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installations:nomadicmilk:mechanics:motors

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motors

Gear Head Motor - 7.2vdc 50:1 175rpm (6mm shaft) The motor can be obtained from lynxmotion.

  • Price (USD) [ $21.95 ]
  • Model Number [ GHM-04 ]
  • Ship Weight [ 0.34 lbs. ]

specs

  • Weight = 4.22 oz (119.63 g)
  • Reduction = 50:1
  • Stall Torque = 99.04 oz-in (7.13 kg-cm)
  • Length (motor and gear) = 1.72” (4.37 cm)
  • Length (shaft only) = 0.89” (2.26 cm)
  • Diameter (motor and gear) = 1.45” (3.68 cm)
  • Diameter (shaft) = 6mm
  • Outside Diameter = 37mm
  • Current (at 7.2v no load) = 200mA
  • Current (at 7.2v locked shaft) = 3.80A

The motors came with the lynxmotion frame kit. They have a reduction of 1:50 and have a rear shaft so optical encoders can be mounted for measuring rotational velocity and distance.

datasheet

Encoders

On the rear of the motors, optical incremental encoders have been mounted. These encoders count the revolutions of the motor shaft. For every rotation of a wheel, the motor shaft rotates 50 cycles (due to the 1:50 gear reduction). The encoders give 200 ppr (pulses per rotation).

The encoders have the following connection:

color signal
red +5V
black GND
green pulse A
yellow pulse B
installations/nomadicmilk/mechanics/motors.txt · Last modified: 2010/06/06 13:22 (external edit)