The Renesas Motor Control Kit, YROTATE-IT-RX62T, is based on the RX62T device from the powerful 32-bit
RX microcontroller family.
The kit enables engineers to easily test and evaluate the performance of the RX62T in a laboratory
environment when driving any 3-phase Permanent Magnet Synchronous Motor (e.g. AC Brushless Motor)
using an advanced sensorless Field Oriented Control algorithm. Typical applications for this type of solution
are compressors, air conditioning, fans, air extractors, pumps and industrial drives.
The phase current measurement is done via three shunts which offers a low cost solution, avoiding the
need for an expensive current sensor. A single shunt current reading method is also available.
The powerful user-friendly PC Graphical User Interface (GUI) gives real time access to key motor
performance parameters and provides a unique motor auto-tuning facility.
The hardware is designed for easy access to key system test points and for the ability to hook up to an
RX62T debugger. Although the board is normally powered directly from the USB port of a Host PC,
connectors are provided to utilise external power supplies where required.
The YROTATE-IT-RX62T is an ideal tool to check out all the key performance parameters of your selected
motor, before embarking on a final end application system design.
Target Device:
RX62T/63T Microcontroller Series
UM-YROTATE-IT-RX62T Rev.1.00
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RX62T
YROTATE-IT-RX62T Motor Control Kit
Contents
1. Key features .................................................................................................................................................................. 3
5. LEDs function description ............................................................................................................................................. 8
6. Internal power stage brief description ......................................................................................................................... 9
7. Interface with an external power stage ...................................................................................................................... 10
8. Connection with a 1.5KW external power stage ........................................................................................................ 14
9. Control microcontroller overview ............................................................................................................................... 15
10. Permanent magnets AC Brushless motor model ...................................................................................................... 17
11. Sensorless Field Oriented Control Algorithm............................................................................................................ 22
12. Flux Feedback Gain ................................................................................................................................................... 23
16. Reference system transformations in details ........................................................................................................... 32
18. PC Graphical User Interface ...................................................................................................................................... 34
19. Motor Auto-calibration using the PC GUI ................................................................................................................. 36
20. List of motors tuned automatically using the PC GUI ............................................................................................... 46
21. List of variables used in the file name: “motorcontrol.c” ......................................................................................... 47
UM-YROTATE-IT-RX62T Rev.1.00
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RX62T
YROTATE-IT-RX62T Motor Control Kit
1. Key features
UM-YROTATE-IT-RX62T Rev.1.00
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RX62T
YROTATE-IT-RX62T Motor Control Kit
2. Hardware overview
The Motor Control kit is a single board inverter, based on the new RX series microcontroller RX62T. The hardware
includes a low-voltage MOSFETs power stage, and a communication stage.
The ordering part name of the kit is: YROTATE-IT-RX62T. The latest updates of the kit material are available on the
webpage:
http://tinyurl.com/YROTATE-IT-RX62T
To obtain the maximum flexibility, the reference board includes:
•
•
•
•
A complete 3-phase inverter on-board with a low voltage motor, so it becomes easy to test the powerful
sensorless algorithm on the RX62T
USB communication with the PC via a H8S2212 microcontroller
Connectors for hall sensors and encoder connections
Compatibility with the existing Motor Control Reference Platforms MCRP05/06 power stage available at
Renesas.
To achieve these aims, an independent communication stage was implemented, based on the Renesas
microcontroller H8S2212, which performs the USB to serial conversion.
The two serial lines RX and TX are fully insulated
Signals conditioning
POWER STAGE
STEP-DOWN
STEP_UP
EXTERNAL POWER
STAGE INTERFACE
CONTROL STAGE
HALL, ENCODER
ISOLATION
COMMUNICATION
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RX62T
This stage uses the PC USB power lines as power supply.
YROTATE-IT-RX62T Motor Control Kit
Furthermore, the possibility to supply all the board using the PC USB port was added, realizing a step-up converter to
obtain the inverter V
BUS
necessary for the motor; obviously, if this feature is used, the system is no more insulated
from the PC.
If external power supply is used for the inverter, the logic power supply is obtained through a step-down converter,
in order to reduce heating and power consumption.
Please refer to the electrical drawings or schematics to get the hardware implementation in more details.
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