Switchable Winding Power Supply Circuit for Wide-Speed Motor Operation
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Solution Overview
Problem
Existing rotary electric machines face challenges in achieving high efficiency over a wide speed range, leading to increased manufacturing costs when multiple machines with different characteristics are used, and existing power supply devices do not effectively impart diverse characteristics to a single rotary electric machine.
Innovation Solution
A power supply circuit and rotary electric machine system that includes a first phase winding with two winding units and a second phase winding with two additional winding units, where the power supply circuit has two parallel-connected circuits with switching elements and free-wheeling diodes, allowing for operation in two modes: series connection for low speed and parallel connection for high speed, optimizing torque and output performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple rotary electric machines with different characteristics are mounted to achieve high efficiency over wide speed range, then efficiency is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies multi-functionality by enabling a single rotary electric machine to operate with different winding configurations (series and parallel connections) that provide different characteristics. The power supply circuit can switch between connecting winding units in series for low-speed high-torque operation and in parallel for high-speed operation, allowing one machine to replace multiple machines with different characteristics, thereby reducing manufacturing cost while maintaining high efficiency across wide speed range
2Force
If series connection is used for low speed operation, then torque performance is improved, but speed range is limited
Solution Approach 1:
The patent applies dynamics by implementing a switchable power supply circuit that can dynamically change the connection configuration of winding units based on operating conditions. The circuit can switch between series connection for low-speed high-torque operation and parallel connection for high-speed operation, enabling the rotary electric machine to adapt its characteristics to different speed ranges and maintain optimal performance across the entire speed range
3Power
If parallel connection is used for high speed operation, then output performance is improved, but torque performance at low speed deteriorates
Solution Approach 1:
The switchable power supply circuit dynamically adjusts the winding connection configuration based on operating speed. At high speeds, the circuit connects winding units in parallel to optimize output performance, while at low speeds, it switches to series connection to maintain adequate torque performance, thus resolving the trade-off between output performance and low-speed torque
Data Source
AI summary
A power supply circuit includes a first and second circuits connected to a first and second phase windings of a rotary electric machine, respectively. The first circuit includes first to fourth arms and a first switch. The midpoints of the first and second arms are connected to respective ends of a first winding unit, the midpoints of the third and fourth arms are connected to respective ends of a second winding unit, and the first switch is connected between the midpoints of the second and third arms. The second circuit includes fifth to eighth arms and a second switch. The midpoints of fifth and sixth arms are connected to respective ends of a third winding unit, the midpoints of seventh and eighth arms are connected to respective ends of a fourth winding unit, and the second switch is connected between the midpoints of the sixth and seventh arm.