Electric Motor Driving Device Phase Adjustment for Efficiency
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Solution Overview
Problem
Existing driving systems for synchronous electric motors face complexity in circuit configuration and processing when performing torque and speed control, leading to inefficiencies even when these controls are not implemented, as they rely on adjusting drive voltage phases to match induced voltage and current phases directly.
Innovation Solution
A driving device comprising a voltage controller, parameter setter, and phase adjuster that adjusts the phase of the drive voltage based on an index calculated from the current and speed information, such as the ratio of current to output torque, to minimize the phase difference and achieve high efficiency without requiring explicit torque and speed control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If torque control and speed control are performed in the driving system, then the control precision and performance are improved, but the circuit configuration and processing become complicated
Solution Approach 1:
The patent extracts and eliminates the torque control and speed control functions from the driving system, retaining only the essential phase adjustment function. This is achieved by directly adjusting the phase of the drive voltage to match the induced voltage phase, thereby achieving high efficiency without the complex control mechanisms.
Solution Approach 2:
The patent makes the driving system universally applicable by designing it to achieve high efficiency through a single phase adjustment mechanism that works across different operating conditions without requiring specialized torque or speed control circuits, thus simplifying the overall system while maintaining performance.
2Productivity
If torque control and speed control are performed in the driving system, then the motor performance is improved, but the processing complexity increases
Solution Approach 1:
The patent removes the complex torque control and speed control processing from the driving system, keeping only the essential phase adjustment processing. This extraction maintains motor performance by focusing on the critical phase synchronization while eliminating unnecessary processing complexity.
3Loss of energy
If the phase of drive voltage is adjusted to match induced voltage and current phases, then the efficiency of the electric motor is improved, but the control system becomes more complex
Solution Approach 1:
The patent extracts only the essential phase adjustment function from the control system, eliminating the need for complex torque and speed control mechanisms. This allows the system to achieve high motor efficiency through simple phase synchronization without the overhead of a complex control system.
Data Source
AI summary
According to one embodiment, a driving device includes a voltage controller, a parameter setter, and a phase adjuster. The voltage controller causes an electric power converter to apply a drive voltage to the electric motor, the electric power converter converting input electric power to A/C electric power having desired voltage and frequency and supplying the converted electric power to an electric motor. The parameter setter sets at least one of a rotation speed of the electric motor and a parameter related to the rotation speed as speed information. The phase adjuster adjusts a phase of the drive voltage in such a manner that an index calculated based on a current flowing in the electric motor and the speed information set in the parameter setter becomes smaller.