Hi,
If you use LPC553x to control PMSM or BLDC, for each LPC553x, there are two eFlxPWM modules, two ENC modules(which can decode Encoder signal to get rotor position), two ADC modules, so each LPC553x can control two motors, in other words, the two motors can be two PMSM, two BLDC, or one PMSM and one BLDC.
Hope it can help you
BR
XiangJun Rong