AN1115 Datasheet PDF - ST Microelectronics
| Part Number | AN1115 | |
| Description | ST52X301 FOR STEPPER MOTORS FUZZY CONTROL | |
| Manufacturers | ST Microelectronics | |
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AN1115
® APPLICATION NOTE
ST52x301 FOR STEPPER MOTORS FUZZY CONTROL
Authors: G. Grasso, M. Lo Presti
1. INTRODUCTION
This application note is intended to explain how to control a stepper motor by using ST52x301 Fuzzy
Microntroller.
Stepper Motors are well known in position controls field applications and are particularly used in Robo-
www.DataStihcese,t4CUo.cmomputer peripherals, Industrial servo quality drivers and so on. One of the main advantages of
stepper motors is the strong relation between electrical pulses and rotation discrete angle steps. This al-
lows to exactly know the shaft position of the motor without using a position sensor.
Depending on the building characteristics of the motor and its driving techniques, it is possible to have a
wide range of stepper motors. Generally speaking, permanent magnetic cores are referred to as Stepper
Motor while soft iron cores are referred to as Variable Reluctance Motors.
2. FUNCTIONAL DESCRIPTION
The Stepper Motor’s operating principle used in the current implementation, is described in fig. 1. A 12-
pole stator is energized by means of a 3-phase winding. Each coil is assembled in order to generate, in
the space, the same number of magnetic poles. The rotor consists in a permanent magnetic core sha-
ded in order to produce 8 magnetic poles.
The poles produced by the stator current force the rotor to move in order to be aligned to the rotor ma-
gnetic field. This implies an alignment of the rotor core’s nearest pole to the stator energized poles.
When the phase Φ1 is energized, the rotor pole P1 is aligned to the field. Then, if the phase Φ1 is de-
energized and Φ2 is energized, a new set of magnetic poles will be created in the stator. This new ma-
gnetic field will force the rotor to move in counterclockwise direction to align its poles to the field. This ac-
tion yields a shaft rotation of a step angle q.
Generally, for a q-phase motor with Nr rotor teeth, the following equation is given:
Then, in our application:
Step_angle
=
360°
qNr
15°=
360°
3x8
The spin direction can be controlled by a phase excitation sequence. Excitation sequence Φ1, Φ3 and
Φ2 will move the rotor clockwise.
From energy considerations, it can be shown that:
T=f(i, dL )
dθ
This general relation is true for any kind of stepper motor. For instance, the strong relation between T
and dL/dθ allows the Variable Reluctance motor to move.
January 1999
1/16
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Figure 5
ST52x301 FOR STEPPER MOTORS FUZZY CONTROL
www.DataSheet4U.com
® 5/16
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AN1115 electronic component. |
| Information | Total 16 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ AN1115.PDF Datasheet ] | |
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