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Internet Tutorial Russian Embroidery DC Motors and Stepper Motors used as Actuators.As well as conventional rotary DC motors, linear motors are also available which are capable of producing a continuous liner movement.There are basically three types of conventional electrical motor available AC type Motors, DC type Motors and Stepper Motors.A Typical Small DC Motor.The Ultimate and easy Motor Controller for your School and Home projectsThe L298 N Motor Controller Board is the standard use for Arduino projects that can Turn.AC Motors are generally used in high power single or multi phase industrial applications were a constant rotational torque and speed is required to control large loads such as fans or pumps.In this tutorial on electrical motors we will look only at simple light duty DC Motors and Stepper Motors which are used in many different types of electronic, positional control, microprocessor, PIC and robotic type circuits.The Basic DC Motor.The DC Motor or Direct Current Motor to give it its full title, is the most commonly used actuator for producing continuous movement and whose speed of rotation can easily be controlled, making them ideal for use in applications were speed control, servo type control, andor positioning is required.A DC motor consists of two parts, a Stator which is the stationary part and a Rotor which is the rotating part.The result is that there are basically three types of DC Motor available.Brushed Motor This type of motor produces a magnetic field in a wound rotor the part that rotates by passing an electrical current through a commutator and carbon brush assembly, hence the term Brushed.The stators the stationary part magnetic field is produced by using either a wound stator field winding or by permanent magnets.Generally brushed DC motors are cheap, small and easily controlled.Brushless Motor This type of motor produce a magnetic field in the rotor by using permanent magnets attached to it and commutation is achieved electronically.They are generally smaller but more expensive than conventional brushed type DC motors because they use Hall effect switches in the stator to produce the required stator field rotational sequence but they have better torquespeed characteristics, are more efficient and have a longer operating life than equivalent brushed types.I based the tester on EasyDriver by Brian Schmalz an open source bipolar stepper motor driver board based on Allegro A3967 driver chip.A3967 makes connecting a.At first I attempted to use for the motor voltage the same 5V supplied by Arduino but because of the floating middle point the max voltage across each winding was.Occasionally you may come across an old stepper motor salvaged from a printer, or an ancient floppy drive.If you are lucky, there will be a part number on the motor.Floppy Drive Stepper Motor Arduino Tutorial' title='Floppy Drive Stepper Motor Arduino Tutorial' />Servo Motor This type of motor is basically a brushed DC motor with some form of positional feedback control connected to the rotor shaft.They are connected to and controlled by a PWM type controller and are mainly used in positional control systems and radio controlled models.Normal DC motors have almost linear characteristics with their speed of rotation being determined by the applied DC voltage and their output torque being determined by the current flowing through the motor windings.The speed of rotation of any DC motor can be varied from a few revolutions per minute rpm to many thousands of revolutions per minute making them suitable for electronic, automotive or robotic applications.By connecting them to gearboxes or gear trains their output speed can be decreased while at the same time increasing the torque output of the motor at a high speed.The Brushed DC Motor.A conventional brushed DC Motor consist basically of two parts, the stationary body of the motor called the Stator and the inner part which rotates producing the movement called the Rotor or Armature for DC machines.The motors wound stator is an electromagnet circuit which consists of electrical coils connected together in a circular configuration to produce the required North pole then a South pole then a North pole etc, type stationary magnetic field system for rotation, unlike AC machines whose stator field continually rotates with the applied frequency.The current which flows within these field coils is known as the motor field current.These electromagnetic coils which form the stator field can be electrically connected in series, parallel or both together compound with the motors armature.A series wound DC motor has its stator field windings connected in series with the armature.Likewise, a shunt wound DC motor has its stator field windings connected in parallel with the armature as shown.Series and Shunt Connected DC Motor.The rotor or armature of a DC machine consists of current carrying conductors connected together at one end to electrically isolated copper segments called the commutator.The commutator allows an electrical connection to be made via carbon brushes hence the name Brushed motor to an external power supply as the armature rotates.The magnetic field setup by the rotor tries to align itself with the stationary stator field causing the rotor to rotate on its axis, but can not align itself due to commutation delays.The rotational speed of the motor is dependent on the strength of the rotors magnetic field and the more voltage that is applied to the motor the faster the rotor will rotate.By varying this applied DC voltage the rotational speed of the motor can also be varied.Conventional Brushed DC Motor.The Permanent magnet PMDC brushed DC motor is generally much smaller and cheaper than its equivalent wound stator type DC motor cousins as they have no field winding.In permanent magnet DC PMDC motors these field coils are replaced with strong rare earth i. 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Samarium Cobolt, or Neodymium Iron Boron type magnets which have very high magnetic energy fields.The use of permanent magnets gives the DC motor a much better linear speedtorque characteristic than the equivalent wound motors because of the permanent and sometimes very strong magnetic field, making them more suitable for use in models, robotics and servos.Although DC brushed motors are very efficient and cheap, problems associated with the brushed DC motor is that sparking occurs under heavy load conditions between the two surfaces of the commutator and carbon brushes resulting in self generating heat, short life span and electrical noise due to sparking, which can damage any semiconductor switching device such as a MOSFET or transistor.To overcome these disadvantages, Brushless DC Motors were developed.The Brushless DC Motor.The brushless DC motor BDCM is very similar to a permanent magnet DC motor, but does not have any brushes to replace or wear out due to commutator sparking.Therefore, little heat is generated in the rotor increasing the motors life.The design of the brushless motor eliminates the need for brushes by using a more complex drive circuit were the rotor magnetic field is a permanent magnet which is always in synchronisation with the stator field allows for a more precise speed and torque control.Then the construction of a brushless DC motor is very similar to the AC motor making it a true synchronous motor but one disadvantage is that it is more expensive than an equivalent brushed motor design.The control of the brushless DC motors is very different from the normal brushed DC motor, in that it this type of motor incorporates some means to detect the rotors angular position or magnetic poles required to produce the feedback signals required to control the semiconductor switching devices.The most common positionpole sensor is the Hall Effect Sensor, but some motors also use optical sensors.Using Hall effect sensors, the polarity of the electromagnets is switched by the motor control drive circuitry.Then the motor can be easily synchronized to a digital clock signal, providing precise speed control.Brushless DC motors can be constructed to have, an external permanent magnet rotor and an internal electromagnet stator or an internal permanent magnet rotor and an external electromagnet stator.Advantages of the Brushless DC Motor compared to its brushed cousin is higher efficiencies, high reliability, low electrical noise, good speed control and more importantly, no brushes or commutator to wear out producing a much higher speed.However their disadvantage is that they are more expensive and more complicated to control.The DC Servo Motor.DC Servo motors are used in closed loop type applications were the position of the output motor shaft is fed back to the motor control circuit.Typical positional Feedback devices include Resolvers, Encoders and Potentiometers as used in radio control models such as aeroplanes and boats etc.A servo motor generally includes a built in gearbox for speed reduction and is capable of delivering high torques directly.The output shaft of a servo motor does not rotate freely as do the shafts of DC motors because of the gearbox and feedback devices attached.DC Servo Motor Block Diagram. 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