Electric Drive Phase-Winding Noise Compensation for EMI Control
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Solution Overview
Problem
Electric drive units in vehicles experience undesired signal effects and electromagnetic interferences, particularly at high speeds or accelerations, which impair the driving experience and signal integrity.
Innovation Solution
A method that involves dividing the phase windings of the electric machine into two sub-sets, where one sub-set is used for rotating the rotor and the other sub-set is used for noise compensation, with the noise compensation signals being tailored to eliminate or attenuate undesired signal effects such as high-frequency spikes, by either using zero current or voltage or specific compensation signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the inverter is operated at high switching frequencies to improve control precision and response speed, then the control precision and response speed are improved, but undesired signal effects and electromagnetic interferences increase
Solution Approach 1:
The patent applies noise compensation measures that generate compensation signals specifically designed to counteract the undesired signal effects produced by high-frequency switching. The compensation signals are tailored to eliminate or attenuate the harmful electromagnetic interferences while preserving the beneficial high-frequency operation for improved control precision.
Solution Approach 2:
The control device predicts undesired signal effects before they occur and generates compensation signals in advance. By using prediction algorithms to anticipate the timing and characteristics of switching-induced noise, the system prepares compensatory actions that neutralize the harmful effects before they manifest, allowing high-frequency operation without the associated interference problems.
2Speed
If the inverter is operated at high switching frequencies to improve response speed, then the response speed is improved, but electromagnetic interferences increase
Solution Approach 1:
The patent transforms the harmful electromagnetic interferences generated by high-frequency switching into beneficial effects by using noise compensation measures. The compensation signals are specifically tailored to counteract the interference while preserving the fast response characteristics, effectively converting the harmful high-frequency noise into a useful control mechanism.
Solution Approach 2:
The control device introduces compensation signals as an intermediary element between the inverter switching and the electric machine. These compensation signals act as a mediator that cancels out the electromagnetic interferences produced by high-frequency operation, allowing the system to maintain fast response speeds without the associated interference problems.
3Power
If all phase windings are used for rotor rotation to maximize power output, then the power output is maximized, but noise compensation capability is reduced
Solution Approach 1:
The patent makes the phase windings multi-functional by enabling them to serve dual purposes: driving the rotor rotation and providing noise compensation. The control device selectively applies compensation measures to specific phase windings, allowing the same windings to contribute to both power generation and interference reduction, thereby eliminating the need to sacrifice power output for noise compensation.
Solution Approach 2:
The patent merges the functions of power generation and noise compensation into a unified control strategy. By combining the drive signals and compensation signals in the phase windings, the system achieves both maximum power output and effective noise reduction simultaneously, rather than requiring separate dedicated windings for each function.
4Reliability
If noise compensation measures are applied to reduce undesired signal effects, then the signal integrity is improved, but the device complexity increases
Solution Approach 1:
The control device uses its own computational resources and existing control infrastructure to generate compensation signals, rather than requiring external dedicated hardware. The system self-services by using its built-in processing capability to predict and counteract noise, thereby improving signal integrity without proportionally increasing overall device complexity.
Solution Approach 2:
The patent implements noise compensation by changing control parameters (compensation signal amplitudes, frequencies, and phases) rather than adding complex hardware structures. This parameter-based approach allows the system to achieve improved signal integrity through software-controlled adjustments to existing components, minimizing the increase in device complexity.
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 reduces or eliminates undesired signal effects and electromagnetic interferences, improving the driving experience and signal integrity, even under full load conditions, by optimizing the operation of the electric machine and reducing noise impact on electronic components.
Implementation Method 1
The inverter is used for transforming a direct current (DC) being provided by a battery unit into an alternating current (AC) which is fed to the electric machine
Implementation Method 2
triggering an AC drive signal for each phase winding of a first sub-set of phase windings such that the rotor is rotated via the phase windings of the first sub-set
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The disclosure relates to a method for operating an electric drive unit (10). The electric drive unit (10) comprises an electric machine (12) with a stator (14) and a rotor (16). The stator (14) comprises a set of phase windings. Moreover, the electric drive unit (10) comprises an inverter (18) for controlling the operation of the electric machine (12) by providing AC signals to the phase windings. The inverter (18) is electrically coupled to the phase windings. The method comprises triggering an AC drive signal for each phase winding of a first sub-set of phase windings such that the rotor (16) is rotated via the phase windings of the first sub-set. Additionally, the method comprises triggering a noise compensation measure for at least one phase winding of a second sub-set of the phase windings for compensating an undesired signal effect. Moreover, a data processing device (20) and an electric drive unit (10) with such a data processing device (20) are presented.