12. HPM5300_RDC

12.1. Depend on SDK1.10.0

12.2. Overview

High performance motor control applications traditionally require a speed or position sensor for control loop feedback. The position feedback link has a critical impact on the performance of the system. Rotary transformers have become popular Angle sensors due to their advantages such as impact resistance, high temperature resistance, oil pollution resistance, high reliability, and long life.

At present, most of the existing rotary solutions in the market are discrete, with high BOM cost and large board area.

In order to simplify the design, HPM provides a functional rotary decode board integrating excitation op amp circuit, boost DC-DC chip, analog front end, rotary digital converter, rotary signal loss detection and multiple format data (position/speed) output interface.

12.3. hardware solution

HPM5300RDC board has the following functions: two ADC, one uart, one spi, two DAC, QEO output, SEI master/slave, LED display, etc.

HPM5300RDCschematic diagram: 《HPM5300_RDC_REVB》

12.3.1. software solution

The software solution is mainly composed of the following parts:

pwm generates the excitation signal, ADC samples it, and takes the envelope.

12.3.2. TEST

This scheme is divided into two parts:

(1) Hardware test: pwm modulated sinusoidal differential signal (EXC_P/EXC_N), rotary sinusoidal winding signal (OSIN/OCOS) (2) Functional test: Angle and speed observation

12.3.3. test instrument

（1）Motor drive platform

platform

（2）hHPM5300RDC

rdc

12.3.4. testing environment

(1)HPM_RDC decoding software: soft_rdc (2) ozone (3) Jlink (4) RDC board pin description

function	rotary plate location	note
EXC+	J4[5]	rotary exc signal
EXC-	J4[6]	rotary exc signal
COS+	J4[1]	rotary cos signal
COS-	J4[2]	rotary cos signal
SIN+	J4[3]	rotary sin signal
SIN-	J4[4]	rotary sin signal
PWR	J3[5]	24v,150mA
GND	J3[4]	GND
OEXC	R17
PWM	R16
sin	R16