Electric Rotating Machine Variable Voltage Winding
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Solution Overview
Problem
Existing electric rotating machines face limitations in voltage adjustment due to the need for significant design changes or slot modifications when transitioning between different parallel connections of armature windings, which restricts the ability to achieve intermediate output voltages efficiently.
Innovation Solution
The electric rotating machine employs a stator core with equally spaced slots and armature windings composed of serially-connected single-turn coils, allowing for both series and parallel connections to generate output voltages that are integral multiples or fractions of the base voltage by adjusting the number of parallel circuits, thereby enabling intermediate voltage outputs without altering the stator core length or slot count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the number of parallel circuits of armature winding is increased to reduce output voltage, then the output voltage is reduced below dielectric strength, but great design changes such as changing the length of stator core or changing the number of slots are required
Solution Approach 1:
The armature winding is divided into multiple independent single-turn coils that can be selectively connected in series or parallel configurations. Each single-turn coil is a discrete unit that can be arranged to achieve different voltage outputs without modifying the stator core structure.
Solution Approach 2:
The connection configuration of the armature winding is made changeable between series and parallel arrangements, allowing dynamic adjustment of output voltage. This enables the generator to provide intermediate voltage outputs (such as 2/3 of nominal voltage) by reconfiguring the existing windings without physical design changes.
2Use of energy by moving object
If single-turn coils are connected in series to obtain integral multiple voltages, then higher voltages are achieved, but the number of parallel circuits must be changed requiring design modifications
Solution Approach 1:
The same set of single-turn coils serves multiple functions by being connectable in different configurations. The armature winding structure universally supports both series connections for higher voltages and parallel connections for lower voltages, providing versatile voltage adjustment capability from a single design.
3Use of energy by moving object
If the stator core length or number of slots is changed to control output voltage, then voltage control is achieved, but the design complexity and manufacturing cost increase
Solution Approach 1:
Instead of changing physical dimensions of the stator core or number of slots, the invention changes the electrical connection parameters of the armature winding. By altering the series/parallel connection ratio of existing single-turn coils, different output voltages are achieved while maintaining the same physical structure, thereby simplifying manufacturing.
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 flexible voltage adjustment by connecting single-turn coils in series or parallel, reducing AC losses and enhancing efficiency by minimizing interlinking magnetic flux, while maintaining the same output voltage without requiring design changes to the stator core or slot count.
Implementation Method 1
an armature winding that is made with a plurality of serially-connected single-turn coils that are respectively applied to the slots and the serially-connected coils of respective phases are connected in parallel
Data Source
AI summary
An electric rotating machine comprising a stator core having a plurality of slots that are equally spaced on the inner surface of the stator core in the peripheral direction, a rotor that rotates inside the stator core, and an armature winding (40,45) that is applied to each of the slots, wherein the armature winding is made up with a plurality of serially-connected single-turn coils that are respectively applied to the slots and the serially-connected coils of respective phases are connected in parallel.