DESIGN AND CONTROL OF

SR-HUB MOTOR

By,

Hemang Joshi

Neel Patel

Jaydeep Thoriya

(110110109030)

(110110109029)

(110110109024)

Guided By,

Prof. Ishaq A. Sheikh

PHASED PROCESS DIAGRAM

Step 2 Step 3

Simulation Production

Mathematical Design

procedure

PIC

Maxwell

Frequency controlled SR motor

Step 1

INTRODUCTION

Advantages over other motor

Introduction to SR-Hub motor

PWM controlled inverter

ADVANTAGES OVER OTHER MOTORS

Not dependent on the direction of flow of current

Easy cooling system

Torque-Speed characteristic can be modified easily

Higher starting torque without heavy in-rush current

SC current is very small

Max temperature limit of rotor is higher as no permanent magnet

are used.

INTRODUCTION TO SR-HUB MOTOR

The stator is made up of the

field windings.

Rotor is made of iron poles.

One type of stepper motor

enclosure

Rotor pole tips Stator

WORKING OF SR MOTOR

SR-HUB MOTOR Difference between SR motor

and SR-Hub motor

SR motor

Rotor is inside

Used for

positioning

SR-hub motor

Rotor is outside

Used for EV

Application

Wheel

Iron and poles

Stator

Shaft

Enclosure

PHASE VOLTAGE SUPPLY SEQUENCE

We are having 30𝑜

phase delay

We are having 15𝑜

Stroke angle

delay

Stroke

Phase A

Phase B

Phase C

Phase D

PWM AC POWER SUPPLYChopping of voltage

MOC7811 FOR POSITION SENSING

Opto coupler

IR Led and photo detector

𝑡𝑜𝑛 = 12-60 𝜇𝑠

INTRODUCTION PIC MICROCONTROLLER Analogue to Digital converter

Analogue and Digital Comparator

Interrupts

In circuit programming

Low operating current (6μA)

Wide operating voltage range (2.0V to 5.5V)

Commercial and Industrial temperature ranges

Selectable oscillator options

Programmable code protection

Watchdog Timer (WDT)

In-Circuit Debug (ICD) via two pins

In-Circuit Serial Programming™ (ICSP™) via two pins

Operating speed: 20 MHz clock input and 200 ns instruction cycle

COMPARISON OF PIC MICROCONTROLLERS

IC 4066 AS GATE COUPLER

Range 3V to 15V

High on state resistance 80Ω at 15V

operation

0.1% distortion highly linear

Extremely low “OFF” time current 0.1 nA

Extremely high control input

impedance 1012Ω

Frequency response, switch “ON” 40

MHz

INTRODUCTION TO PROTON BASIC COMPILER

Very popular

Quick compilation, integrated programmer and

boot loader

For both PC as well as PIC

Commands and syntax fairly simple and English like

Free to use for 16F877 up to 50 lines

INTRODUCTION TO PROTON BASIC COMPILER

POWER CIRCUIT BLOCK DIAGRAM

POWER CIRCUIT

CHOOSING POLE RATIO

Parameters 8/10 8/6

Stroke angle 9 degree 15 degree

Absolute torque zone 18 degree 30 degree

Time for one working

stroke

15ms 25ms

Frequency of excitation

of one phase

33.33Hz 20Hz

Profile of torque Not flat top Flat top

MAIN DESIGN PARAMETERS

Stator pole angle (βs)

Rotor pole angle (βr)

Stator pole area (As)

Rotor pole area (Ar)

Stator pole height (hs)

Air gap length (g)

No of turn per phase (Ntps)

Stator pole pitch (𝜆𝑠)

Stator pole arc length (ts)

Aligned instance (La)

Standard size conductor is SWG20

Stator

Rotor

Stator

Winding

Shaft

Outer

Diameter(Do)

Rotor

Pole Arc

(Br)

Rotor

Bore

Diameter

(D)

Stator

Pole Arc

(Bs)

Stator

Rotor

Stator

Winding

Shaft

Outer

Diameter(Do)

Rotor

Pole Arc

(Br)

Rotor

Bore

Diameter

(D)

Stator

Pole Arc

(Bs)

MAIN MOTOR PARAMETERS

Motor Specification

• Output power = 250W

• Rated Speed = 200 RPM

• Peak value of Current = 7.5A

• Supply Voltage = 48 V

• Stroke angle = 15 degree

INTRODUCTION TO ANSYS MAXWELL

TOTAL 6 TYPE OF PROBLEMS THAT CAN BE SOLVED

Magneto Statics

Electrostatic

Transient

Eddy current

AC Conduction

DC Conduction

HOW MAXWELL SOLVES THE PROBLEM

TRANSIENT PROBLEM SOLUTION IN MAXWELL 2D

In our simulation

• Speed : 0.5 rpm

• Excitation current : 7.5 A

• Result : Torque → Rotor position plot

• Field Overlays : Flux lines and Flux vector

OUTPUT CHARACTERISTIC 𝑇𝑜𝑟𝑞𝑢𝑒 → 𝑅𝑜𝑡𝑜𝑟 𝑝𝑜𝑠𝑖𝑡𝑖𝑜𝑛

Max output torque : 16.5 N.m

RESULTS IN ANSYS MAXWELL 16