Motor Control Device for Multi-Motor Driven Body
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Solution Overview
Problem
Conventional motor control devices fail to switch the state of motors other than the one causing an alarm from an excited to an un-excited state at an appropriate timing based on physical quantities, leading to adverse effects such as the driven body dropping or increased motor loads when controlling multiple motors driving a single movement shaft.
Innovation Solution
A motor control device that includes a physical quantity detecting unit, an alarm generating unit, a state switching unit, and a state switch timing setting unit to switch the state of the motor other than the one causing the alarm from an excited to an un-excited state based on detected torque, speed, load, or mechanical torsion, ensuring appropriate timing to prevent adverse effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the state of motors other than the one causing alarm is switched from excited to un-excited state at the first timing (alarm generation timing), then the driven body can be prevented from dropping, but the motor and system may suffer adverse effects due to increased torque requirements
Solution Approach 1:
The patent applies dynamics by making the state switch timing adjustable based on physical quantities. Instead of a fixed timing, the system dynamically determines the optimal switching moment by monitoring torque, speed, load, or mechanical torsion, allowing the switching timing to adapt to real-time system conditions and avoid adverse effects while preventing driven body dropping
Solution Approach 2:
The patent changes the parameter of state switch timing from a fixed value to a variable determined by physical quantities such as torque, speed, load, or mechanical torsion. This parameter change allows the system to optimize the switching timing based on actual operating conditions, resolving the contradiction between preventing dropping and avoiding adverse effects
2Object-affected harmful factors
If the state of motors other than the one causing alarm is switched from excited to un-excited state at the second timing (brake operation completing timing), then the motor loads are reduced, but the driven body may drop before the brake operation completes
Solution Approach 1:
The patent implements feedback by continuously monitoring physical quantities (torque, speed, load, or mechanical torsion) and using this information to determine the optimal state switch timing. This feedback mechanism ensures that the switching decision is based on real-time system state, balancing the need to reduce motor loads while maintaining driven body position stability
Solution Approach 2:
The system dynamically adjusts the state switch timing based on monitored physical quantities, allowing the timing to be earlier or later depending on actual conditions. This dynamic approach resolves the contradiction by adapting to whether the system can afford to reduce motor load early or must maintain torque to prevent dropping
3Speed
If one driven body is driven by a plurality of motors, then the acceleration and deceleration performance is improved, but the complexity of controlling motor states during alarm increases
Solution Approach 1:
The patent simplifies the complex control problem by changing the timing parameter from multiple fixed options to a single dynamically determined value based on physical quantities. This unified approach to timing determination reduces control complexity while maintaining the performance benefits of multiple motors
Solution Approach 2:
The patent creates a universal timing determination method that works for all motors regardless of which one caused the alarm or what the specific operating conditions are. This multi-functional approach simplifies control by using the same physical quantity-based logic for all motor state switching decisions
Data Source
AI summary
A state switching unit switches the state of a motor that has caused an alarm, from an excited state to an un-excited state at an alarm generation timing. A state switch timing setting unit sets a state switch timing of switching the state of a motor other than the motor that has caused the alarm, from an excited state to an un-excited state. This setting is made on the basis of a physical quantity concerning at least one of the motor and a driven body. At the set state switch timing, a state switching unit switches the state of the motor other than the motor that has caused the alarm, from an excited state to an un-excited state.