Comminuting Machine Drive System Frictionless Braking
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Solution Overview
Problem
Existing comminuting machines face challenges in controlling the starting and stopping of disc rotors, leading to inefficient operation and potential damage due to abrupt changes in rotational speed.
Innovation Solution
A disc rotor drive system incorporating a slip-ring motor with primary and secondary rheostats, along with a frictionless braking mechanism, allows for controlled deceleration and shutdown of the rotor, reducing wear and tear by gradually reducing rotational speed before stopping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a disc rotor is started and stopped periodically during operation, then the comminuting machine can process different materials and adjust to varying production demands, but abrupt changes in rotational speed cause mechanical stress and wear
Solution Approach 1:
The rheostat is engaged before the disc rotor comes to a complete stop, initiating a gradual deceleration process. This preliminary action allows the motor to slow down progressively through controlled electrical resistance rather than abrupt mechanical stopping, reducing stress on the rotor and drive system during periodic operation cycles
Solution Approach 2:
The system changes the electrical parameter (resistance) by engaging the rheostat to alter the motor's deceleration characteristics. By adjusting the electrical resistance in the motor circuit, the rotational speed is gradually reduced from operating speed to zero, transforming an abrupt mechanical stop into a controlled electrical deceleration process that minimizes mechanical wear
2Ease of operation
If conventional starting and stopping methods are used, then the system is simple to operate, but the abrupt changes in rotational speed lead to inefficient operation and potential damage
Solution Approach 1:
The rheostat serves as an intermediary device between the motor and the disc rotor, mediating the transition from full power to stopped state. This intermediate electrical resistance element allows for gradual speed reduction without complicating the overall control system, maintaining ease of operation while significantly improving operational efficiency by preventing abrupt stops
3Device complexity
If conventional starting and stopping methods are used, then the control system is simple, but the abrupt changes cause potential damage to the disc rotor
Solution Approach 1:
The rheostat acts as an intermediary control element that protects the disc rotor during speed transitions. By inserting electrical resistance into the motor circuit, it gradually reduces power delivery and rotational speed, preventing sudden mechanical shocks to the rotor while adding only minimal complexity to the control system through a single switchable component
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 system enables controlled starting and stopping of the disc rotor, enhancing operational efficiency and extending the lifespan of the machine by minimizing mechanical stress and wear.
Implementation Method 1
A rheostat brake is coupled to the motor and includes a primary rheostat and a secondary rheostat disposed in line with the primary rheostat to provide a compounded resistance to the motor
Data Source
AI summary
A comminuting machine includes a frame, a comminuting rotor coupled to the frame, and a rotary drive coupled to the rotor. The rotary drive including a controller, a multi-phase motor connected to the controller, a set of contactors disposed between the controller and the multi-phase motor for selectively providing driving motive force to the multi-phase motor, and at least one rheostat disposed between the controller and the multi-phase motor, in parallel with the first set of contactors, for selectively providing a stopping resistance to the multi-phase motor to effect frictionless braking of the comminuting rotor, wherein the controller is configured to operate the set of contactors and the at least one rheostat to single phase lines of the multi-phase motor for providing the stopping resistance.