Stage Light Motor Assembly With Capacitive Braking on Power Failure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing solutions for preventing stage light fixture components from falling and causing damage during power failures are either expensive, require frequent maintenance due to wear of brake pads, or generate insufficient braking torque, especially when dealing with heavier components.
Innovation Solution
A motor assembly comprising a motor driver, an automatic transfer switch, a capacitive load, and an alternating current motor, where the automatic transfer switch controls the connection of the motor windings to either the motor driver or the capacitive load upon power failure, utilizing the capacitive load to generate a higher braking torque by aligning the phase of the induced current 90° ahead of the induced voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a brake motor with brake pad is used to buffer falling components, then the braking effect is improved, but the device complexity and cost increase, and the brake pad wears over time reducing reliability
Solution Approach 1:
The invention extracts the braking function from a separate brake motor-brake pad system and integrates it into the existing motor structure. By using the motor's own windings as the braking element through capacitive load connection, the design eliminates the need for additional brake pads and mechanical braking components, thereby reducing device complexity while maintaining braking effectiveness
Solution Approach 2:
The motor windings serve dual functions: during normal operation, they function as the motor's driving coils; during power failure, they function as the braking element when connected to the capacitive load. This multi-functionality eliminates the need for separate braking components and reduces overall system complexity
2Reliability
If brake pad is used for collision buffering, then the braking effect is improved, but the maintenance frequency increases due to pad wear
Solution Approach 1:
The motor's own windings provide the braking function without requiring external brake pads that wear out. The capacitive load switching mechanism enables the motor to self-brake during power failure, eliminating consumable parts and reducing maintenance requirements
Solution Approach 2:
The invention avoids using disposable brake pads that wear out and require replacement. Instead, it uses the durable motor windings and a reusable capacitive load switching mechanism, eliminating the need for frequent maintenance of braking components
3Reliability
If motor windings are short-circuited via relay on power failure, then the braking effect is achieved, but the braking torque generated is insufficient for heavy components
Solution Approach 1:
The invention changes the electrical parameter connection by introducing a capacitive load instead of direct short-circuiting. The capacitive connection creates a phase shift that generates stronger electromagnetic braking torque, sufficient to counteract gravity on heavy components during power failure
Solution Approach 2:
The capacitive load is charged during normal motor operation and then discharged during power failure to generate braking torque. This energy recovery and reuse mechanism enhances braking capability without requiring additional energy input
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 proposed motor assembly effectively reduces the falling speed of stage light fixture components during power failures by increasing the braking torque, thereby minimizing impact forces and protecting the components from damage.
Implementation Method 1
the motor is driven to rotate by falling of the components, so that the motor generates an induced current formed by an induced electromotive force
Implementation Method 2
the capacitive load makes the phase of the induced current 90° ahead of the phase of the induced voltage
Implementation Method 3
the directions of the electromotive forces generated by the armature magnetic field of the motor and the primary magnetic field of the permanent magnet are consistent, and a longitudinal magnetization armature reaction thus may be generated
Data Source
AI summary
A motor assembly for slowing down falling speed of a stage light fixture on power failure includes a motor driver, an automatic transfer switch, a capacitive load, and an alternating current motor. In the case that the automatic transfer switch is energized, windings of the alternating current motor are kept connected to the motor driver, and in the case that the automatic transfer switch is deenergized, the windings of the alternating current motor are switched to be connected to the capacitive loads. The motor assembly according to the present disclosure can reduce the falling speed of the stage light fixture in case of the power failure.