Flat-Motor Stage Light Pivot for High-Accuracy Rotary Positioning
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Solution Overview
Problem
Existing stage light fixtures face accuracy issues in rotary positioning due to mechanical transmission errors caused by gaps and tooth jumping between belts and gears, leading to inaccuracies in light head or arm positioning, especially at long projection distances.
Innovation Solution
A stage light fixture design where a pivoting member is directly connected to a flat motor's stator or rotor, eliminating the transmission assembly and using an alternating magnetic field to drive rotation, with the rotor arranged outside the stator in a sleeving mode for enhanced stability and accuracy, and bearings for independent rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a transmission assembly (belts or gears) is used to drive the light head or arm, then the motor can be mounted separately, but mechanical transmission errors (gaps and tooth jumping) cause low positioning accuracy
Solution Approach 1:
The patent extracts and eliminates the transmission assembly (belts and gears) from the drive system. By directly connecting the motor's rotor to the light head or arm, the transmission components that cause gaps and tooth jumping are removed, thereby achieving high positioning accuracy without the complexity of mechanical transmission.
Solution Approach 2:
The patent merges the motor and the light head/arm into a direct connection system. The rotor is directly coupled to the pivoting member, eliminating the intermediate transmission assembly. This merging of functions achieves both high positioning accuracy and reduced device complexity.
2Area of stationary object
If a conventional rotating shaft motor is used, then the motor can provide sufficient torque, but the rotating shaft requires additional mounting space and increases motor height
Solution Approach 1:
The patent transitions from a conventional rotating shaft motor to a flat motor with a disc-shaped rotor. This dimensional change allows the rotor to be arranged outside the stator in a planar configuration, reducing the motor's height and mounting space requirements while maintaining sufficient torque output through the direct connection to the pivoting member.
3Stability of the object's composition
If the rotor is arranged inside the stator, then the motor structure is compact, but the rotor may randomly waggle and reduce positioning stability
Solution Approach 1:
The patent inverts the conventional motor structure by arranging the rotor outside the stator rather than inside. This inverted configuration, with the rotor arranged outside the stator in a sleeving mode, prevents random waggling and improves positioning stability while maintaining a compact overall motor volume through the planar arrangement.
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 achieves high-accuracy rotary positioning, reduces the need for additional motor mounting space, and prevents light spot shifting even at long distances, while allowing for a more compact and stable motor installation.
Implementation Method 1
The flat motor includes a stator generating a magnetic field by energization
Implementation Method 2
a rotor arranged outside the stator in a sleeving mode and driven by the magnetic field
Implementation Method 3
the stage light fixture uses the alternating magnetic field on the stator to drive the rotor to rotate
Data Source
AI summary
A stage light fixture with high-accuracy rotary positioning includes a supporting member and a pivoting member pivoted to the supporting member. The pivoting member has at least one light source for generating a lighting effect and is driven to rotate by at least one flat motor. The flat motor includes a stator generating a magnetic field by energization, and a rotor sleeve on the stator and driven by the magnetic field. The pivoting member is fixedly connected with the rotor, and the supporting member is fixedly connected with the stator; or the pivoting member is fixedly connected with the stator, and the supporting member is fixedly connected with the rotor. With respect to the conventional rotating shaft motor, no transmission assembly is provided, a transmission error thus can be avoided to achieve more accurate positioning, and a height of the motor can further be reduced.