How do Stepper Motors work? (Part 1) Stepper motor types

How do Stepper Motors work? (Part 1) Stepper motor types


in this video we will see what the
stepper motors is considered the ideal choice for all those applications that
require maximum precision in angular movements and rotational speed stepper
motors in fact offer excellent speed control repeatability of movement and
precise positioning the same precise positioning required during the
operation of this robotic arm used by JAES inside its automated video
acquisition system in this case the robotic arm is powered by a stepper
motor that allows the arm to position the objects with extreme precision on
the conveyor belt a stepper motor is an electromechanical device achieving
mechanical movements through conversion of electrical pulses this type of motor
is in fact driven by a digital pulses rather than by a continuous applied
voltage unlike conventional electric motors which rotate continuously stepper
motors rotate or step in fixed angular increments stepper motors are known by
their property of converting a train of input pulses typically square wave
pulses into precisely defined increment in the shaft position each pulse moves
the shaft through a fixed angle there are 3 type of stepper motors
permanent magnet stepper motors variable reluctance stepper motors and hybrid
stepper motors in any stepper motor eddy currents waste energy through heat and
create an electromagnetic forces that oppose the main motor force for this
reason its stator is made of magnetic core materials with lower electrical
conductivity in order to reduce the losses here you can see a simple
permanent magnet stepper motor with 4 stator teeth 2 windings which are
separated into 2 coils and fed by 2 separate DC power sources the
rotor instead is made up of a permanent magnet energizing a coil winding create
magnetic field with a north and a South Pole the stator carries the magnetic
field which causes the rotor to align itself with the magnetic field the
rotating magnetic field can be altered by sequentially energizing or stepping
the stator coils will generates rotary motion if you want to learn more about
rotating magnetic field and synchronous speed you can watch our video about the
working principle of induction motors by clicking the link at the top right
corner of this video the rotor poles are atracted by the moving polarities of the
coils so the rotor rotates 90 degrees in the exact position that the stator will
order coils and magnets can be added to increase accuracy in this example we can
observe the mechanical behavior of a stator with 8 teeth 2 different windings
which are separated in 4 coils and rotor with 2 pole pairs in this variable
reluctance stepper motor the rotor is made of soft iron here the coils are
energized in a certain sequence so only one pair of rotor teeth are aligned to
to the stator at a time the rotor always as less teeth than the stator and
the coils are excited in sequence in this way the excited coil will always
attract the nearest tooth to itself more than 10 years in industrial supplies have
led JAES to become a qualified partner for some of the most important
industrial automation companies providing its technical support over a
wide range of stepper motor types installed in many robotic arms in the
second part of this video we will see how the hybrid stepper motor works this
is the most used stepper motors type today which combines the feature of a
stepper motor with those of a variable reluctance stepper motor if you found
this video useful please let us know by leaving a like and a comment you can
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out our next project by visiting our website jaescompany.com

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