1. December 2016, Vincent Mignard
SPIN IT IN A MINUTE
December 2016, Vincent Mignard
WAIT 3 SECONDS BEFORE STARTING – PAUSE.
1. Hello Ladies & Gentleman, thanks for joining us today at Electronica, on the Renesas Booth.
My name is Vincent Mignard, responsible for inverter and motor control solutions within Renesas.
2. For any project leader today , any designer and electronics engineers meeting their deadlines is a priority.
It’s becoming year after year very tough. Especially when they need to integrate new functionalities in their equipment.
Motor Control technology is one example which requires strong expertise in hardware designs, in PCB layout, in software controls and sensorless algorithms. That’s why, Renesas is addressing such concerns with the RX23T/RX24T MCU families.
3. The purpose of my talk is to show you how to overcome the main challenges related to inverter design: each motor has specific features: max speed, torque at low speed… high current or high voltage, … which are linked to each application. You will see how Renesas designed kits to solve such issues and how it enables you to speed-up your designs, at lower costs.
4. I divided my presentation into 3 parts: a) Which are the key challenges to overcome? B) Which MCU and solutions is Renesas offering c) Which collateral will help you to spare time & money.

2. RX Family reach the highest noise immunity5 1 2 3 4
Below Average Average Excellent
Expert Rating: 5
Electro-magnetic tests done on RX23T and RX24T
“The MCU reached the test limits without being disturbed.”
First of all, the first challenge is the equipment robustness against external noise. that 5V MCU offers the highest immunity ever after each pin test.
Key benefits for the designer: robust 1st PCB, no re-spin to do, meet deadlines, cheaper BoM, as no external protection circuit needed.

3. VDE certified IEC60730 Self-Test software
ALU/CPU checks
RAM March C & X tests
Flash tests using CRC
Clock Check
A/D Converter check
Complete VDE s/w certified IEC60730 for 3-phase inverter available !
Second challenges is the safety compliance: IEC either for Sil2, Sil3 or the IEC60730.
Key benefits: we did the job for you, so you spare up to EUR 20K and 4 months of s/w design, test and certification costs.
The software package is delivered as source code and free of charge.

4. RX MCU today are in MP in noisy environments…
Induction cooking
Generators digital regulated
e-bus inverter
Dishwasher inverter
Finally the 3rd key challenges that are facing engineers is to use robust MCU which are already in MP and used in existing products.
The 4 examples here are showing you high switching frequencies, high voltages , high currents and dual motor control boards.
All PCBs are ran with RX MCU and Renesas Software.

5. MCU line-up driving up to 3 motors + Active PFC
In Mass production
MCU line-up driving up to 3 motors + Active PFC
Under Development
RX24T
32-bit, FPU, 5V
100pin-144pin
Flash: KB
8KB Data flash
4 x Diff. PGA, CAN
Performance
32-bit, FPU, 5V
80pin-100pin
Flash: KB
8KB Data flash
4 x PGA
RX24T
RX24T
32-bit, FPU, 5V
64pin
Flash: KB
8KB Data flash
4 x PGA
80MHz
160 DMIPS
RX23T
32-bit, FPU, 5V
48pin-64pin
Flash: KB
40MHz
80 DMIPS
Let’s move on to the second part, the Microcontroller families: 23-bit MCU, 5V, on-chip FPU , even on the smaller version of 48-pin.
Common features: IEC60730 safety features.
High integrated MCU.
FY15
FY16
FY17

6. single MCU driving 2 x motors simultaneously
Drain
Brushless AC
e.g. PMAC T0 T1 T2 T3 T4 T5
600V IPM
Single/Three
shunt
Fault
I/O
DATA
FLASH
MTU3
DOC
RAM Testing
RX24T
POE
12-bit
A/D & PGA
LVD
POR
RX v2 Core
Floating Point Unit
CAC - Clock
monitoring
Fault
Circulation Pump
Brushless AC
e.g. PMAC T0 T1 T2 T3 T4 T5
Single/three
shunt
600V IPM
MTU3
Memory Protection Unit
CODE Flash
Let’s have a look at a specific example where two motors are used.
The RX24T running at 80MHz is able to drive two motors using sensorless vector control algorithm and manage the Power factor correction.
ECC
I/O Check
IWDT
POE
12-bit
A/D & PGA
SPI
A/D
Self-diagnosis

