| SGMAH-01A1A21 |
| SGMAH-01A1A2B |
| SGMAH-01A1A2C |
| SGMAH-01A1A41 |
| SGMAH-01A1A4B |
| SGMAH-01A1A4C |
| SGMAH-01A1A61D-OY |
| SGMAH-01A1A-AD11 |
| SGMAH-01A1A-FJ61 |
| SGMAH-01A1A-SM11 |
| SGMAH-01A1A-SM21 |
| SGMAH-01AAA21 |
| SGMAH-01AAA21-Y2 |
| SGMAH-01AAA2B |
| SGMAH-01AAA2C |
| SGMAH-01AAA41 |
| SGMAH-01AAA4B |
| SGMAH-01AAA4C |
| SGMAH-01AAA4CH |
| SGMAH-01AAA61 |
| SGMAH-01AAA61D-OY |
| SGMAH-01AAACH |
| SGMAH-01AAAG761 +SGDM-01ADA |
| SGMAH-01AAAH12C |
| SGMAH-01AAAH161 |
| SGMAH-01AAAH161-E |
| SGMAH-01ACA-SW11 |
| SGMAH-01B1A2S |
| SGMAH-01B1A41 |
| SGMAH-01BAA21 |
| SGMAH-01BAA41 |
| SGMAH-01BBA21 |
| SGMAH-01BBABC |
| SGMAH-01BBA-TH12 |
| SGMAH-02A1A21 |
| SGMAH-02A1A61D-0Y |
| SGMAH-02A1A6B |
| SGMAH-02A1A6C |
| SGMAH-02A1A-DH12 |
| SGMAH-02A1A-DH21 |
| SGMAH-02A1AG161 |
| SGMAH-02A1A-SM11 |
| SGMAH-02A1A-SM21 |
| SGMAH-02A1A-YR21 |
| SGMAH-02AAA21 |
| SGMAH-02AAA21/SGMAH-02AAA41 |
| SGMAH-02AAA21-Y1 |
| SGMAH-02AAA2B |
| SGMAH-02AAA2C |
| SGMAH-02AAA2C-Y2 |
| SGMAH-02AAA41 |
| SGMAH-02AAA4C |
| SGMAH-02AAA61D-OY |
| SGMAH-02AAA61D-YO |
| SGMAH-02AAA6C |
| SGMAH-02AAA6CD-0Y |
| SGMAH-02AAA6SD |
| SGMAH-02AAAG761 |
| SGMAH-02AAAGB61 |
| SGMAH-02AAAH161 |
| SGMAH-02AAAH76B |
| SGMAH-02AAAHB61 |
| SGMAH-02AAAJ32C |
| SGMAH-02AAAJ361 |
| SGMAH-02AAA-SB12 |
| SGMAH-02AAAYU21 |
| SGMAH-02AAF4C |
| SGMAH-02ABA21 |
| SGMAH-02ACA-SW11 |
| SGMAH-02B1A21 |
| SGMAH-02B1A2C |
| SGMAH-02B1A41 |
| SGMAH-02B1A6C |
| SGMAH-02BAA21 |
| SGMAH-02BAA41 |
| SGMAH-02BAAG721 |
| SGMAH-02BBA21 |
| SGMAH-03BBA-TH11 |
| SGMAH-04A1A2 |
| SGMAH-04A1A21 |
| SGMAH-04A1A2B |
National Electrical Code Procedures
Use the NEC motor current tables to find the design Full Load
Current or FLA (adjusted for Service Factor) unless it is not
available.
C For Single Phase Motors: Use NEC Table 430-148
C For Three Phase Motors: Use NEC Table 430-150
• These values are about 10% higher than what a typical motor would
draw at full load to allow for bearing wear in the motor and load,
etc.
C The values in the NEC tables will allow for replacement of the
motor in the future without having to replace the circuit
conductors or overcurrent devices.
Types of Overcurrent Devices - NEC TABLE 430-152
Selection of the size of the overcurrent protection device is made
using NEC Table 430-152 which lists information for four types of
devices:
1) Standard (non-time delay) Fuses 2) Time-Delay (dual element)
Fuses
3) Instantaneous Trip Circuit Breaker 4) Inverse Time Circuit
Breaker
• The table is used to size the device above normal starting
current levels of most motors allowing them to start and run
without tripping the overcurrent protection device.
Differential Term
The Integral and Proportional terms have provided a system which is
considerably more accurate and responsive at lower frequencies, yet
stable based on the phase margin criterion near servo bandwidth
frequencies. It may also be desirable to further improve the phase
margin so that the bandwidth can be extended or the overshoot of
the step response minimized.
This is possible by introducing positive phase to improve the phase
margin by means of a Differentiator. Earlier it was mentioned that
an Integrator results in the output lagging the input by 90°.
Conversely, a
Differentiator has an output that leads the input by 90°. An
Integrator, with frequency, takes the form of (KI/ω)∠-90° with its
gain decreasing with frequency and its output having a 90° phase
lag. A Differentiator takes the form KDω∠+90° with its gain
increasing with frequency, but its output having a 90° phase lead.
By designing the Differentiator so that it is effective for
frequencies of 10 radc. and above in the example, the phase lead
will benefit the phase margin near the bandwidth frequencies. There
is an undesirable effect from this, however. Since the
Differentiator causes the gain to increase with frequency, it also
increases some of the machine resonances that will often be found
in the 100 to 1,000 radc. range. For this reason,the Differentiator
is usually "disengaged" back to Proportional at some midpoint
between the servo bandwidth and the frequency of the first
resonance.
Coils and Phases
A stepper motor may have any number of coils. But these are
connected in groups called "phases". All the coils in a phase are
energized together.
Unipolar vs. Bipolar
Unipolar drivers, always energize the phases in the same way. One
lead, the "common" lead, will always be negative.
The other lead will always be positive. Unipolar drivers can be
implemented with simple transistor circuitry. Thedisadvantage is
that there is less available torque because only half of the coils
can be energized at a time.
Bipolar drivers use H-bridge circuitry to actually reverse the
current flow through the phases. By energizing the phaseswith
alternating the polarity, all the coils can be put to work turning
the motor.
A two phase bipolar motor has 2 groups of coils. A 4 phase unipolar
motor has 4. A 2-phase bipolar motor will have 4wires - 2 for each
phase. Some motors come with flexible wiring that allows you to run
the motor as either bipolar orunipolar.
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- |
Contact person: Anna
E-mail: wisdomlongkeji@163.com
Cellphone: +0086-13534205279
