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RL78 Microcontrollers Help Reduce System Cost and Size
We are surrounded by electrical appliances using motors. In recent years, the variety and numbers have continued to increase, and the controls that are required have grown more diverse. After the 78K and R8C Family, the RL78 microcontrollers (MCUs) have been used in a wide range of applications that use motors. Among the broad device lineup, the RL78/G1F inherited RL78/G14 features and is highly suitable for motor control solutions. On top of the devices to realize motor control, Renesas also provides solutions to aid the development of motor control solutions.
A Variety of Capabilities
The RL78 microcontroller can be used to implement a variety of motor control functions. Here are some application examples and accomplishments.
High-Speed Rotation
High speed rotation control is required for cordless vacuum cleaners, drones, and other small motor applications. Experiments using the RL78/G1F have seen confirmed rotations of more than 500 krpm. We are preparing high-speed rotation solutions to assist in the development of cordless vacuum cleaners.
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High-speed rotation of 50 krpm with a vacuum cleaner motor
Position Estimation at Stop
In general, it is difficult to detect the position of a motor with sensorless control when it is stopped, because detection relies on the induced voltage generated by the rotor. With the RL78/G1F, you can use the polarity of the motor to detect the position when stopped.
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RL78/G1F sensorless BLDC motor initial rotor position detection demo
Refrigerator
The automatic adjustment software for a refrigerator compressor using the RL78/G1F identifies the motor parameters and control gain, and the compressor can be driven instantly with 1-shunt sensorless vector control.
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Refrigerator
High-Speed Rotation Solution
Features
- High-speed rotation at 20 krpm (mechanical angle) or higher can be realized
- The motor settings can be changed (input voltage: 12V to 50V)
- The control parameters can be easily adjusted
- The Renesas Motor Workbench development support tool can be used to adjust these settings easily
| Components | |
|---|---|
| Inverter | GB01 |
| Communication board for tools | USB-Serial converter board |
| Control software | Sensorless rectangular wave control RL78/G1F Sensorless 120-degree conducting control for permanent magnetic synchronous motor (high-speed rotation) Rev.1.00 - Sample Code (ZIP) |
| Development Support Tool | Renesas Motor Workbench |
| Documents | Schematic, BOM, application note |
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Conceptual image
Evaluation Environment
1. Starter Kits and Inverters for Evaluation
| Product Name | Product Number | Vendor | Remarks |
|---|---|---|---|
| 24V Motor Control Evaluation System (RSSK) | RTK0EM0006S01212BJ | Renesas Electronics | DC24V input 5A peak, motor included Discontinued (new RSSK is currently under development) |
| Trial Series Inverter Unit (High Voltage) | T1001, T1102, T1003 | Desk Top Laboratories | AC110V/230V input 300VA to 4KVA |
| Trial Series Inverter Unit (Low Voltage) | T2001, T2003, T2005, T2006, T2007 | Desk Top Laboratories | DC24V/48V input 5A peak to 100A peak |
| Brushless Motor Starter Kit | BLM_EV6 | Hokuto Electronic | DC 7.2V input 2A peak, motor included |
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24V Motor Control Evaluation System (RSSK)
- Easily evaluate motor control using an MCU
- Sample software such as vector control and rectangular wave control is available
- Renesas Motor Workbench development support tool is provided
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- Wide range from low to high voltage
- Useful for evaluation and development
- The ICS++ Development Support Tool is available
CPU Cards
Optional boards for the Evaluation System for BLDC Motor and 24V Motor Control Evaluation System for RX23T. You can purchase additional CPU cards and swap them out to allow motor control with various microcontrollers. Refer to the RL78 Motor Control MCU Lineup for applicable products.
| MCU | Product Number | Vendor | Inverter | Remarks |
|---|---|---|---|---|
| RL78/G14 | RTK0EML130C06000BJ | Renesas Electronics | RSSK, Trial Series Inverter Unit | 64-pin |
| RL78/G14 | T5101 | Desk Top Laboratories | RSSK, Trial Series Inverter Unit | 64-pin |
| RL78/G14 | T5105 | Desk Top Laboratories | RSSK, Trial Series Inverter Unit | 32-pin |
| RL78/G1F | RTK0EML240C03000BJ | Renesas Electronics | RSSK, Trial Series Inverter Unit | 64-pin |
| RL78/G1F | T5103 | Desk Top Laboratories | RSSK, Trial Series Inverter Unit | 64-pin |
| RL78/G1F | HSBRL78G1F-64 | Hokuto Electronic | Brushless Motor Starter Kit | 64-pin |
| RL78/G1G | T5104 | Desk Top Laboratories | RSSK, Trial Series Inverter Unit | 32-pin |
| RL78/G1M | T5108 | Desk Top Laboratories | RSSK, Trial Series Inverter Unit | 20-pin |
2. GB01 Inverter for Evaluation
Features
- Wide voltage range and high current (input voltage of 12 to 50V, peak current of 30A)
- Various types of BLDC motor control are possible (3-shunt, 1-shunt, encoder, Hall, sensorless, FOC, trapezoidal)
- Renesas Motor Workbench with a tool communication board (or ICS) is provided
Specifications
- Input Voltage: DC 12 to 50V
- Input Current Limit: 30[A]＠ shunt 10mΩ
- Current Detection Method: 3-shunt and 1-shunt (DC Link)
- Target Motor: BLDC Motor
- Dead Time: more than 1µs
- Heat dissipation: Natural air cooling with heat sink
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Block Diagram
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Documents
- RL78/G1F Motor Driver Board GB01 User's Manual Rev.1.00 (PDF | English, 日本語) (with circuit diagram and BOM list)
3. MCU Simulator Online
Initial evaluation of the RL78 can easily be started online.
The MCU Simulator Online can be used for the following:
- Checking the terminal output for register settings
- Estimating processing time
- Debugging variable watch functions in software
| Simulation scope | |
|---|---|
| MCU | RL78/G1F |
| Control method | 120-degree conducting control |
| Inverter | RSSK |
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Easily conduct motor driving simulations without motor hardware
Sample Software and Application Notes
Sample Software Porting Support Tool
| Control method | |
|---|---|
| Vector control (sensorless) 1-shunt current detection - For R01AN3992 |
Configuration File Generator for RL78 Motor Control Sample Software Rev.1.10 - Sample Code (ZIP | English, 日本語) |
Documentation
| Title |
|---|
| RL78 MOTOR CONTROL SOLUTION - HOW TO DRIVE SENSORLESS VECTOR CONTROL - Supplementary Material for RL78 Motor Control Solution Introductory Video Rev.1.00 (PDF | English, 日本語) |
RL78 Motor Control MCU Lineup
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For details on each product, please see the RL78 Product Selection Table.
For details on each solution, please contact a sales/distributor location.
