| Abstract |
A control scheme based on direct torque control (DTC) with maximum torque per ampere (MTPA)
characteristics for interior permanent magnet synchronous motors (IPMSM) is proposed. The scheme
uses the reluctance torque effectively to obtain faster torque response.
IPMSM has a saliency. In other words, the q-axis inductance in the IPMSM is larger than the d-axis
inductance. This saliency introduces the reluctance torque. MTPA control has been proposed as a
scheme of using this reluctance torque effectively. In the DTC, the MTPA control is achieved by
setting a torque reference and a stator flux-linkage reference appropriately. However, a torque
response may get worse when the DTC with the MTPA characteristics applied to IPMSM without
considerations of the influence of the transient reluctance torque.
In the proposed scheme, the impairment of the torque response caused by the reluctance torque is
reduced by delaying the input of a stator flux-linkage reference to the input of a torque reference into
the controller at a start. The starting torque response and the stator flux-linkage trajectory of the
proposed scheme are compared with those of a conventional scheme in simulations and experiments.
The effectiveness of the proposed scheme is verified through simulations and experiments. |
