System architecture

UM1491

6/25

Doc ID 022479 Rev 1

2

System architecture

A generic motor control system can be schematized as the arrangement of four main blocks

(

Figure 2).

●

Control block: its main tasks are to accept user command and motor drive configuration

parameters, and to provide digital signals to implement the appropriate motor driving

strategy

●

Power block: it performs the power conversion from the DC bus, transferring it to the

motor by means of a 3-phase inverter topology

●

The motor: the STEVAL-IHM021V2 board can drive any PMSM, but the FOC itself is

conceived for sinusoidal-shaped back-EMF

●

Power supply block: it can accept input voltages of 86 to 260 Vac and provides the

appropriate levels to supply both the control block and power block devices

Figure 2.

Motor control system architecture

Of the above motor control system architecture, the STEVAL-IHM021V2 includes the Power

Supply and Power hardware blocks.

The power block, based on the high voltage gate driver L6390 and power MOSFET

STD5N52U, converts the signals coming from the control block into power signals capable

of correctly driving the 3-phase inverter, and therefore the motor.

The power supply can be fed with 110 or 230 Vac mains, and the maximum allowed input

power is 100 W at 230 Vac (refer to

Section 7).

In the control block, a J3 connector is mounted on both the STEVAL-IHM021V2 and the

STM3210B-EVAL, which allows the STM32 microcontroller demonstration board to be used

as a hardware platform for development. Minor modifications may be applied to the “STM32

FOC firmware libraries v2.0” for these to be used as a software platform for the sensorless

control of PMSMs (see

Section 9.4).