A voltage regulator device provided in a bearing of a rotary electric machine of a motor vehicle. The regulator device comprises a support and at least one electronic component configured to participate in the control of the electric machine. The support comprises a first part on which the at least one electronic component is mounted. The first part having an edge equipped with a brush holder provided with at least one brush-holder receptacle configured to accommodate a brush for making an electrical connection with a rotor of the electric machine. The device is configured to allow air to flow through the first part of the support, in contact with the brush holder. The device includes at least one air circulation slot provided through the support between the first part and the brush-holder. The support covers an air opening in the bearing.