Mahle has been granted a patent for an electrical machine for vehicles. The machine includes a rotor, stator, coolant distributor chamber, and coolant collector chamber. The stator windings are embedded in an electrically insulating plastic compound for thermal coupling to the coolant. The coolant chambers are partially arranged in the plastic compound. The machine also features a fixing device for securing the cooling ducts. GlobalData’s report on Mahle gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Mahle, Battery management systems was a key innovation area identified from patents. Mahle's grant share as of September 2023 was 39%. Grant share is based on the ratio of number of grants to total number of patents.

Patent granted for an electrical machine with embedded stator windings

Source: United States Patent and Trademark Office (USPTO). Credit: Mahle GmbH

A recently granted patent (Publication Number: US11777352B2) describes an electrical machine with improved cooling capabilities. The machine includes a rotor that can rotate about an axis of rotation and a stator with stator windings. The machine also features a coolant distributor chamber and a coolant collector chamber, which are connected by at least one cooling duct for the flow of coolant.

One of the key innovations of this patent is the embedding of at least one of the stator windings into a plastic compound made of an electrically insulating plastic. This allows for thermal coupling between the stator windings and the coolant. Additionally, either the coolant distributor chamber or the coolant collector chamber, or both, are partially arranged in the plastic compound to enhance the thermal coupling.

The plastic compound surrounds and insulates the first and second end sections of the stator windings, preventing electrical contact with the coolant. The stator teeth, which extend along the axial direction and are spaced apart from each other along the circumferential direction, define an intermediate space. The plastic compound, along with the cooling duct, is arranged in this intermediate space between two adjacent stator teeth. A fixing device, consisting of protrusions on the stator teeth, secures the cooling duct in place.

The patent also mentions various additional features, such as the use of a thermoset or thermoplastic material for the electrically insulating plastic, the inclusion of multiple cooling ducts, and the arrangement of the coolant chambers in the axial extension of the stator.

This patented electrical machine design has potential applications in various industries, including the automotive sector. The improved cooling capabilities can enhance the performance and efficiency of the machine, making it suitable for use in electric vehicles and other applications where effective cooling is crucial.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.