Abstract
Switched Reluctance Machines (SRM) are considered promising rare-earth free candidates for the next generation electrified vehicles. One of the main drawback of this technology is the need of a large DC-link capacitor to balance the energy transferred back and forth between the DC source and the SRM. There are interesting novel modulations to reduce the current of the DC bus, focused on the capacitor size and cost reduction but leaving aside the thermal analysis and lifetime improvements. Carrying out the required dynamic multi-physics simulations for that purpose becomes highly time consuming and complex, especially when standardized or real driving conditions are needed to be taken into account. This article proposes a simulation methodology, simple to implement and with a relatively low computational cost, to estimate the lifetime of an automotive DC-link capacitor, with the current load it delivers as the starting point. The presented methodology has also been used to validate a novel SRM modulation technique and to compare it, in terms of reliability, with the conventional torque sharing function.
Highlights
T HE Electric Vehicle (EV) and the Hybrid Electric Vehicle (HEV) are attracting close attention of consumers, policymakers and the automotive sector in response to the growing concern and societal awareness over the global warming of our planet and the need to protect the environment.The electric machine of an EV is one of its most relevant components
Among the existing rare-earth free electric machine technologies, the Switched Reluctance Machines (SRMs) are considered promising candidates for the generation electrified vehicles [7]–[9], due to their flexibility of control, high efficiency, simple structure, low cost and robustness to run under failure conditions [10]–[12]
This novel modulation is built ‘on top of’ a Torque Sharing Function (TSF), and both are implemented into an Indirect Torque Control (ITC)
Summary
T HE Electric Vehicle (EV) and the Hybrid Electric Vehicle (HEV) are attracting close attention of consumers, policymakers and the automotive sector in response to the growing concern and societal awareness over the global warming of our planet and the need to protect the environment. [32] validates a lifetime model for different capacitor technologies (widely used by industry), which uses the two main stressors to capacitor wear out: the hot-spot temperature and the operational voltage This model is applied within an interesting damage model for a statistical lifetime prediction in an adjustable speed drive [25], a wind power converter [33] and a metro traction drive system [34]. Of a capacitor-pack set into a power converter, starting from the current load that a DC-link delivers into a dynamic load condition This methodology simplifies the electrothermal simulations taking advantage from the large thermal-inertia that capacitors have, making it simple to implement and with a relatively low computational cost.
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