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Do I Run a Hard Servo or a Soft Servo? High gain servos have come to be known as hard and low gain servos as soft. The higher the gain (A), the greater the bandwidth (the frequency when A = 1). If one tries to raise the bandwidth too much, the natural frequencies of the machine come into play and eventually instability occurs causing the machine to oscillate indefinitely. In addition, as one increases the bandwidth, the servo tries to force the machine more and more to follow the command. A step input in the command will force the machine to jump. Over time, a machine could be beat to death by an oversized drive system that is forever jerking it back and forth in response to commands. The practical approach is to vary the gain and test the machine's response to a step in command. That response can be viewed on an oscilloscope for number of overshoots or one can rely on gut feel based on how the machine looks when the step occurs. For heavy industry, 1 IPM/MIL (inches per minute per mil of error) is a typical gain. It is unusual for a piece of industrial machinery to get above 5 IPM/MIL.
Phases, Poles and Stepping Angles Usually stepper motors have two phases, but three- and five-phase motors also exist. A bipolar motor with two phases has one winding/phase and a unipolar motor has one winding, with a center tap per phase. Sometimes the unipolar stepper motor is referred to as a “fourphase motor”, even though it only has two phases.
Motors that have two separate windings per phase also exist—these can be driven in either bipolar or unipolar mode.
A pole can be defined as one of the regions in a magnetized body where the magnetic flux density is concentrated.
Both the rotor and the stator of a step motor have poles. Figure 2 contains a simplified picture of a two-phase stepper motor having 2 poles (or 1 pole pairs) for each phase on the stator, and 2 poles (one pole pair) on the rotor. In reality several more poles are added to both the rotor and stator structure in order toincrease the number of steps per revolution of the motor, or in other words to provide a smaller basic (full step) stepping angle. The permanent magnet stepper motor contains an equal number of rotor and stator pole pairs. Typically the PM motor has 12 pole pairs. The stator has 12 pole pairs per phase. The hybrid type stepper motor has a rotor with teeth. The rotor is split into two parts, separated by a permanant magnet—making half of the teeth south poles and half north poles.The number of pole pairs is equal to the number of teeth on one of the rotor halves. The stator of a hybrid motor also has teeth to build up a higher number of equivalent poles (smaller pole pitch, number of equivalent poles = 360/teeth pitch) compared to the main poles, on which the winding coils are wound. Usually 4 main poles are used for 3.6 hybrids and 8 for 1.8- and 0.9-degree types
It is the relationship between the number of rotor poles and the equivalent stator poles, and the number the number of phases that determines the full-step angle of a stepper motor. Step angle=360 ÷ (NPh × Ph)=360/N NPh = Number of equivalent poles per phase = number of rotor poles Ph = Number of phases N = Total number of poles for all phases together If the rotor and stator tooth pitch is unequal, a more-complicated relationship exists
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Importer,Exporter,Trading Company,Seller
Year Established:
2010
Total Annual:
1000000-5000000
Employee Number:
100~120
Ecer Certification：
Verified Supplier
Shenzhen Wisdomlong Technology CO.,LTD Mainly engaged in automation parts, PLCS,DCS,sensors, relays, dirves,encoder, servo drive,soft starter,touch screen,instrument,process control,electric transmission and factory automation aspects of the project design,software programming,technical service and ... Shenzhen Wisdomlong Technology CO.,LTD Mainly engaged in automation parts, PLCS,DCS,sensors, relays, dirves,encoder, servo drive,soft starter,touch screen,instrument,process control,electric transmission and factory automation aspects of the project design,software programming,technical service and ...
