A new class of electric machines is proposed in this paper, which is developed from the DC excited reluctance machine with variable flux. The improvement is that field winding and armature winding are integrated in the proposed design, which can simplify the winding structure and eliminate the external DC power supply. The integrated winding is applied with original sinusoidal current plus DC bias component. The function of AC sinusoidal current is to generate rotating magnetic field, and the excitation field is provided by the stationary DC bias current. By changing the value of DC bias current, we can adjust the allocation of DC bias and armature current flexibly, and improve the torque performance during flux weakening operation. The rotor is mechanically robust because it only has salient poles, and can modulate the air-gap flux because of the different permeance of air and iron pole. Therefore, the magnetic fields produced by the armature current and the DC bias can be coupled effectively to generate electromagnetic torque. The electromagnetic performance of this machine is systematically investigated through finite element analysis. Comparative study is conducted between the proposed DC bias excited machine and its variable flux machine counterpart.