Brushless DC Motor Control Solution for Vehicles

Expanding Use of Electric Motors in Vehicles

In order to realize safety, security, comfort, and eco-friendliness in automobiles, electronic control systems such as ECUs are becoming more advanced and higher performance. Motors are installed in various in-vehicle systems, and motors are required to be smaller and lighter, have higher output, and rotate at higher speeds. Brushed DC motors are used in automobiles due to their ease of control and miniaturization. However, brushed DC motors have problems with brushes such as frictional noise, sparks and electrical noise, and brush life due to wear. To solve these problems, they have recently been replaced by brushless DC motors (BLDC).

Brushless DC motors (BLDC) are capable of high-speed rotation, and have many advantages such as reliability, high efficiency, compact size, light weight, and long life. It has the disadvantage of complicated control, which increases the cost of system design and software development.

We offer a wide range of motor solutions, including optimal devices for motor control, motor control development kits, and development support tools, to support our customers' smooth transition to BLDC motors.

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Solution

Sensorless Vector Control (Three-shunt)

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Sensorless Vector Control (Single-shunt)

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Products RL78/F1x and RL78/F2x uses a DTC (Data transfer Controller) to enable high-speed sensing of shunt current without software load.
Products RL78/F24 and RL78/F23 support asymmetrical complementary PWM waveform output function suitable for single-shunt method. Vector control is realized with a 16-bit microcomputer. RL78/F23, F24 products are equipped with vector arithmetic support circuit (AAU: Application Accelerator Unit). This circuit realizes high-speed and precise motor control.
RH850/F1KM-S1’s high performance CPU (32-bit & 120 MHz) realizes high-speed and precise motor control.
The A/D converter has 3 channels of sample & hold function (6 channels for 100 pins) and can measure U/V/W phase voltages/currents together. RH850/F1KM-S1 support asymmetrical complementary PWM waveform output function suitable for single-shunt method.
 

Sensorless Trapezoidal Control (A/D Method)

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By using Timer RD and ELC (Event Link Controller), the induced voltage can be captured at high-speed by reducing the software load.

Sensorless Trapezoidal Control (Comparator Method)

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A comparator and capture timer are used to measure the current sense timing. External circuits can be reduced by using the comparators built into products RL78/F14, F15 and RL78/F24.

Hall Sensor Control

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Capture the hall sensor signal and detect the rotation speed of the motor.

Boards & Kits

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12V Motor Control Evaluation System for RL78/F24 This kit is for motor control evaluation with RL78/F24 (48-pin) product. This kit includes a permanent magnetic synchronous motor (TG-55N-KA 12V; Tsukasa Electric Co., Ltd), allowing users to easily start evaluating the motor after purchase. Please contact the distributors or dealers for purchase.

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Desk Top Laboratories Inc. Products ECU001-F14-12V ECU series RL78/F14 evaluation unit This is an evaluation ECU module equipped with RL78/F14 product. This unit alone can drive fans and pumps. In addition, the real-time debugging tool In Circuit Scope can be connected.

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Desk Top Laboratories Inc. Products T1102 Trial series 3kW class high voltage inverter T5102 RL78/F14 Single inverter support card T5109 RL78/F24 Single inverter support card T5212 RH850/F1K-S1 Single inverter support card It is a 3kW class inverter that can be equipped with each CPU card and a CPU card. It can be used up to motors and compressors of the size of air compressor class. Users can test with an inverter similar to the circuit that is actually used. In addition, the real-time debugging tool In Circuit Scope can be connected.

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Desk Top Laboratories Inc. Products W2002 CPU waveform viewer (RAM monitor) ICS++ (In Circuit Scope plus) This tool can display the variables in the software used inside the CPU as an oscilloscope-like time waveform, and at the same time change the variables. With this tool, the insulation between the actual device and the actual device is secured by an optical fiber, so it is possible to debug at a distance of 10m or more from the inverter. In addition, since it can be used without imposing a heavy CPU load on the user software, it is possible to safely and significantly reduce the time required for debugging.