Title :
Accurate torque control of saturated interior permanent magnet synchronous motors in the field-weakening region
Author :
Bech, Michael M. ; Frederiksen, Torben S. ; Sandholdt, Per
Author_Institution :
Inst. of Energy Technol., Aalborg Univ., Denmark
Abstract :
This paper focuses on accurate torque control of saturated interior permanent magnet (IPM) synchronous motors operating in the field-weakening region, where the maximum torque per ampere strategy cannot be used. First, a simple-but yet accurate-torque calculation method that takes saturation effects into account is devised: the torque developed at an arbitrary (id, iq) may be calculated using only six parameters, which makes the method well suited for DSP implementation. Next, a field-weakening strategy is suggested, which incorporates the new torque calculation method. In this way the torque is controlled accurately deep into the field-weakening region, where voltage and current limitations impose constraints on the allowable (id,iq) excitation. Experimental results on a 15 kW low-voltage IPM motor are included to validate the practical usefulness of the work.
Keywords :
digital signal processing chips; machine control; permanent magnet motors; synchronous motors; torque control; 15 kW; DSP implementation; PMSM; digital signal processing; field-weakening region; permanent magnet synchronous motors; torque control; Digital signal processing; Inverters; Magnetic flux; Permanent magnet machines; Permanent magnet motors; Permanent magnets; Saturation magnetization; Synchronous motors; Torque control; Voltage control;
Conference_Titel :
Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005
Print_ISBN :
0-7803-9208-6
DOI :
10.1109/IAS.2005.1518815