Motor Voltage Phase Control for Low-Complexity Torque Efficiency
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Solution Overview
Problem
Existing motor control methods struggle to maximize efficiency and torque while minimizing current consumption, particularly in synchronous motors with interior permanent magnets, due to complex calculations involving square roots and divisions, which are difficult to implement with low-processing-performance ICs.
Innovation Solution
A driving device and control method that adjusts the phase of the driving voltage based on the relationship between motor current and rotational position, using a combination of first and second phase control processes to align the current phase with electromotive force, and adjusts the phase to minimize an efficiency index, utilizing a power converter, voltage controller, and phase adjuster to optimize torque and current efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If complex calculations involving square roots and divisions are used to optimize motor efficiency, then motor efficiency and torque are maximized, but implementation becomes difficult with low-processing-performance ICs
Solution Approach 1:
The patent transforms the control approach by changing the parameter being controlled from direct current magnitude to voltage phase angle. Instead of calculating optimal current values using complex square root and division operations, the system adjusts the phase angle of the driving voltage to align with the electromotive force, achieving efficiency optimization through simpler phase-angle-based control that is computationally feasible for low-performance ICs
Solution Approach 2:
The patent replaces complex mathematical computation (mechanical/system of calculations) with a phase alignment control mechanism. By substituting the computational system with a phase-synchronization approach, the system achieves the same efficiency optimization goal without requiring high-processing-performance hardware, thus resolving the contradiction between efficiency maximization and implementation complexity
2Use of energy by moving object
If voltage phase is adjusted to align current phase with electromotive force, then motor efficiency is enhanced, but control complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the relationship between current phase and electromotive force phase, then adjusts the driving voltage phase accordingly. This closed-loop feedback control enables automatic phase alignment to maximize efficiency while using simple computational operations suitable for low-performance ICs, balancing efficiency enhancement with manageable control complexity
3Power
If multiple phase control processes are used to optimize torque and current efficiency, then motor performance is maximized, but processing requirements increase
Solution Approach 1:
The patent divides the phase control process into two distinct segments: a first phase control process that receives information about the relationship between current phase and rotational position, and a second phase control process that receives information about current magnitude and rotational speed. This segmentation allows each process to use simplified calculations appropriate for low-performance ICs while collectively achieving optimal torque and current efficiency through coordinated operation of the two control processes
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 method achieves high efficiency and responsive motor operation by aligning current phase with electromotive force, effectively maximizing torque and minimizing current consumption, even in interior permanent magnet-type motors, using low-processing-performance ICs.
Implementation Method 1
a power converter (1), a rotor position detector (5), a current detector (6), a rotational speed arithmetic unit (7), a voltage controller (8), and a phase adjuster (9)... the power converter (1) converts input power into an AC power, and supplies the AC power to the motor (4)
Implementation Method 2
a synchronous motor (4)... a method in which a voltage phase is adjusted such that a phase of an electromotive force (EMF) (or back-EMF, induced voltage) and a current phase of a motor coincide
Data Source
AI summary
According to one embodiment, a driving device includes a power converter, a voltage controller and a phase adjuster. The phase adjuster is configured to execute a first phase control process of receiving first information relating to a relationship between a phase of a motor current flowing through the motor and a rotational position of the motor, and adjusting the phase of the driving voltage, based on the first information. The phase adjuster is configured to execute a second phase control process of receiving second information relating to a magnitude of the motor current and third information relating to a rotational speed of the motor, and adjusting the phase of the driving voltage, based on the second information and the third information.