Stepping Motor Coil Impedance Switching for Energy Loss Reduction
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Solution Overview
Problem
Conventional stepping motors with two coils experience energy loss due to reactance in one coil when driving pulses are applied to the other coil, obstructing rotor rotation and requiring additional energy for rotation.
Innovation Solution
A stepping motor design with multiple coils and a switching mechanism that applies driving pulses to only one coil while switching the other coils into a high impedance state, reducing reactance and energy loss during rotor rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If driving pulses are applied to one coil while the other coil remains connected to the circuit, then the rotor can rotate, but reactance occurs in the non-driven coil which obstructs rotation and consumes power
Solution Approach 1:
The patent extracts the non-driven coil from the active circuit by switching it to a high impedance state, removing the source of reactance. The switching mechanism isolates the non-driven coil from the circuit loop, eliminating the harmful reactance effect while maintaining the driven coil's functionality for rotor rotation.
Solution Approach 2:
The patent implements dynamic switching of coil impedance states based on which coil is currently being driven. The switching mechanism dynamically changes the electrical state of coils - one coil is in low impedance state for active driving while the other is in high impedance state to prevent reactance, optimizing performance throughout the rotation cycle.
2Device complexity
If both coils are connected to the circuit all the time, then the motor structure is simple, but reactance in the non-driven coil obstructs rotor rotation and requires additional energy
Solution Approach 1:
The patent extracts the non-driven coil from the active circuit loop by switching it to high impedance state, removing the source of energy-wasting reactance. This selective isolation eliminates the harmful effect while maintaining a relatively simple overall structure through the use of switching elements.
Solution Approach 2:
The patent changes the electrical impedance parameter of the non-driven coil from low impedance (when connected) to high impedance (when switched off). This parameter change effectively removes the coil from the circuit loop, preventing reactance and reducing energy loss without requiring complete removal of the coil structure.
3Loss of energy
If the switching mechanism switches non-driven coils to high impedance state, then energy loss is reduced, but the device complexity increases
Solution Approach 1:
The patent extracts only the essential switching function needed to isolate the non-driven coil, implementing a minimal switching mechanism that connects or disconnects the coil from the circuit loop. This selective approach reduces energy loss while adding only the necessary complexity for the switching function.
Solution Approach 2:
The patent applies the switching mechanism locally to only the non-driven coil, leaving the driven coil's circuit path unchanged. This localized approach minimizes the overall device complexity by modifying only the specific part of the circuit where reactance occurs, rather than redesigning the entire circuit system.
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
The motor efficiently rotates the rotor by a predetermined step angle with reduced power consumption, achieving high-speed rotation with minimized energy loss.
Implementation Method 1
a stepping motor including a rotor, a plurality of coils and a switching mechanism, and the stepping motor simultaneously or sequentially applies driving pulses to the coils to rotate the rotor
Implementation Method 2
When driving pulses are applied to one of the coils, the inductance occurs in the other coil in response to the rotation of the rotor. Such inductance obstructs the rotation of the rotor.
Data Source
AI summary
Disclosed is a stepping motor including a rotor, a plurality of coils and a switching mechanism. The stepping motor simultaneously or sequentially applies driving pulses to the coils to rotate the rotor by a predetermined step angle, and while the driving pulses are being applied to part of the coils, the switching mechanism switches the rest of the coils other than the part of the coils driven by the driving pulses into a high impedance state.