7. What brings the RX 32-bit Floating Point Unit?
Code reduction and faster implementations: no scaling or saturation
Higher accuracy, as the real-life units are used
Faster computation time for PI controller, estimators…
Floating Point Unit
General Registers
32-bit Single-Precision
IEEE-754 compliant
In the context of inverter, the FPU enables:
Code reduction, and much more simple to read & develop, faster implementations
More accuracy, as the real-life units are used
Faster computation time.
=> Float is a way to represent real number on a Microcontroller

8. What about the s/w implementation on RX?
FPU
Each variables are used in real units: volt, hertz, henry, ampere, weber
Motor models can be easily worked out without scaling efforts on each value…
Higher variables resolution
Easy to develop / maintain
FPU
Each variable needs to be normalized…

9. Blocks of the Royalty-Free Software using FPU
Sensorless drive at low-speed
Dead-time compensation
Position control/torque control/ speed control
Auto-tuning
Stator resistance compensation
Parameters self-identification
Bus Voltage automatic compensation
Current PI automatic calibration
Vector Control
Algorithm
PI control
Current & Speed
Modulation
Space Vector
Clamped
Anti-windup
Centred
Current control
Max. torque control
Flux weakening control
Max. efficiency control
Power factor control
Direct Current
control
Let’s move to the second point: the Solutions benefits and details.
Sensorless estimation
Method using
Integral estimation
Model using
Direct Integration
αβ conversion
dq conversion
Decoupling control
Salient pole
Non-salient pole
Position detection
Speed detection

10. Sensorless Algorithm: Fast time response & Dynamics
CPU
USAGE
35%
LOW CPU LOAD
FLASH
USAGE
20KB
RAM
2KB
SMALL MEMORY FOOTPRINT
RX23T
40MHz
80 DMIPS with FPU
Based on the RX23T, a complete inverter kit is available, we spent effort to design a very open and flexible one.
The software is royalty free.
Full sensorless vector control algorithm ready for Mass Production,
Timing given with debug functionalities turned OFF and tuning capabilities turned OFF

11. Enhanced Auto-tuning s/w enable driving of unknown motors in a few minutes
Current PI coefficients tuned !
Stator resistance, synchronous inductance, permanent magnet flux tuned !
Oscilloscope to display
Motor Phase and current
Partname: YROTATE-IT-RX23T
Key benefits: no expensive tools or oscilloscope is needed, after a fey clicks the motor is spinning.

12. HIGH SCALABLE and compatible power stages
Compatible to any Renesas Inverter kits designed over the last 10 years:
From low voltage, low current
Up to high voltage, high current
From low to high speeds motors
60VDC
120APeak
300VDC
20APeak
48VDC
6APeak
Let’s move now to the final part: the collaterals.
=> Such existing hardware enable you to address any type of motors, so you will spare time and efforts for a first running prototype.

13. Up to 80 motors quickly tuned thanks to the Auto-tuning and Self-Calibration
Rated
current
40A
10A 7A
6.5A 5A
3.5A
PROVEN software! 3A
2.2A 2A
1.8A 1A
Bus
Voltage 8V
15V
24V
36V
42V 44V
300V

14. Latest development: RX24T Dual motor control Kit
Two Motors Control & Active PFC
YROTATE-IT-RX24T-2MC-PFC
32-bit 80MHz / 160 DMIPs
5V MCU, Floating Point Unit
Comparators, Op-Amp, safety shutdown, outstanding noise immunity
Inverter kits: royalty-free vector control software, sensorless,
Auto-tuning by default, Low footprint, highly proven software reliability

15. New Collaterals, Tutorials dedicated to engineers
Video link:

16. Spin it in a minute Highest noise immunity
Single/dual inverter kits available
Auto-tuning software enable by default
Large Scalable power stages offer
FPU ensures fast sensorless control
Royalty free embedded Software
VDE Certified Self-test SW
Thanks for your time, now you deserve a kit !
Visit us at

17. Thanks a lot for your attention | vincent.mignard@renesas.com