Motor Control Circuit Using Single-Voltage Direction and Speed Input
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Solution Overview
Problem
Existing motor control systems require complex configurations to manage both rotation direction and speed, often necessitating separate signal voltages, which complicates the system setup.
Innovation Solution
A control device that uses a single DC voltage input to manage both rotation direction and speed by selectively supplying the voltage to multiple terminals, allowing the PLC to control the motor's direction and speed through a simpler wiring configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate signal voltages are used to control motor rotation direction and speed, then the motor control functionality is achieved, but the system configuration becomes complex with multiple power supplies and wirings
Solution Approach 1:
The patent combines multiple control functions (rotation direction control and speed control) into a single signal voltage system. The host device outputs one signal voltage that serves dual purposes: the polarity controls rotation direction while the magnitude controls speed, eliminating the need for separate power supplies and reducing wiring complexity
Solution Approach 2:
The signal voltage is designed to perform multiple functions simultaneously. A single voltage signal from the host device controls both the direction (through polarity) and speed (through magnitude) of the motor, making the control system more versatile and reducing the number of components needed
2Reliability
If multiple types of power supplies are used for motor drive voltage and signal voltage, then the motor can be controlled effectively, but the host device requires complex power supply management
Solution Approach 1:
The patent merges the power supply requirements by using a single power supply source for both the motor drive voltage and the signal voltage. This eliminates the need for multiple power supplies in the host device, simplifying the power management system while maintaining reliable motor control through proper voltage level design
Data Source
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AI summary
A control device includes first and second input terminals to which a DC voltage for driving a motor is input, and a control unit. The control unit sets a rotation direction of the motor based on first input to the first input terminal or the second input terminal. A rotation speed of the motor is changed based on a subsequence input of the DC voltage.