Stepping Motor Load Detection Using Induced Coil Voltage
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Solution Overview
Problem
Existing stepping motor control devices have complex detection circuit configurations to accurately detect changes in rotation load, which complicates the process.
Innovation Solution
A stepping motor control device with a simplified detection circuit configuration that includes a drive unit, a control unit, a train wheel with a load gear, a voltage detection unit, and a determination unit. The device detects induced voltage changes to determine mechanical loads and simplify the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex detection circuit configuration is used to accurately detect changes in rotation load, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the detection of induced voltage from multiple coils into a single unified detection circuit. By merging the signal processing functions and using a common detection pathway, the system achieves accurate rotation load detection without requiring separate complex circuits for each coil, thus resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The detection circuit is designed to serve multiple functions: it detects induced voltage from different coils, determines rotation load changes, and identifies gear tooth positions. This multi-functional approach eliminates the need for separate specialized circuits, maintaining high measurement precision while reducing overall device complexity
2Device complexity
If the detection circuit is simplified, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent replaces complex electrical signal processing circuits with a simpler detection approach that utilizes the natural induced voltage signals from the coils. By substituting mechanical/electrical complexity with intelligent signal interpretation, the system maintains measurement precision while achieving circuit simplification
Solution Approach 2:
The system uses the induced voltage naturally generated by the coils during motor operation as the detection signal source. This self-service approach eliminates the need for external complex detection circuits, as the motor's own operation provides the necessary detection signals, thereby reducing device complexity without sacrificing measurement precision
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 solution effectively simplifies the detection circuit configuration while maintaining accurate detection of mechanical loads, improving the efficiency and reliability of the stepping motor control device.
Implementation Method 1
coils generating a magnetic flux for making the rotor rotate
Implementation Method 2
a voltage detection unit that detects an induced voltage generated in the coil when the rotor vibrates
Data Source
AI summary
A stepping motor control device configured to drive a stepping motor having a rotor and a coil includes: a train wheel including a load gear which has a load tooth whose rotation load is different from that of another tooth and in which the rotor has an odd number of rotation steps when the load gear rotates once, and transmitting a rotation force from the rotor to the hand; a voltage detection unit that detects an induced voltage generated at one end portion of a first end portion and a second end portion of the coil when the rotor vibrates; and a determination unit which, based on a result detected by the voltage detection unit, determines a mechanical load received by the rotor due to contact of the load tooth of the load gear with a tooth meshing with the load gear.