An example method of initiating operation of a wound field synchronous machine in a motoring mode includes estimating an initial position of a rotor of a wound field synchronous machine using a carrier injection sensorless stimulation signal. The two tubular members are welded together in a longitudinally extending portion to provide support for the mounting structure of a bumper assembly. The issued service ticket is transferable between IC card and equipment, enabling to provide a service having circulation capability to the electronic wallet transaction. The Universal Serial Bus device does not transmit capacity information of the at least one backup partition to the host.