Permanent magnet synchronous motor is a popular choice for electric vehicle application because of high power density, fast dynamic response and high efficiency. In case of Surface Mounted Permanent Magnet Synchronous Motor (SPMSM), d and q axis inductance are equal and there exists only electromagnetic torque. However, in case of Interior Permanent Magnet Synchronous Motor (IPMSM), unlike conventional salient pole synchronous motor, q-axis inductance is greater than d-axis inductance and it will result in reluctance torque in addition to electromagnetic torque. For an EV motor, it is expected to have wide speed range to avoid the gear mechanism and to reduce the motor size. With the availability of reluctance torque in the field weakening region, IPMSM is better suited for EV application. When there exists reluctance torque additionally, the relation between the torque current is no longer linear and controller design becomes complex. In this paper, a control scheme is presented to realize maximum torque per ampere in the entire speed range, which results in linear relation between the torque and current. The control scheme is investigated with analytical analysis and experimental results.