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Permanent Magnet DC Motor

A Permanent Magnet DC Motor is a DC motor with permanent magnet poles. The magnets are radially magnetized and placed on the cylindrical steel stator's inner sides. This motor does not have a field coil. It generates torque by the interaction of armature flux and permanent flux. Basically, permanent magnets are used to generate the magnetic field required for DC motor operation. These motors offer continuous torques from 0.117 to 3.955 Nm, and peak torques from 0.883 to 24.716 Nm Typical applications: Robotics and factory automation • Pick-and-place robots • Positioning tables • Welding wire feeders • Automatic guided vehicles • Barcoding equipment Computer and office equipment • Copier and microfilm machines • Printers / plotters • Tape drives Industrial equipment • Automatic door actuators • Material handling equipment • Packaging, marking and sorting equipment • Machine tools • Web drives • Gimbal controlled cameras for security systems • Antenna drives Medical equipment • Electric wheelchairs and scooters • Bio-analytical equipment • Medical pumps • Centrifuges
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Series, Shunt or Compound Motor

The term ‘DC motor’ is used to refer to any rotary electrical machine that converts direct current electrical energy into mechanical energy. DC motors can vary in size and power from small motors in toys and appliances to large mechanisms that power vehicles, pull elevators and hoists, and drive steel rolling mills.

A simple DC motor uses a stationary set of magnets in the stator, and a coil of wire with a current running through it to generate an electromagnetic field aligned with the centre of the coil. One or more windings of insulated wire are wrapped around the core of the motor to concentrate the magnetic field.

The windings of insulated wire are connected to a commutator (a rotary electrical switch), that applies an electrical current to the windings. The commutator allows each armature coil to be energised in turn, creating a steady rotating force (known as torque).

When the coils are turned on and off in sequence, a rotating magnetic field is created that interacts with the differing fields of the stationary magnets in the stator to create torque, which causes it to rotate. These key operating principles of DC motors allow them to convert the electrical energy from direct current into mechanical energy through the rotating movement, which can then be used for the propulsion of objects.

While the principles are the same across variants, there are actually several different types of DC motors, which offer specific advantages and disadvantages over each other.  See product description below for more information.