<p>The housing (1) has a housing lower part (2) connected with an electric motor, and a conductor plate arranged in the housing. A housing upper part (3) is fitted on the housing lower part. An opening is provided for a heat sink (7) for an electronic component. The opening is arranged in the housing upper part, where the housing upper part is made of plastic. The housing upper part consists of a front wall (4) and a circumferential side wall (5), and a dome-shaped extension is formed on an inner side of the front wall. The opening is arranged in a front side of the extension.</p>
