Mobile Robot Voltage Conversion for Stable Motor Drive
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Solution Overview
Problem
Existing walking robots experience unstable driving and reduced accuracy due to lower battery voltage as the battery drains, leading to inefficient motor operation.
Innovation Solution
Incorporation of a voltage conversion unit that adjusts and stabilizes the voltage output from the battery to the motor drive circuit, ensuring consistent power supply to the motor, even at lower battery levels, using a combination of step-up and step-down DC/DC conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the battery output voltage is directly applied to the motor, then the device complexity is reduced, but the driving stability and accuracy deteriorate when battery voltage drops
Solution Approach 1:
A voltage conversion unit is introduced as an intermediary component between the battery and the motor drive circuit. This unit converts the battery output voltage to a stable rated voltage, ensuring consistent motor operation even when battery voltage drops. The voltage conversion unit acts as a mediator that isolates the motor system from battery voltage fluctuations, resolving the contradiction between device simplicity and driving stability.
2Device complexity
If the battery output voltage is directly applied to the motor, then the device complexity is reduced, but the driving accuracy deteriorates when battery voltage drops
Solution Approach 1:
The voltage conversion unit serves as an intermediary that maintains rated voltage output regardless of battery voltage variations. By converting the unstable battery voltage to a stable rated voltage, the unit preserves motor driving accuracy throughout the battery discharge cycle, eliminating the need for complex voltage compensation algorithms while maintaining precision.
3Reliability
If voltage conversion unit is added to maintain stable voltage, then the driving stability is improved, but the device complexity increases
Solution Approach 1:
The voltage conversion unit dynamically adjusts its conversion ratio based on the battery voltage level to maintain a constant rated voltage output. By changing the conversion parameter (conversion ratio) in response to battery voltage variations, the system achieves stable motor operation without requiring complex control algorithms or multiple voltage regulation stages, thus limiting the increase in device complexity.
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 solution maintains stable and accurate motor operation by maintaining a rated voltage for the motors, extending the time for stable driving and preventing excessive regeneration power from affecting the system.
Implementation Method 1
a voltage conversion unit that converts and outputs a voltage output by the battery to the motor drive circuit
Data Source
AI summary
A mobile robot includes a robot including a robot arm, a motor that drives the robot arm by electric power supplied from a battery, a motor drive circuit that controls driving of the motor, and a voltage conversion unit that converts and outputs a voltage output by the battery to the motor drive circuit, and a vehicle for mounting robot having a movement mechanism and a coupling unit to which the robot is coupled, and moving the robot.