Rotary Electric Machine Torque Control Vibration Suppression
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Solution Overview
Problem
The existing control systems for rotary electric machines face limitations in output torque due to magnetic saturation, leading to decreased average output torque when the machine approaches its maximum output, resulting in reduced vehicle acceleration.
Innovation Solution
A control apparatus that calculates a final torque command value by adding a vibration torque command value to a basic torque command value, with an amplitude addition presence/absence determination block that limits the vibration torque to prevent exceeding the maximum output torque, thereby maintaining the average output torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the rotary electric machine is made to output vibration torque to cancel torque vibration, then torque vibration is reduced, but the average output torque decreases when approaching maximum output torque
Solution Approach 1:
The control apparatus dynamically adjusts the vibration torque command value based on the basic torque command value. When the basic torque command value is high (near maximum output), the vibration torque amplitude is reduced or eliminated to prevent the average torque from dropping below the maximum output torque. This dynamic adjustment resolves the contradiction by adapting the vibration cancellation strategy to the current operating point.
Solution Approach 2:
The system changes the parameter of vibration torque amplitude based on the basic torque command value. By modifying the amplitude parameter of the vibration torque according to the operating conditions, the system achieves effective vibration cancellation at low to medium torque levels while maintaining maximum output torque capability at high torque levels, thus resolving the contradiction between vibration reduction and power output.
2Ease of operation
If the upper limit of vibration torque is not limited, then the rotary electric machine can output the vibration torque, but the ridge portion of vibration torque component exceeds maximum output torque
Solution Approach 1:
The control apparatus uses feedback control by continuously comparing the sum of basic torque command value and vibration torque command value against the maximum output torque. When the sum exceeds the maximum output torque, the vibration torque command value is adjusted downward. This feedback mechanism ensures the vibration torque can be output when needed while preventing exceedance of the maximum output torque limit, resolving the contradiction between operational ease and reliability.
Data Source
AI summary
A control apparatus of a rotary electric machine which can be configured so that the upper limit of a vibration torque component, in which the rotary electric machine is made to output, is not limited by a maximum output torque of the rotary electric machine is provided. The rotary electric machine is controlled such that when a vibration maximum value in which an amplitude of a vibration torque command value Tcv from a vibration command calculation section is added to a basic torque command value Tcb from a basic torque command calculation section exceeds an upper limit command value Tcmx, the addition of the vibration torque command value Tcv from the vibration command calculation section is stopped and a basic vibration torque command value Tcvb calculated by a basic vibration torque calculation block is regarded as a final torque command value Tcf.