DRM029, 3-Phase PM Synchronous Motor Control with Quadrature

DRM029, 3-Phase PM Synchronous Motor Control with Quadrature

Freescale Semiconductor, Inc.

Designer Reference Manual — 3-Ph PM SMC with Quadrature Encoder

Section 4. Hardware Design

4.1 Contents

4.2

System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

4.3

DSP56F805EVM Controller Board . . . . . . . . . . . . . . . . . . . . . . 36

4.4

EVM Motor Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

4.5

Hardware Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

4.2 System Configuration

The application is designed to drive the 3-phase PM Synchronous motor. It consists of the following modules (see

Figure 4-1

):

• DSP56F805EVM Controller Board

• Evaluation Motor Board

• 3-phase BLDC Motor

U2

40w Flat

Ribbon

Cable

U1

+12

GND

12VDC

J3

Evaluation

Motor

Board

J2

J1 J30

Controller Board

DSP5680xEVM

J23

M1

Motor

ECMTREVAL

DRM029 — Rev 0

MOTOROLA

IB23810

Encoder Cable

Figure 4-1. Low-Voltage Evaluation Motor HW System

Configuration

Hardware Design

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Hardware Design

NOTE:

The application SW is targeted for PM Synchronous motor with sine-wave Back-EMF shape. In this particular demo application the

BLDC motor is used instead. This is due to the availability of the BLDC motor supplied as ECMTREVAL. Although the Back-EMF shape of this motor is not ideally sine-wave, it can be controlled by the application SW.

The drive parameters will be even better when PMSM motor with exactly sine-wave Back-EMF shape is used.

4.3 DSP56F805EVM Controller Board

The DSP56F805EVM is used to demonstrate the abilities of the

DSP56F805 and to provide a hardware tool allowing the development of applications that use the DSP56F805.

The DSP56F805EVM is an evaluation module board that includes a

DSP56F805 part, peripheral expansion connectors, external memory and a CAN interface. The expansion connectors are for signal monitoring and user feature expandability.

The DSP56F805EVM is designed for the following purposes:

• Allowing new users to become familiar with the features of the

56800 architecture. The tools and examples provided with the

DSP56F805EVM facilitate evaluation of the feature set and the benefits of the family.

• Serving as a platform for real-time software development. The tool suite enables the user to develop and simulate routines, download the software to on-chip or on-board RAM, run it, and debug it using a debugger via the JTAG/OnCE

TM

port. The breakpoint features of the OnCE port enable the user to easily specify complex break conditions and to execute user-developed software at full-speed, until the break conditions are satisfied. The ability to examine and modify all user accessible registers, memory and peripherals through the OnCE port greatly facilitates the task of the developer.

• Serving as a platform for hardware development. The hardware platform enables the user to connect external hardware peripherals. The on-board peripherals can be disabled, providing the user with the ability to reassign any and all of the DSP's

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Hardware Design

DSP56F805EVM Controller Board peripherals. The OnCE port's unobtrusive design means that all of the memory on the board and on the DSP chip are available to the user.

The DSP56F805EVM provides the features necessary for a user to write and debug software, demonstrate the functionality of that software and interface with the customer's application-specific device(s). The

DSP56F805EVM is flexible enough to allow a user to fully exploit the

DSP56F805's features to optimize the performance of their product, as shown in

Figure 4-2

.

RESET

LOGIC

MODE/IRQ

LOGIC

DSub

25-Pin

Program Memory

64Kx16-bit

Data Memory

64Kx16-bit

Memory

Expansion

Connector(s)

JTAG

Connector

Parallel

JTAG

Interface

Low Freq

Crystal

DSP56F805

RESET

SPI

MODE/IRQ

Address,

Data &

Control

SCI #0

SCI #1

CAN

TIMER

GPIO

JTAG/OnCE

PWM #1

A/D

PWM #2

XTAL/EXTAL

3.3 V & GND

4-Channel

10-bit D/A

RS-232

Interface

Peripheral

Expansion

Connector(s)

Primary

UNI-3

Secondary

UNI-3

Power Supply

3.3V, 5.0V & 3.3VA

Figure 4-2. Block Diagram of the DSP56F805EVM

DSub

9-Pin

CAN Interface

Debug LEDs

PWM LEDs

Over V Sense

Over I Sense

Zero Crossing

Detect

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Hardware Design

4.4 EVM Motor Board

Motorola’s evaluation motor board (EVM motor board) is a 12-volt,

4-amp power stage that is an integral part of Motorola’s embedded motion control series of development tools. It is supplied in kit number

ECMTREVAL, along with a small brushless dc motor, an encoder, an encoder cable, a 40-pin ribbon cable, and mounting hardware. In combination with one of the embedded motion control series control or evaluation boards, it provides a ready-made software development platform for small brushless dc motors. The motor is capable of being controlled with either Hall sensors, an optical encoder, or with

sensorless techniques.

Figure 4-3

is an illustration of the board.

Motor

Connector

UNI-3

Connector

Power Supply

Connector

Figure 4-3. EVM Motor Board

Designer Reference Manual

38 Hardware Design

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Hardware Design

EVM Motor Board

4.4.1 Electrical Characteristics

The electrical characteristics in

Table 4-1

apply to operation at 25

°C and a 12-Vdc power supply voltage.

Characteristic

Power Supply Voltage

Quiescent Current

Min Logic 1 Input Voltage

Max Logic 0 Input Voltage

Input Resistance

Analog Output Range

Bus Current Sense Voltage

Bus Voltage Sense Voltage

Power MOSFET On Resistance

RMS Output Current

Total Power Dissipation

Table 4-1. Electrical Characteristics

Symbol

Vdc

I

CC

V

IH

V

IL

R

In

V

Out

I

Sense

V

Bus

R

DS(On)

I

M

P diss

Min

10

2.4

0

206

32

Typ

12

50

10

412

40

6

5

Max

16

0.8

3.3

Units

V mA

V

V k

V mV/A mV/V

M

A

W

4.4.2 Motor Characteristics

The motor characteristics in

Table 4-2

apply to operation at 25

°C.

Characteristic

Terminal Voltage

Speed @ V t

Torque Constant

Voltage Constant

Winding Resistance

Table 4-2. Motor Characteristics

Symbol

V t

K t

K e

R t

Min

Typ

5000

0.08

8.4

2.8

Max

60

Units

V

RPM

Nm/A

V/kRPM

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Hardware Design

Winding Inductance

Continuous Current

Peak Current

Inertia

Thermal Resistance

Table 4-2. Motor Characteristics

L

I cs

I ps

J m

8.6

0.075

2

5.9

3.6

mH

A

A kgcm

2

°C/W

4.5 Hardware Documentation

.All the system parts are supplied and documented according the following references:

• M1 - IB23810 Motor

– supplied in kit ECMTREVAL - Evaluation Motor Board Kit

• U2 EVM Motor Board:

– supplied in kit with IB23810 Motor: ECMTREVAL - Evaluation

Motor Board Kit

– described in: Evaluation Motor Board User’s Manual

• U1 CONTROLLER BOARD for DSP56F805:

– supplied as: DSP56805EVM

– described in: DSP Evaluation Module Hardware User’s Manual

Detailed descriptions of individual boards can be found in comprehensive User’s Manuals belonging to each board. The manuals are available on the Motorola web. The User’s Manual incorporates the schematic of the board, description of individual function blocks and a bill of materials. An individual board can be ordered from Motorola as a standard product.

Designer Reference Manual

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