Thenmozhi Murthi
Thenmozhi Murthi
Home Appliance Marketing Specialist [Motor]

Trapezoidal/120 deg is a simple control with back EMF as the feedback for motor position. Back EMF based control minimizes the need for HALL/Encoder and save cost [with sensor installation and maintenance]. Some of the requirements for small appliances ceiling fan/vacuum cleaner/power tools] are high speed operation, high startup torque control, position detection and locked rotor condition. With rich peripherals and built-in PGA, RX13T serves as the best cost optimized 32-bit MCU for small appliance motor control.

Three key takeaways with this RX13T based 120 deg motor solutions:

  1. Motor evaluation platform [48V/5A Inverter + RX13T CPU card] with demo motor
  2. Software with peripheral configuration and trapezoidal control algorithm
  3. Renesas Motor Workbench [free graphical visualization tool] to monitor or adjust motor control parameters
RX13T based 120 deg motor solution

Although Trapezoidal/120 deg is relatively straightforward, Motor experts still need to take care of few things: starting up current, zero crossing detection, 6 commutation steps, closed loop speed control. A sample project with the control blocks would simplify the development process and time. Also, a tailormade code for peripheral configuration would be handy for motor experts to get started with motor solution development. In addition, customer can evaluate the trapezoidal algorithm within minutes using Renesas real-time visualization tool [Renesas motor workbench]

Reflecting on our customer voice, this solution aim to address 2 major challenges: Faster development/time to market and system BOM cost reduction. With floating point unit and high-level language [C] coding, RX13T is a viable 32-bit MCU to realize 120deg [even capable of driving Field oriented control]. With fast ADC + built-in PGA, BOM cost reduction would be seamless for the next generation motor control design

In summary, a 32-bit MCU for small appliance is practical/affordable today. RX13T is the best in class and cost-effective  32-bit MCU for motor control for small appliances. RX13T feature highlights: 32 MHz [3.37 CoreMark/MHz] with FPU, ADC with 3 channel simultaneous sample and hold circuit and built in PGA, 3-phase complementary PWM. Customer can easily evaluate Renesas RX13T MCU with this solution offering:  a motor evaluation platform, sample software and Renesas motor workbench tool. Lastly, the RX13T 32-bit MCU for motor control was launched on our RX 10th anniversary milestone.

Feel free to check out this solution with application note # R01AN5650EJ100 and sample code with our Evaluation System for BLDC motor platform.

Click here for the Motor Control Solutions.
Click here for the Evaluation System for BLDC Motor.
Click here for the RX13T products.
Click here for application note # R01AN5650EJ100 and here for the sample code.

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