AD-DYNO2-EBZ Dynamometer Drive System

Features

  • Two BLDC motors connected in a dyno setup (BLY171S-24V-4000 and BLY171D-24V-4000)

  • Electronically adjustable load - the load value is set using the onboard buttons and LCD

  • Programmable step and ramp load changes

  • Measurement and display of load motor phase currents

  • Measurement and display of load motor speed

Block Diagram

AD-DYNO2-EBZ block diagram

Figure 1 AD-DYNO2-EBZ block diagram

Key Parts

Part

Description

Power

ADuM5000

isoPower® integrated isolated dc-to-dc converter

ADP3335

High accuracy ultralow quiescent current, 500 mA, AnyCAP® LDO

Isolation

ADUM3223

3 kV RMS isolated precision half-bridge driver, 4 A output

Control

ADUC7023

Precision Analog Microcontroller, 12-bit Analog I/O, ARM7TDMI MCU

User Guide

The system is equipped with an LCD which displays information about the state of the load. Together with the 3 push buttons placed below it, the LCD is used to display and configure different system parameters. The +/- buttons navigate through the system menu and change system parameters. The Enter button confirms parameter changes or enters / exits the menu screens.

Dyno menu diagram

Figure 2 Dyno menu diagram

  1. Main menu is displayed at power up.

  2. The measurement menu displays RMS phase currents and motor speed. The load can be adjusted by pressing the “+” or “-” buttons. Press “Enter” to return to the main menu.

  3. Waveforms menu. Select ramp or step load. Select “…” and press “Enter” to go back.

  4. Step load menu. Select “Step” to start toggling the load.

  5. Press “+” or “-” to toggle between the preset step values. Press “Enter” to go back.

  6. Set maximum duty cycle. Press “Enter” to go back.

  7. Set minimum duty cycle. Press “Enter” to go back.

  8. Ramp load menu. Press “+” or “-” to change ramp period. Press “Enter” to go back.

  9. Settings menu. Select “…” and press “Enter” to go back.

  10. Change duty cycle step.

  11. About.

External Control

To interface the Dyno with an external control system:

  • Slide switch S2 to EXT_CTRL position

  • Connect to header P1

Dynamometer external control header

Figure 3 Dynamometer external control header

The available external signals are:

Dyno Signal

Description

I_A

Phase A motor current (185 mV/A)

I_B

Phase B motor current (185 mV/A)

PWM1

Phase A PWM (3.3 V levels)

PWM2

Phase B PWM (3.3 V levels)

PWM3

Phase C PWM (3.3 V levels)

Warning

The system needs a 5 V 500 mA power supply. The power connector is a 2.1 x 5.5 mm jack with the center pin positive (+).