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| Electronic Theory Basic principles, ideas, concepts, laws, and formulas behind electronics. |
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27th March 2006, 01:02 PM
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 control of stepper motor
On this page, I will explain about the operation principle of stepper motor. There are many kind of stepper motors. Unipolar type, Bipolar type, Single-phase type, Multi-phase type... Single-phase stepper motor is often used for quartz watch. On this page, I will explain the operation principle of the 2-phase unipolar PM type stepper motor. In the PM type stepper motor, a permanent magnet is used for rotor and coils are put on stator. The stepper motor model which has 4-poles is shown in the figure on the left. In case of this motor, step angle of the rotor is 90 degrees. As for four poles, the top and the bottom and either side are a pair. coil, coil and coil, coil correspond respectively. For example, coil and coil are put to the upper and lower pole. coil and coil are rolled up for the direction of the pole to become opposite when applying an electric current to the coil and applying an electric current to the coil. It is similar about and , too. The turn of the motor is controlled by the electric current which pours into , , and . The rotor rotational speed and the direction of the turn can be controlled by this control. Clockwise control , , and are controlled in the following order. Step angle 0 1 0 1 0° 1 0 0 1 90° 1 0 1 0 180° 0 1 1 0 270° "0" means grounding. Counterclockwise control , , and are controlled in the following order. Step angle 0 1 0 1 0° 0 1 1 0 -90° 1 0 1 0 -180° 1 0 0 1 -270° "0" means grounding. You can find by the figure, the rotor is stable in the middle of 2 poles of stator. When one side of the stator polarity is changed, the bounce by the magnetism occurs. As a result, the direction of rotor's turn is fixed. The characteristic of stepper motor is the angle can be correctly controlled and to be stable rotates ( It is due to the reliability of the control signal ). Moreover, because the rotor is fixed by the magnetism in the stationary condition as shown in the principle, the stationary power(Stationary torque) is large. It suits the use to make stop at some angle. -------------------------------------------------------------------------------- The motor which was used this time is 48 steps and the step angle is 7.5 degrees. The way of controlling is the same as the previous example completely. It operates when controlling the electric current of coil, coil, coil and coil. The case of the clockwise control is shown below. The combination of , , and repeats four patterns. Step angle 0 1 0 1 0.0° 1 0 0 1 7.5° 1 0 1 0 15.0° 0 1 1 0 22.5° 0 1 0 1 30.0° 1 0 0 1 37.5° 1 0 1 0 45.0° 0 1 1 0 52.5° 0 1 0 1 60.0° 1 0 0 1 67.5° 1 0 1 0 75.0° 0 1 1 0 82.5° 0 1 0 1 90.0° 1 0 0 1 97.5° 1 0 1 0 105.0° 0 1 1 0 112.5° 0 1 0 1 120.0° 1 0 0 1 127.5° 1 0 1 0 135.0° 0 1 1 0 142.5° 0 1 0 1 150.0° 1 0 0 1 157.5° 1 0 1 0 165.0° 0 1 1 0 172.5° Step angle 0 1 0 1 180.0° 1 0 0 1 187.5° 1 0 1 0 195.0° 0 1 1 0 202.5° 0 1 0 1 210.0° 1 0 0 1 217.5° 1 0 1 0 225.0° 0 1 1 0 232.5° 0 1 0 1 240.0° 1 0 0 1 247.5° 1 0 1 0 255.0° 0 1 1 0 262.5° 0 1 0 1 270.0° 1 0 0 1 277.5° 1 0 1 0 285.0° 0 1 1 0 292.5° 0 1 0 1 300.0° 1 0 0 1 307.5° 1 0 1 0 315.0° 0 1 1 0 322.5° 0 1 0 1 330.0° 1 0 0 1 337.5° 1 0 1 0 345.0° 0 1 1 0 352.5° Circuit drawing of Stepper Motor controller -------------------------------------------------------------------------------- Pattern drawing of Stepper Motor controller (Wiring side) Last edited by ElectroMaster; 5th October 2006 at 01:37 AM. | |
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3rd April 2006, 01:08 PM
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Good work sanjeevi
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3rd April 2006, 06:57 PM
| #3 |
| Stepper Motor controller
I don't see any image or file to download where you indicate the schematic is supposed to be. Am I doing something wrong? Please advise, TIA. Joe
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7th April 2006, 01:41 PM
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Stepp Motor Driver.
