Coreless DC Motors

A Coreless DC motor from MICROMO differs from conventional, iron rotor DC motors in that they are equipped with an ironless, self-supporting, skew-wound copper coil. Because of this construction, the rotor is very light yielding a low moment of inertia. The rotor also rotates smoothly without cogging.

MICROMO offers the following coreless DC motors:

Features Coreless DC Motors Flat Coreless DC Motors High Power PMDC Motors
Commutation Precious Metal or Graphite Precious Metal Graphite
Motor Diameter 6 ... 38 mm 15 ... 26 mm 34 to 100 mm
Motor Length 15 ... 63 mm 5.2 ... 8.2 mm 94-202 mm
Shaft Diameter 1.5 ... 6.0 mm 1.5 mm  
Nominal Voltage 1,5 ... 48 Volt 2 ... 12 Volt 24 ... 180 Volt
Speed 5000 ... 13000 rpm 5500 ... 10000 rpm 3000 ... 6000 rpm
Continuous Torque 0.11 ... 110 mNm 0.05 ... 3.0 mNm  
Links to Data Sheets [Coreless DC Motors Data Sheets] [Flat Coreless DC Motors Data Sheets] [High Power PMDC Motors Data Sheets]

 

Benefits of a Coreless DC Motor:

  • No magnetic cogging
  • High acceleration and deceleration due to the low moment of inertia
  • Low electromagnetic interference
  • Low inductance
  • High efficiency
  • Linearity between voltage and speed
  • Linearity between load and speed
  • Linearity between load and current
  • Small torque ripple due to the multi-segment commutator
  • Compact design

DC Motor Application Considerations

A 4-page tutorial providing guidelines for the selection of DC motors:
- Audible noise
- Electro-magnetic interference
- Motor service life
DC Motor Application Considerations

How to Select a DC Motor

A 4-page tutorial describing the basic calculations and inputs needed to properly size a DC motor including:
- Available voltage
- Output torque required
- Output speed required
- Physical envelope available
- Operating temperature
How to Select a DC Motor

Motor Calculations

A 9-page tutorial detailing the steps needed to properly size and select a DC motor including:
- Calculating the mechanical power requirements
- Torque-speed curves
- Numerical calculation
- Sample calculation
- Thermal calculations
Motor Calculations

Development of Electromotive Force

A 5-page tutorial detailing the basics of the development of electromotive force including:
- Faraday's law
- The application of Faraday's law
- A single coil DC motor
- Motor constants
Development of Electromotive Force

How to Select a DC Motor

A 4-page tutorial describing the basic calculations and inputs needed to properly size a DC motor including:
- Available voltage
- Output torque required
- Output speed required
- Physical envelope available
- Operating temperature
How to Select a DC Motor

Motor Calculations

A 9-page tutorial detailing the steps needed to properly size and select a DC motor including:
- Calculating the mechanical power requirements
- Torque-speed curves
- Numerical calculation
- Sample calculation
- Thermal calculations
Motor Calculations

Development of Electromotive Force

A 5-page tutorial detailing the basics of the development of electromotive force including:
- Faraday's law
- The application of Faraday's law
- A single coil DC motor
- Motor constants
Development of Electromotive Force

DC Motor Application Considerations

A 4-page tutorial providing guidelines for the selection of DC motors:
- Audible noise
- Electro-magnetic interference
- Motor service life
DC Motor Application Considerations

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