Advanced Motion Controls 12A8 - Motor Specifications

MNALAZIN-02 15
Products and System Requirements / System Requirements
Motor Specifications
AZanalogservodriveshaveagivencurrentandvoltageratinguniquetoeachdrive.Basedon
thenecessaryapplicationrequirementsandtheinformationfromthedatasheetofthemotor
beingused,anAZdrivemaybeselectedthatwillbestsuitthemotorcapabilities.Somegeneral
guidelinesthatareusefulwhenpairinganAZservodrivewithamotor:
• ThemotorcurrentI
M
istherequiredmotorcurrentinampsDC,andisrelatedtothe
torqueneededtomovetheloadbythefollowingequation:
I
M
Torque
K
T
-------------------=
Where:
K
T
‐motortorqueconstant
Themotorcurrentwillneedtobecalculatedforbothcontinuous
andpeakoperation.The
peaktorquewillbeduringtheaccelerationportionofthemoveprofile.Thecontinuous
torqueistheaveragetorquerequiredbythesystemduringthemoveprofile,including
dwelltimes.
• Thesystemvoltagerequirementisbasedonthemotorpropertiesandhowfastandhard
themotorisdriven.Thesystemvoltagerequirementisequaltothemotorvoltage,V
M
,
requiredtoachievethemoveprofile.
V
M
K
E
S
M
⋅()I
M
R
M
⋅()+=
Where:
K
E
‐motorbackEMFconstant
S
M
‐motorspeed(usethemaximumspeedexpectedfortheapplication)
I
M
‐motorcurrent(usethemaximumcurrentexpectedfortheapplication)
R
M
‐motorline‐to‐lineresistance
• ThemotorinductanceisvitaltotheoperationofAZservodrives,asitensuresthattheDC
motorcurrentisproperlyfiltered.
A motor that does not meet the rated minimum inductance
value of the
AZ drive may damage the drive! If the motor inductance value is less
than the minimum required for the selected drive, use of an external filter
card is necessary.
AminimummotorinductanceratingforeachspecificAZdrivecan
befoundinthe
datasheet.Ifthedriveisoperatedbelowthemaximumratedvoltage,theminimumload
inductancerequirementmaybereduced.
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