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25th June 2006, 03:13 AM
| #5 |
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Good work think you
__________________ I do you see X Plus | |
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29th June 2006, 05:48 PM
| #6 |
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Here are some links for controlling stepper motor using AVR microcontroller http://booksbybibin.14.forumer.com/viewtopic.php?t=10 http://booksbybibin.14.forumer.com/viewtopic.php?t=9 | |
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1st August 2006, 11:20 AM
| #7 |
| Stepper
This design implements a simple stepper motor controller using a PIC16F84. The two buttons cause the motor to rotate clockwise or anticlockwise using a standard two-coil drive pattern. The ULN2003A darlington driver provides the interface between the low current PIC outputs and the stepper motor coils.  Code: LIST p=16F84 ; PIC16F844 is the target processor
#include "P16F84.INC" ; Include header file
CBLOCK 0x10 ; Temporary storage
pos
dc1
dc2
ENDC
LIST p=16F84 ; PIC16F844 is the target processor
#include "P16F84.INC" ; Include header file
CBLOCK 0x10 ; Temporary storage
ENDC
ORG 0
entrypoint goto start
ORG 4
intvector goto intvector
start clrw ; Zero.
movwf PORTB ; Ensure PORTB is zero before we enable it.
bsf STATUS,RP0 ; Select Bank 1
movlw 0xF0 ; Set port B bits 0-3 as outputs
movwf TRISB ; Set TRISB register.
bcf STATUS,RP0 ; Select Bank 0
movlw 3 ; Initialize the motor position
movwf pos
movwf PORTB
call delay
clrf PORTB ; Motor drive off
;Main loop
loop btfss PORTA,0 ; Test clockwise button
call stepcw
btfss PORTA,1 ; Test anti-clockwise button
call stepccw
goto loop
;Rotate one step clockwise
stepcw bcf STATUS,C ; Clear the carry flag
btfsc pos,3 ; Set carry if this bit set
bsf STATUS,C
rlf pos,W ; Pick up and rotate the motor's current position
andlw 0x0F ; Mask to lower nibble
movwf pos
movwf PORTB ; Drive the outputs
call delay ; Wait
clrf PORTB ; Clear the output
return
;Rotate one step counter clockwise
stepccw bcf STATUS,C ; Clear the carry flag
btfsc pos,0
bsf pos,4
rrf pos,W ; Pick up and rotate the motor's current position
andlw 0x0F ; Mask to lower nibble
movwf pos
movwf PORTB ; Drive the outputs
call delay ; Wait
clrf PORTB ; Clear the output
return
; This routine implements the delay between steps,
; and thus controls the motor speed.
delay movlw 18 ; Outer loop iteration count
movwf dc1
dl1 clrf dc2 ; Initialize inner loop
dl2 nop
nop
decfsz dc2,F
goto dl2
decfsz dc1,F
goto dl1
return
END
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2nd August 2006, 08:10 AM
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But i cannot see the diagrams Quote:
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4th August 2006, 12:52 PM
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Circuit drawing of Stepper Motor controller -------------------------------------------------------------------------------- Pattern drawing of Stepper Motor controller (Wiring side) Where r all those schematics, u mentioned? आपने "Circuit drawing of Stepper Motor controller" लिखा तो है पर circuit diagram कहाँ है? | |
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8th August 2006, 05:48 AM
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good work and very nice project that ever i see
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24th August 2006, 08:59 AM
| #11 |
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Hi people I am hardly looking for stepper motor control tuttorial for pic 16 f62x. Glaad for help | |
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24th August 2006, 12:54 PM
| #12 | |
| Quote:
__________________ Gods own Country Incredible !ndia www.flickr.com/photos/_akg/ "Give a man a fish, and he will eat for a day. Teach that man to fish, and he will eat for a lifetime." | ||
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24th August 2006, 03:53 PM
| #13 | |
| Quote:
 Why should I look hard when he's hardly looked for it himself!
__________________ Don't make me reach through this monitor to slap you a good one! | ||
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25th August 2006, 10:42 PM
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Anybody please tell me how to identify the cables of a stepper motor. I mean which will be connected to which pin of which port of MCU. Also please help me how to connect some toy tires to the motor. I am not looking for a rover like thing but want to actually test whether a motor can be really tested for speed and direction. I'll be thankful for that.
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26th September 2006, 01:07 AM
| #15 |
| good day dudes!
im sorry for spamming your thread....  im kinda new here... we have a project (interfacing stepper motor unto computer (PC)) by using the programming language turbo-c....anyone pls help me  or pls send me some links | |
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| Tags |
| control, motor, stepper |
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