Variable-Voltage DC Motor Drive for Higher Torque Across Speeds
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Solution Overview
Problem
Conventional DC motor driving systems, which operate under constant voltage, are limited in increasing torque beyond a certain point, restricting the motor's applicability.
Innovation Solution
A DC motor driving system and method that utilizes a power supply device with variable-voltage characteristics, controlled by a microprocessor, to adjust motor voltage and power, allowing the system to operate in constant-voltage, first variable-voltage, and second variable-voltage modes, thereby altering the rotational speed-torque relationship to increase maximum torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the DC motor operates with maximum torque under constant voltage, then the torque output is maximized, but the torque cannot be further increased and the motor's applicability is limited
Solution Approach 1:
The patent applies dynamics by transitioning from constant voltage operation to variable voltage operation. The microprocessor dynamically adjusts the motor voltage based on operational requirements, allowing the motor to operate at different points on the torque-speed curve. This enables the motor to achieve maximum torque at various speeds and extends its applicable range beyond the fixed constant-voltage limitation.
Solution Approach 2:
The patent changes the voltage parameter from constant to variable. By allowing the motor voltage to change dynamically under microprocessor control, the system can adjust the torque-speed relationship to match different load requirements. This parameter change enables the motor to deliver optimal torque across a broader range of operating conditions, thereby improving applicability.
2Force
If the motor voltage is increased to increase maximum torque, then the torque capability is improved, but the system complexity increases due to variable-voltage control requirements
Solution Approach 1:
The microprocessor serves multiple functions: it controls the variable-voltage operation to increase torque, manages the switching between different voltage modes (first variable-voltage mode and second variable-voltage mode), and optimizes overall motor performance. By consolidating these control functions into a single intelligent controller, the system achieves enhanced torque capability without proportionally increasing overall control complexity.
Solution Approach 2:
The patent replaces traditional mechanical or analog voltage control mechanisms with electronic digital control via a microprocessor. This substitution allows for precise, programmable voltage adjustment and enables complex control strategies (such as switching between different variable-voltage modes) to be implemented through software rather than complex hardware circuits, thereby managing system complexity.
3Power
If the system operates in variable-voltage modes to enhance torque, then the torque-speed relationship is improved, but the control complexity increases due to multiple operating modes
Solution Approach 1:
The microprocessor implements self-service control by automatically selecting and switching between the constant-voltage mode, first variable-voltage mode, and second variable-voltage mode based on real-time motor operating conditions and load requirements. This automated mode selection eliminates the need for manual intervention or complex external control logic, allowing the system to optimize torque-speed performance while maintaining operational simplicity.
Solution Approach 2:
The system employs feedback control where the microprocessor monitors motor performance and adjusts the voltage mode accordingly. By continuously monitoring operational parameters and automatically switching between control modes based on feedback signals, the system maintains optimal torque-speed characteristics without requiring complex external control mechanisms, thereby simplifying operation.
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 enhances the applicability of DC motors by increasing maximum torque and maintaining efficient duty cycles across varying rotational speeds, reducing harmonics and improving overall efficiency.
Implementation Method 1
The switch circuit is electrically connected between the power supply device and the DC motor for receiving the input electrical energy and outputting a motor electrical energy to the DC motor
Implementation Method 2
The microprocessor is electrically connected to the switch circuit for controlling operation of switches in the switch circuit, and the microprocessor and the power supply device are in communication with each other
Data Source
AI summary
The present disclosure provides a DC motor driving system including a DC motor, a power supply device, a switch circuit, and a microprocessor. The power supply device provides an input electrical energy. The switch circuit receives the input electrical energy and outputs a motor electrical energy, which includes a motor power and a motor voltage, to the DC motor. The DC motor driving system switchably works in a constant-voltage mode, a first variable-voltage mode, or a second variable-voltage mode. In the constant-voltage mode, the input electrical energy remains unchanged. In the first variable-voltage mode, the microprocessor controls the power supply device to adjust the input electrical energy for increasing the motor voltage and the motor power. In the second variable-voltage mode, the microprocessor controls the power supply device to adjust the input electrical energy for decreasing the motor voltage and keeping the motor power unchanged.