. What is the difference between standard and high response windings?
. How are
the Moog motors thermally protected?
. What is the life of the motor?
. How is the motor lubricated and how often?
. Can the motor be used with air
bearings?
. What cooling options are available
on Moog motors?
. Which servo controllers
and drives work with Moog motors? Does Moog provide control components?
. What voltage drives can be used with Moog motors?
. What type of commutation
signal and sequence do Moog motors with Moog feedback devices have?
. What is the electrical cycle length of a Moog motor?
. Can Moog motors be used
with other manufacturer’s feedback devices?
. What
is a positive direction of a Moog motor?
. How much side load can be applied
to the motor shaft?
. How much torque can
be applied to a motor shaft?
. Can motor shaft rotate?
. Can the motor be used to control force?
. How accurately can the Moog motor control
position?
. How fast can a Moog motor
oscillate a load?
. What is the typical level of friction
in a Moog motor?
What is the difference between standard and high
response windings?
A motor with a standard winding has a higher inductance
with a higher force constant than does a motor with the
high response winding. A standard response motor is used
in systems with large mass and/or in systems that do
not need high precision. A high response winding is used
for high precision and/or highly dynamic motion.
How are the Moog motors thermally protected?
Moog motors have 95° C thermal switches inside
the stator. They are designed to be connected to and
monitored by a control system. If the stator exceeds
the motor’s rated temperature the switches will
open. When the control system observes the open switch
it needs to shut down the motor.
What is the life of the motor?
Moog motors have exceptionally long life when properly
applied and maintained. Endurance testing is being performed
and as of March 2004 has demonstrated life in excess
of 750 million linear inches when run axially loaded
with 100 lbm using a motion profile peaking at 65 inches/sec
over an 8 inch stroke.
How is the motor lubricated and how often?
Follow the Moog Lubrication replenishment procedure
in the Motor
Users Manual.
Can the motor be used with air bearings?
Air bearings may appear to be an attractive alternative
to the present bearing system of the Moog motors. However,
reasonably sized air bearings do not have the lateral
stiffness needed for Moog motors.
What cooling options are available on Moog motors?
Moog motors have convection cooling fins as a standard
feature. A fan cooling option is available on 50204C,
50204D, 50206C, and 50206D motors. A liquid cooling option
is available on 40202C, 40202D, 40204C, 40204D, 40206C
and 40206D motors.
Which servo controllers and drives work with Moog
motors? Does Moog provide control components?
See the Moog list of compatible
control components.
Moog provides integration
packages that include drives,
cables, data files and manuals.
What voltage drives can be used with Moog motors?
Servo drives that use 240 VAC or less are acceptable
for use with Moog motors. Using voltages less than 208
VAC will result in a reduction in performance from the
published peak speed and dynamic response.
What type of commutation signal and sequence do Moog
motors with Moog feedback devices have?
Moog feedback devices mounted on Moog motors provide
digital 120° commutation signals. Motors without Moog
feedback devices do not have commutation signals.
What is the electrical cycle length of a Moog motor?
Electrical cycle of a Moog motor is .922 inches (0.0234
meters).
Can
Moog motors be used with other manufacturer’s
feedback devices?
Yes. Moog motors can be used with many other feedback
devices. However, Moog motors will not supply commutation
signals without a Moog feedback device.
What is a positive direction of a Moog motor?
Moog motors are considered to be moving in a positive
direction when the shaft on the end away from the power
connector is retracting into the motor. See Moog
Motor Users Manual and encoder ICDs for further information.
How much side load can be applied to the motor shaft?
Moog motors are not designed to have an external side
load applied. Any lateral loading of the bearings will
increase wear of the bearings and reduce the life of
the motor. Side loading of the shaft can also cause misalignment
of Moog provided feedback devices.
How much torque can be applied to a motor shaft?
Applying torque to a Moog motor shaft is a problem
only when using an LC type Moog encoder. When the encoder
is being used any applied torque will result in wear
or binding of the internal anti-rotation surfaces and
could eventually result in a loss of feedback signal
as a result of encoder misalignment. On motors without
an LC type Moog encoder the shafts are free to rotate.
Can motor shaft rotate?
Rotating of the Moog motor shaft does not affect the
ability of the motor to produce force. A rotating shaft
motor can only be accomplished with a position feedback
sensor that would allow shaft rotation. The LC type Moog
encoder does not allow rotation. Continuous rotation
of the shaft could decrease the bearing life of the motor.
Can the motor be used to control force?
Moog motors work very well and accurately in a closed
loop force servo system for controlling force. Controlling
force without a closed loop force servo control tends
to yield poor accuracy. It is possible to increase the
accuracy of open loop force control by adding compensation
tables (position, temperature, speed) to the control
loop.
How accurately can the Moog motor control position?
Position accuracy is a function of the design of
the entire servo system (controls, feedback, motor, frame,
load, coupling(s) and etc). The motor is only one of
many components in a servo positioning system and as
such does not have an accuracy associated with it. With
a good control system, a highly accurate feedback
device, a very stiff frame and a very stiff load, Moog
has observed accuracies of better than .0001 inch in
our lab.
How fast can a Moog motor oscillate a load?
The achievable peak frequency depends on the load
mass and the amplitude. See AN-0140 for
some guidelines in comparing motors for this type of
use.
What is the typical level of friction in a Moog motor?
Typically, sliding friction for a motor is less than
4% of the peak thrust specification. Static friction
(stiction) depends on how long the shaft has been stationary
and can be as high as 6% of the peak thrust specification.
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