Yaskawa 50/60hz 2.2KWatt Input 15.7AMPS SERVO DRIVE SGDB-30ADD-PY8
Quick Details
Description SGDB-30ADD-PY8 is a Drives-AC Servo
Drive Type SGDB AC Servo Drive
Rated Output 2.2kW
Supply Voltage 200V
Model Torque, Speed, Position Control
Applicable motor series SGMG (1500 RPM)
Option Specifications None
Modification None
Power and Torque
ASD's actually control both frequency and voltage simultaneously to maintain a constant volts/hertz ratio which keeps current flow similar to full speed conditions.
This allows the motor to draw full current at any speed and produce full torque as motor speed changes.
What happens to the Horsepower when we lower the speed and torque using frequency?
Reduced Horsepower = Reduced Energy Use = Energy Savings!!!!!!!!!!!
What About INCREASING Speed?
Some specially designed motors meant for use with ASD’s are designed to operate at higher than
normal speeds at frequencies above 60 hertz.
Increasing frequency above 60 hertz makes the motor run faster than normal and creates two primary concerns:
1. Was the motor or the load it drives designed to operate at these increased speeds?
S Many motors and devices were not mechanically balanced to operate at increased speeds and will create vibration, mechanical and safety problems.
2. ASD's are not capable of increasing voltage so as frequency increases above 60 hertz, the torque produced starts to decrease.
_ In order to maintain a constant horsepower output to drive our load, if speed is increased, torque must decrease!
At some point of increased speed we may not be able to produce enough torque to drive the load and at this point, the motor will slow even with increasing frequency.
C This point is different for each manufacturer's motor and dependant on the torque required by the load. Only the manufacturer can help determine when this occurs.
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Younger readers may be unaware of the radical changes that have taken place over the past 40 years, so perhaps a couple of paragraphs are appropriate to put the current scene into perspective. For more than a
century, many different types of motors were developed, and each became closely associated with a particular application. Traction, for example, was seen as the exclusive preserve of the series d.c. motor, whereas the shunt d.c. motor, though outwardly indistinguishable, was seen as being quite unsuited to traction applications. The cage induction motor was (and still is) the most widely used but was judged as being suited only for applications that called for constant speed. The reason for the plethora of motor types was that there was no easy way of varying the supply voltage and/or frequency to obtain speed control, and designers were therefore forced to seek ways of providing speed control within the motor itself. All sorts of ingenious arrangements and interconnections of motor windings were invented, but even the best motors had a limited range of operating characteristics, and all of them required bulky control equipment gear-control, which was manually or electromechanically operated, making it difficult to arrange automatic or remote control.
All this changed from the early 1960s when power electronics began to make an impact. The first major breakthrough came with the thyristor, which provided a relatively cheap, compact and easily controlled
variable-speed drive using the d.c. motor. In the 1970s, the second major breakthrough resulted from the development of power-electronic inverters, providing a three-phase variable-frequency supply for the cage
induction motor and thereby enabling its speed to be controlled.
These major developments resulted in the demise of many of the special motors, leaving the majority of applications in the hands of comparatively few types, and the emphasis has now shifted from
complexity inside the motor to sophistication in supply and control arrangements.
From the user’s point of view this is a mixed blessing. Greater flexibility and superior levels of performance are available, and there are fewer motor types to consider. But if anything more than constant speed
is called for, the user will be faced with the purchase of a complete drive system, consisting of a motor together with its associated power electronics package. To choose wisely requires not only some knowledge of motors, but also the associated power-electronics and the control options that are normally provided.
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