winding, along with a rectifier, auxiliary converter, traction inverter, auxiliary machine inverter, and a controller that manages a DC-DC converter to supply power from the main side DC bus to the auxiliary side DC bus, thereby reducing the size of the auxiliary converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a two-winding induction generator is used to integrate main generator and auxiliary generator functions, then the generator structure is simplified and slip rings are eliminated, but the converter size increases to handle both power generation functions simultaneously
Solution Approach 1:
The patent divides the converter into two separate units: a main converter connected to the main winding and an auxiliary converter connected to the auxiliary winding. This segmentation allows each converter to be optimized independently for its specific function, preventing the need for a single oversized converter that would be required if both functions were combined in one unit.
Solution Approach 2:
The auxiliary converter serves multiple purposes: it converts power from the auxiliary winding during normal operation and also functions as a control mechanism for the main converter. This multi-functionality reduces the overall system complexity and allows for more efficient power management without requiring additional dedicated components.
2Volume of stationary object
If the auxiliary converter is scaled down to reduce system size, then the overall system becomes more compact, but reactive electric current flow increases and power factor drops
Solution Approach 1:
The patent implements a control mechanism where the auxiliary converter provides feedback to the main converter. This feedback loop allows the system to monitor and adjust for reactive current flow, maintaining power factor within acceptable ranges even when the auxiliary converter is downsized. The control mechanism compensates for the effects of reduced converter size.
Solution Approach 2:
The main converter acts as an intermediary between the auxiliary converter and the main winding. It manages the reactive power flow and coordinates with the auxiliary converter to maintain system stability. This intermediary role allows the auxiliary converter to be smaller while still maintaining reliable power factor through the main converter's power management capabilities.
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 allows for the suppression of reactive electric current flow to the auxiliary converter, preventing power factor drops and enabling the scaling down of the auxiliary converter while maintaining the efficiency of the drive system.
Implementation Method 1
a rectifier that converts AC power generated in the main winding into DC power
Implementation Method 2
an auxiliary converter that converts AC power generated in the auxiliary winding into DC power
Implementation Method 3
a traction inverter that converts the DC power supplied from the rectifier into AC power, and supplies the AC power to a traction motor
Implementation Method 4
an auxiliary machine inverter that converts the DC power supplied from the auxiliary converter into AC power, and supplies the AC power to an auxiliary machine motor
Data Source
AI summary
An object of the present invention is to provide a drive system for a dump truck capable of suppressing increase in size of a converter that controls a two-winding induction generator. To this end, the drive system for a dump truck includes a DC-DC converter connected to a main side DC bus and an auxiliary side DC bus, and a controller controls the DC-DC converter such that electric power of the main side DC bus is supplied to the auxiliary side DC bus via the DC-DC converter.