Stepper Motor Driving Device with Gear Feedback Protection
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Solution Overview
Problem
Conventional driving devices with stepper motors lack feedback mechanisms, leading to potential damage to the circuit board and motor when gears operate abnormally, as there is no response or feedback to indicate abnormal conditions.
Innovation Solution
Incorporating a sensing device with a sensor and detector connected to the gear reduction unit, which sends a signal to the circuit board to control power supply to the stepper motor, using magnetic or optical induction, ensuring power is cut off when the gears stop, thus protecting the motor and circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensing device with sensor and detector is added to provide feedback on gear operation, then the reliability and protection of the stepper motor and circuit board is improved, but the device complexity increases
Solution Approach 1:
A sensing device comprising a sensor and at least one detector is integrated into the transmission device. The detector is connected to one of the gears and when the gear drives the detector to pass the sensor, the sensor sends a signal to the circuit board indicating normal operation. When the gear stops or operates abnormally, no signal is sent and the circuit board cuts off power to the stepper motor, preventing damage.
2Productivity
If continuous power is supplied to the stepper motor to maintain driving capability, then the productivity and responsiveness is improved, but the risk of damage under abnormal conditions increases
Solution Approach 1:
The power supply to the stepper motor is made dynamic rather than static. The circuit board continuously monitors signals from the sensing device and adjusts the power supply state accordingly - providing power when the gear is rotating normally (detector passing sensor) and cutting off power when the gear stops or operates abnormally (no signal from sensor).
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 provides a protective mechanism that prevents damage to the stepper motor and circuit board by ensuring power is only supplied when the gears are functioning correctly, enhancing the reliability and safety of the driving device.
Implementation Method 1
using magnetic or optical induction
Implementation Method 2
using magnetic or optical induction
Data Source
AI summary
A driving device includes a case with a cover mounted thereto. A transmission device is received in the case and has a stepper motor and a gear reduction unit which includes multiple gears engaged with each other. The stepper motor drives the gear reduction unit which is connected to an object. A circuit board is connected with the transmission device and provides power to the stepper motor and controls the stepper motor. A sensing device has a sensor and a detector which is connected to one of the gears of the gear reduction unit. When the gear reduction unit drives the detector to pass the sensor, the sensor sends a signal to the circuit board which keeps on providing the power to the stepper motor. When no signal is sent to the circuit board by the sensor, the circuit board cuts off the power to the stepper motor.