Sensorless Motor Startup Control via Progressive Energy
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Solution Overview
Problem
Conventional motor-driving circuits often fail to start sensorless motors effectively due to inadequate energy supply and rotational speed regulation.
Innovation Solution
An apparatus comprising a receiver, starter, detector, and electrical controller that acquires a control signal for a predetermined rotational speed, progressively increases energy to the motor, detects the rotor position, and gradually regulates energy to maintain the motor at the desired speed, preventing start-up failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional motor-driving circuit directly regulates the rotational speed of the sensorless motor to be constant, then the rotational speed control is simplified, but the sensorless motor fails to start-up
Solution Approach 1:
The patent applies preliminary action by implementing a start-up phase before constant speed regulation. The controller first determines rotor position and applies appropriate phase currents to initiate rotation, then transitions to constant speed control. This preliminary initialization action resolves the contradiction by ensuring reliable start-up before applying simplified constant speed regulation.
2Speed
If energy is supplied abruptly to the sensorless motor, then the motor can start faster, but the motor fails to start-up due to inadequate energy supply management
Solution Approach 1:
The patent applies dynamics by making the energy supply adaptive rather than static. The controller dynamically adjusts the magnitude and duration of phase currents based on real-time rotor position detection and operational phase (start-up vs. running). This dynamic energy management ensures sufficient power for fast start-up while preventing inadequate energy supply that causes start-up failures.
Solution Approach 2:
The patent implements periodic action through phased control sequences. The motor control is divided into distinct periods: an initialization period for rotor position detection, a start-up period with specific current patterns, and a running period with constant speed control. This periodic structuring ensures proper energy supply at each stage, resolving the start-up reliability issue.
3Stability of the object's composition
If the rotational speed is regulated gradually after start-up, then the motor operates smoothly, but the control process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the control process into distinct functional modules: rotor position detection module, phase current determination module, and speed regulation module. Each module handles a specific aspect of control, making the overall complex process manageable and maintainable while ensuring smooth transitional speed regulation for operational stability.
Data Source
AI summary
An apparatus and a method for driving a sensorless motor are described and shown in the specification and drawings, where the method includes steps as follows. First, a control signal is acquired, where the control signal has information of a predetermined rotational speed. Next, energy is supplied and progressively increased to the sensorless motor, so as to rotate a rotor of the sensorless motor. Then, a position of the rotor is detected. Finally, the energy is gradually regulated so that the sensorless motor is maintained at the predetermined rotational speed.