Space-rated frameless TGR Series Zero-cogging motors are specifically designed to match the requirements of reaction wheels for controlling small and miniaturized satellites.

The TGR series space-rated motors are available in two models:

  • TGR 29-12
  • TGR 45-20
TypeMax Speed
[RPM]
Continuous Torque in Atmosphere [Nm]Continuous Torque in Vacuum [Nm]Weight
[kg]
Rotor Inertia [kgm2]Datasheet
TGR 29-126.0000,0120,00360,0313.27e-06
TGR 45-206.0000,0750,0230,1152.05e-05

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TGR series of space-rated zero-cogging motors for reaction wheels

This patented motor architecture has inherent advantages in RWA and flywheel applications: an efficient ironless core, zero cogging stator, high torque capacity, dynamic responsiveness, and overall weight savings.

The “air core” architecture lends itself to very low drag at high operating speeds and cogless torque. The wave-wound design of the stator produces a sinusoidal Back-EMF with total harmonic distortion of less than 1%. The precision hand wound coil results in a phase-to-phase balance within 1 degree. In combination, these produce the highest precision RWA motors available which yields essentially pure torque vector control with very low losses and zero cogging.

The new TGR’s design puts all the magnetics (the heaviest part of the motor) in the rotor, maximizing the inertia for a given weight and size. The resulting package is lighter weight for the same momentum storage capacity, and because of no iron saturation in the stator, the TGR series peak torque capacity is much higher than a similar weight motor. This gives a high dynamic response significantly better than the competition at a lighter weight. The motors are also highly efficient (up to 95%) since the architecture lends itself to very low drag at high operating speeds.

The TGR 29-12’s offers a continuous torque of 0.012 N-m and 0.0054 N-m/√W motor constant. The TGR 45-20 offers a continuous torque of 0.075 N-m and 0.0197 N-m/√W motor constant. This allows the new TGR motor kits to offer more than double the torque of the closest competitor with minimal losses.

Do you have technical questions or need a quote?

Contact us today to talk to an experienced MACCON engineer!

Features of the TGR series space-rated motors

  • High Efficiency: Using slotless, ironless coils made with fine stranded wire, the TGR series of motor kits lends itself to very low drag at high operating speeds, with a significant improvement over traditional iron core slotted motors.
  • High Torque-to-weight ratio: The patented motor topology allows the TGR series to produce up to 12x the amount of torque available from competing motors of an equivalent size.
  • Optimized Rotor Inertia: The motor kit maximizes the inertia for a given weight and size into the rotor. The resulting package is lighter weight for the same momentum storage capacity.
  • Dynamic Response: The TGR series uses a wave-wound coil, which results in a back EMF that is sinusoidal, with a total harmonic distortion of less than 1%. When paired with a sinusoidal drive, torque ripple is minimized and much lower than similar motors.
  • Scalable Design: The TGR series uses a highly scalable design, allowing for modifications to the envelope and output of the motor kits.