Synchronous Motor Controller Phase Adjustment for Pulsation Suppression
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Solution Overview
Problem
Existing control technologies for synchronous motors face challenges in suppressing rotational pulsations caused by individual motor variations without increasing the complexity of the control algorithm or the scale of the integrated circuit.
Innovation Solution
A controller is designed to adjust the current control gain, considering the phase property of the disturbance response with respect to the pulsation frequency within ±45°, to suppress torque pulsation components generated by induction voltage distortion and phase variations, without requiring prior knowledge of pulsation waveform information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If waveform deformation or learning function is used to suppress pulsation components, then rotational pulsation is reduced, but device complexity and control algorithm complexity increase greatly
Solution Approach 1:
The patent applies parameter changes by adjusting the phase of the driving voltage waveform relative to the back electromotive force. Specifically, it sets the phase difference to be 90 degrees or more (preferably 90-120 degrees) to suppress pulsation components. This parameter adjustment achieves pulsation reduction without requiring complex learning functions or algorithms, thereby resolving the contradiction between pulsation suppression and control complexity.
2Object-affected harmful factors
If waveform deformation or learning function is used to suppress pulsation components, then rotational pulsation is reduced, but the scale of the integrated circuit increases greatly
Solution Approach 1:
The patent uses parameter changes (phase adjustment of driving voltage) to suppress pulsation, which can be implemented with simple control logic. This approach avoids the need for large-scale integrated circuits required by learning functions or complex observers, thereby reducing the quantity of circuit components while achieving the same pulsation suppression effect.
3Object-affected harmful factors
If sinusoidal current driving is used, then rotational pulsation is suppressed in principle, but pulsation components are still generated due to motor characteristics and manufacturing variations
Solution Approach 1:
The patent applies preliminary anti-action by proactively adjusting the phase of the driving voltage to counteract pulsation components before they occur. By setting the phase difference between driving voltage and back electromotive force to 90 degrees or more, the control system preemptively compensates for pulsation caused by motor characteristics and manufacturing variations, thereby improving reliability of pulsation suppression.
Solution Approach 2:
The patent changes the operating parameters by adjusting the phase relationship between driving voltage and back electromotive force to 90-120 degrees. This parameter modification addresses pulsation issues arising from motor characteristics and manufacturing variations without requiring complex adaptive control, thereby maintaining reliable pulsation suppression.
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
This approach effectively minimizes rotational pulsations by adjusting current control gain based on frequency information alone, simplifying the control configuration and reducing the need for complex algorithms, thereby achieving efficient suppression of pulsation components.
Implementation Method 1
an inverter (3) for applying a voltage with modulated pulse width to the synchronous motor (5) and driving the same with an alternating current; a controller (2) for calculating an applied voltage to the motor (5) and generating a pulse-width modulated wave (PWM) signal for the inverter (3)... by adjusting the phase property of disturbance response with respect to the pulsation frequency within ±45°
Data Source
AI summary
A control technology for a synchronous motor for suppressing rotational pulsation caused by variation in individuals without making a control algorithm complex is provided. In a motor drive system which is a control device for a synchronous motor, in order to suppress the pulsation component of N times as high as the AC frequency for driving the synchronous motor, a controller in which the phase property of the disturbance response of the controller with respect to the pulsation frequency is within ±45° is arranged. Therefore, the torque pulsation component generated from distortion in induction voltage or variation between phases is suppressed.