24 Volt DC Servo Motor with 500 line encoder
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This DC servomotor is 4.1" long overall, 1.55" diameter at the
head, 2" diameter at the encoder cover. The 0.156" diameter
output shaft is 0.85" long, has a 0.5" long flat, and runs in shielded
ball bearings.
Specs:
Weight = 12.7 oz
Voltage = 24VDC
No load speed = 5984 rpm
Torque constant = 3.8 Ntm/A
Voltage constant = 4.0 mV/rpm
Speed regulation constant = 250 rpm/Ntm
Motor constant = 1.9 Ntm/SqrW
Stall torque = 24 Mtm
Stall current = 6.3 A
No load current = 0.157 A
Terminal resistance = 3.8 ohms
Terminal inductance = 2.6 mHy
Electrical time constant = 0.75 msec
Mechanical time constant = 11.5 msec
Rotor moment of inertia = 20 gcm2
Under the black cover, there is a 500 line encoder wheel
and a HP HEDS-9100 encoder. This combination yields 2000 counts
per revolution with 4X quadrature counting. The HEDS-9100 is
good for 100 Khz (12,000 rpm with the 500 line wheel - probably
beyond the top speed of the motor), has TTL outputs and runs on
5VDC, so no encoder signal conditioning board is necessary.
HEDS-9100 Data sheet is here...
The quadrature output allows precise motor speed and position control
with appropriate drive electronics, with a position accuracy approaching
1/2000th of a revolution. Even if run open loop, the encoder output can be
used for DSS or DRO display.
These are new surplus motors from a plotter manufacturer, and the cost
is much less than the price of the HEDS-9100 encoder alone!
Inside...
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