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Electric Motor

From DT Online

ElectricMotor.png


Description

Electric motors are devices for changing electrical energy into rotational movement. The turning power or torque of a motor can vary greatly. Generally speaking small motors have low torque whereas large motors usually have a high torque rating.


Features and Applications

Motors come in alternating current (AC) and direct current (DC) versions, DC types of between 3 - 12 volts being most suitable for general use. The current direction controls the direction of rotation for DC motors.


It is usually necessary to ‘gear down’ a motor as their speed of rotation (typically 2400rpm) is too great. This can be achieved either mechanically or electronically.


DC Motors have the advantage of being relatively inexpensive and can be obtained in high torque versions which are most suitable for driving models. The motor's speed can be controlled over a wide range (e.g. using a variable supply voltage)


Stepper Motors respond to electrical pulses sent from an external Driver Circuit or via computer or micro-processor control. Each pulse causes the motor to rotate by a single increment (or Step) and then lock in that position. The process can be repeated and a continuous stream of pulses will result in full rotations but the motors are used mainly to turn to a precise angle or through a set number of rotations.


Model DC Motors in Transistor Circuit
Motor Schematic.png

DC motors are available in a range of voltages and power outputs. Some are also available with an integral earbox to reduce the output shaft speed. Small DC motors are designed for light duty work such as model systems, rotating signs etc.


Reversing the polarity of the supply to the motor causes it to rotate in the opposite direction. Stopping the motor by removing the supply and then connecting the two motor terminals together causes the motor to be braked rapidly.


The purpose of the IN4001 Diode shown is to restrict any Back EMF resulting from the Transistor being used to switch an inductive device (e.g. Electric Motor, Solenoid or Relay).


DT Online Buyers' Guide
5PCS 130-16140 6V 12500RPM DC Motor w Varistor for Smart Car Model Toy DC 3.7V 48000RPM Magnetic Micro Coreless Motor Propeller for RC Toy 1700-7300RPM 1.5-6.5V High Torque Cylinder Electric Mini DC Motor DC 12V 20000RPM 6V 6000RPM Electric Motor for DIY Toys Cars Spiratronics Motor With Worm Drive Gearbox Spiratronics Miniature Round Motor TSINY Small 12v DC Worm Gear Reducer Motor Reversible Speed 110Rpm for DIY Parts 12V 24V 30V 120W PWM Adjustable Volt DC Motor Speed Controller CCM2 28BYJ-48 28BYJ48 DC 5V 4-Phase 5-Wire Arduino Stepper Motor with ULN2003 Driver Board XCSOURCE Nema 17 2 Phase 4-Wire 1.8 degree Stepper motor 42 x 42 x 34mm For 3D Printer TE225 EasyDriver Stepper Motor Driver
5x 130-16140 6V 12500RPM DC Motor & Varistor DC 3.7V 48000RPM Magnetic Micro Coreless Motor Propeller 1700-7300RPM 1.5-6.5V High Torque Electric Mini DC Motor DC 12V 20000RPM 6V 6000RPM Electric Motor Spiratronics Miniature Round Motor Spiratronics Motor With Worm Drive Gearbox Small 12v DC Worm Gear Reducer Motor Reversible Speed 110rpm 12V 24V 30V 120W PWM Adjustable Volt DC Motor Speed Controller DC 5V 4-Phase 5-Wire Arduino Stepper Motor & Driver Board 2 Phase 4-Wire 1.8 deg. Stepper motor for 3D Printer EasyDriver Stepper Motor Driver