Industrial Servo Motor Yaskawa SGMAH Series Ins B SERVO MOTOR
SGMAH-A3AAAG761
QUICK DETAILS
Model SGMAH-A3AAAG761
Product Type AC Servo Motor
Rated Output 30w
Rated Torque0.095 Nm
Rated Speed 3000RPM
Power Supply Voltage 200vAC
Rated Current 0.44Amps
OTHER SUPERIOR PRODUCTS
| Yasakawa Motor, Driver SG- | Mitsubishi Motor HC-,HA- |
| Westinghouse Modules 1C-,5X- | Emerson VE-,KJ- |
| Honeywell TC-,TK- | GE Modules IC - |
| Fanuc motor A0- | Yokogawa transmitter EJA- |
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The open loop gain A is shown for the usual case of an
amplifier/motor combination. You will notice that for every factor
of 10 increase in frequency, the amplitude decreases by a factor of
10. A motor is an integrator. If one puts a constant voltage on the
input, the motor will run continuously, thereby integrating the
position to infinity. If one puts a sine wave alternating signal on
the motor input, it will cycle back and forth to the same velocity
levels, but the position covered during the excursions will vary
dramatically with frequency. The higher the frequency, the less
time for the excursions to the same velocity levels, and the less
distance covered.
Without writing equations, this helps to intuitively explain why A
is graphed as shown. One other
observation that needs to be made for later use is that the
position output lags in phase by 90° from
the signal input.
The excitation sequences for the above drive modes are summarized
in Table 1.
In Microstepping Drive the currents in the windings are
continuously varying to be able to break up one full step into many
smaller discrete steps. More information on microstepping can be
found in the microstepping chapter. Torque vs, Angle
Characteristics
The torque vs angle characteristics of a stepper motor are the
relationship between the displacement of the rotor and the torque
which applied to the rotor shaft when the stepper motor is
energized at its rated voltage. An ideal stepper motor has a
sinusoidal torque vs displacement characteristic as shown in figure
8.
Positions A and C represent stable equilibrium points when no
external force or load is applied to the rotor
shaft. When you apply an external force Ta to the motor shaft you
in essence create an angular displacement, Θa
. This angular displacement, Θa , is referred to as a lead or lag
angle depending on wether the motor is actively accelerating or
decelerating. When the rotor stops with an applied load it will
come to rest at the position defined by this displacement angle.
The motor develops a torque, Ta , in opposition to the applied
external force in order to balance the load. As the load is
increased the displacement angle also increases until it reaches
the maximum holding torque, Th, of the motor. Once Th is exceeded
the motor enters an unstable region. In this region a torque is the
opposite direction is created and the rotor jumps over the unstable
point to the next stable point.
MOTOR SLIP
The rotor in an induction motor can not turn at the synchronous
speed. In order to
induce an EMF in the rotor, the rotor must move slower than the SS.
If the rotor were to
somehow turn at SS, the EMF could not be induced in the rotor and
therefore the rotor
would stop. However, if the rotor stopped or even if it slowed
significantly, an EMF
would once again be induced in the rotor bars and it would begin
rotating at a speed less
than the SS.
The relationship between the rotor speed and the SS is called the
Slip. Typically, the
Slip is expressed as a percentage of the SS. The equation for the
motor Slip is:
2 % S = (SS – RS) X100
SS
Where:
%S = Percent Slip
SS = Synchronous Speed (RPM)
RS = Rotor Speed (RPM)
