what if you integrate proven firmware in your inverter?
DESCRIPTION
Nowadays, designing a new 3-phase inverter or integrating an inverter in an existing equipment to drive an AC Permanent Magnet Motor, seems to be an easy task. But it is not. Each motor is very different, in terms of speed range, torque range, voltage and current ranges, weights, sizes, etc. It means their intrinsic parameters like resistance, inductance, flux permanent magnet are extremely different from one motor to another. That’s why, Renesas is now releasing the RX111 inverter kit called YROTATE-IT-RX111 is able to drive very different motors as shown on the picture. This kit provides the dynamics required to drive motors with a high level of accuracy. Renesas has developed the design tools based on RX111 MCUs to respond to a challenge encountered by engineers: tuning the embedded software to the application requirements, especially for sensorless field oriented control algorithms. The inverter kits provide: • Auto-tuning of the current proportional-integral (PI) coefficients: Kp, Ki • Automatic identification of intrinsic motor parameters: Rs, Ls, Λm • Flexible tuning of the control loop and PWM frequencies • Real-time visualization of the motor phase, current and step response • Generation of header file to be integrated in any s/w project They also feature a sensorless vector control algorithm, used to accurately control the speed and the torque. Additionally, the algorithm provide the flux weakening mechanism to achieve rotation speeds higher than the nominal speed of the motor. Each kit contains the YROTATE-IT inverter board, a 24VDC permanent magnet AC motor, a CD-ROM including the embedded software source code, the PC GUI, the board schematics, the bill of materials, Gerber files, user manual, quick start guide and the power stage schematics/Gerber files. www. renesas.eu/motorTRANSCRIPT
Vincent MignardSegment [email protected] October 2014
Renesas Electronics Europe
00000-A
Rev. 1.00
What if you could integrate proven software in your inverter?
2
2KW inverter
3-phase Brushless Motor
Designing electronics to drive submarine motors…
Marine battery
3
… but too many restrictions in the “off the shelf” inverter
Driving in trapezoidalgenerate torque ripple,
electrical & audible noise
No efficient energy management, PWM
frequency fixed…
Minimum speed is fixed and too high. Only clock-wise
rotation…
No software control, ownership and overall cost
too high
4
What is the desired solution?
Flexible speed range Counter-clock-wise rotation Higher efficiency Cost & weight reduction Energy management Silent operation In-house software expertise
5
Guess what… I found a possible solution
Field Oriented Control Sensorless algorithm Auto-calibration Motor self-identification 24VDC / 7Amax
6
But what about the source code access and its reliability?
Royalty free source code Proven over 60 motors
7
Med
Efficiency
Low High
Med
Dynamics
Low High
Example
How to ensure the best trade-off: efficiency versus dynamics?
Test & find the rightPWM frequency &
control loop frequency for your application.
8
How to quickly test an unknown motor?
Current controllerCoefficients tuning
Identify intrinsic Motor parameters
Display motor current
Display motor phase
9
Let’s recap… the benefits of using RX111 ref. platform?
Ensure longer battery lifetime as current consumption is optimized
Smoother control of the submarine: start and direction control
Smaller power stage and less weight
Expertise in-house as proven s/w royalty-free and auto-calibration available
10
“We are family”
11
YROTATE-IT-RX111
Drive your Permanent Magnet Motors in less than 1 minute using mouse Use proven software featuring Vector control sensorless algorithm Discover the Royalty Free Software source code, no E1 needed Ref. kit are well-proven as over 60 Motors were tuned, no Oscillo used Kit capability: 24/48VDC , 7AMAX
1.5KW/300VDC ext. power stage available
Latest update on www.Renesas.eu/motor
12
To experiment by yourself:Evaluate the kits !
Part-name: YROTATE-IT-RX111Price: Below €200
13