ST STEVAL-IHM017V1, User Manual

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UM0522 System architecture
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2 System architecture
A generic motor control system can be basically schematized as the arrangement of four
main blocks (see
Figure 2 ):
● A control block whose main tasks are to accept user command and motor drive
configuration parameters and to provide digital signals to implement the proper motor
driving strategy
●
A power block that makes a power conversion from DC bus transferring it into the motor
by means of a three-phase inverter topology
● The motor itself. The STEVAL-IHM017V1 board is able to drive a three-phase
brushless motor with permanent magnet rotor exploiting trapezoidal sensorless control.
●
The power supply block is able to accept 230 Vac input voltage and provide the proper
levels to supply both the control block and power block devices.
Figure 2. Motor control system architecture
The system proposed by STEVAL-IHM017V1 includes all the above hardware blocks (apart
the motor) plus a software GUI that allows configuring the motor drive. Moreover, an open
source C code is available, derived from the ST7MC motor control libraries, allowing easy
customization and extension of control algorithms. The core of the control block is
constituted of an ST7MC MCU that provides the driving signals to the power block according
to a driving strategy, the latter one closely related to the motor type and characteristics.
Driving signals are constituted of 3 complementary PWM signals (in the range of 0-5 V) for
providing logic inputs for high/low side gate driver belonging to the power block. In the
system proposed, three legs are present (3-phase inverter). The power block, based on the
gate drivers L6386 and Power MOSFET (STD5NK52ZD-1), converts the control signals
from ST7MC MCU to power signals for the three phase inverter in order to drive the motor.
The board can be supplied by an AC power supply of 230Vac with a maximum input power
of 100 W. Please refer to
Section 7: Board architecture on page 14 for more details on
system architecture.
With the included Power MOSFET device STD5NK52ZD-1, the maximum rating of rectified
voltage is 520 V and the maximum continuous current is 4.4 A at 25°C.
Control
B lock
P ow er
B lock
P ow er
Supply
M otor
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