Motor Control Circuit Using Two-Terminal DC Input Signals
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Solution Overview
Problem
Existing motor control systems require complex configurations due to the need for separate power supplies and wirings for motor drive voltage and signal voltage, which complicates control of rotation direction and speed.
Innovation Solution
A control device with two input terminals for DC voltage and a control unit that sets the motor's rotation direction and speed by confirming input voltage at these terminals, allowing for simple system configuration by using a single power supply and reducing the number of necessary wirings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate power supplies and wirings are used for motor drive voltage and signal voltage, then motor control functionality is achieved, but system configuration becomes complex
Solution Approach 1:
The patent merges the motor drive voltage and signal voltage into a single power supply system. The control device uses one power supply to provide both the drive voltage for motor operation and the signal voltage for control functions, eliminating the need for separate power supplies and reducing wiring complexity while maintaining full motor control functionality including rotation direction and speed control
Solution Approach 2:
The single power supply in the invention serves multiple functions simultaneously: it provides drive voltage to the motor, provides signal voltage to the control circuit, and enables both rotation direction control and speed control through the same power supply connections. This multi-functionality resolves the contradiction by making the power supply system adaptable to multiple control requirements without increasing complexity
2Adaptability or versatility
If separate signal voltage is used for rotation speed control, then speed control is achieved, but system configuration becomes complex
Solution Approach 1:
The patent combines rotation direction control and rotation speed control into a unified control scheme that uses the same single power supply and control terminals. Both control functions are achieved through the same signal voltage connections, eliminating the need for separate signal wiring and reducing overall system complexity while maintaining full adaptability for both control operations
Data Source
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.