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4 More Types of Electric Motors You Should Know About


As we mentioned in last month’s article 4 Types of Electric Motors You Should Know About, an electric motor is just a motor that runs using electricity instead of a combustion engine using fuel. But electric motors have many different configurations or that work in distinctly different ways. Here are a few of them.

DC electric motor repair underway at an electric motor repair shop in Atlanta, GA

DC Shunt Motor

Shunt motors are brushed DC motors designed for maintaining a constant speed. The windings of these motors connect in parallel with the shunt armature. This ensures even current distribution between the windings and the armature, allowing the motor to manage its speed easily. This makes the DC shunt electric motor perfect for functions such as:

  • Elevators
  • Conveyor systems
  • Power tools such as lathes and grinders
  • Small printing presses
  • Vacuum cleaners
  • Washing machines

Cumulative Compound Motor

Cumulative compound motor—AKA a Cumulative compound motor works with large loads and then runs smoothly after getting up to speed. This is a motor where the shunt field flux produced by the shunt winding enhances the main field flux produced by the series winding. The result is a varying-speed motor with a high starting torque. This makes it perfect for uses such as:

  • Compressors
  • Power tools such as circular saws and rotary presses
  • Elevators
  • Continuous conveyor systems

Slip Ring Rotor Electric Motor

A slip ring induction motor–AKA a wound-rotor motor, is a type of induction motor with rotor windings connected through slip rings to external resistance. This resistance can be adjusted to control the speed of the motor. As a result, this motor can start with a low inrush current with high resistance, which can be reduced as the motor gets up to speed. This provides a high starting torque and significant overload capacity for the motor allowing it to be perfect for functions that require high starting torque and precise speed control. This makes this design extremely popular for industrial operations such as:

  • Industrial compressors
  • Line shafts
  • Printing presses
  • Pumps
  • Winding machines

Capacitor Start Induction Run Motor

This is a split-phase motor that has a starting capacitor connected in series with its start winding. This allows it to generate a moderately high starting torque that runs at a constant speed. These types of motors are often used for:

  • Air conditioners
  • Drive pumps and compressors
  • Machine tools
  • Small portable hoists
  • Refrigerators

Tekwell Services Is Your Electric Motor Expert

Whether you need repairs on AC electric motors or DC electric motors, Tekwell’s got you covered. We provide a complete suite of repair and preventive maintenance services for all types and configurations of electric motors. For more information, give us a call (toll-free) at 1-888-984-4668 or fill out our quick solution form to contact one of our electric motor experts today.