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# Face mask machine stepper motor specifications _60 stepper motor size

by：Zhenyu      2020-09-28
Stepper motor torque calculation method. Choosing a stepper motor, first of all to ensure that the stepper motor output power is greater than the power required to load. When choosing power stepping motor, first to compute the mechanical system of load torque, the torque of the motor frequency characteristics can meet the mechanical load and has a certain margin to ensure its operation.

in the actual work process, various frequency under the load torque must be within the scope of the torque-speed characteristic curve. Generally large static torque of the motor, load torque.

stepper motor torque calculation method, choose stepper motor need to make the following calculation:

is first calculated gear reduction ratio according to the required pulse equivalent, gear reduction than I calculated as follows:

I = ( φ 。 S) / ( 360. Δ ) ( - ) In the type & phi; 推荐- - - - - - Step away from the Angle of step motor ( O/pulse)

S －－- Screw pitch ( mm） Δ 推荐- - - - - - ( Mm/pulse)

stepper planetary gear motor torque calculation method, calculation of workbench, screw and gear convert to the motor shaft of inertia Jt.

jt = J + ( / i2) ( ( J2+Js) +W/g（ S/2π ） 2) （ - 2) Jt - type Convert to the motor shaft of inertia ( 公斤。 厘米。 s2) J、J2 －－- Gear inertia ( 公斤。 厘米。 s2) Js - screw inertia ( 公斤。 厘米。 s2) W－－- The workbench (weight N) 年代- - - Screw pitch ( cm）

stepper motor torque calculation method also need to calculate the total torque of the motor output M

M = Ma + Mf + Mt ( - 3)

Ma=（ Jm + Jt) 。 n / T× 。 02× 0ˉ2 （ - 4) Ma - type Starting and accelerating the motor torque ( N。 m） Jm, Jt - - - - - - Moment of inertia and load inertia of motor itself ( 公斤。 厘米。 s2) n－－- The speed of the motor required to achieve ( r / min) T－－- Machine up time, s）

Mf=( u。 W。 s) / ( 2π η i) × 0ˉ2 （ - 5) Mf - - - Guide rail friction convert to the motor torque ( N。 m） u－－- The coefficient of friction & eta; 推荐- - - - - - Transfer efficiency

Mt = ( Pt. s) / ( 2π η i) × 0ˉ2 （ - 6) 太- - - Cutting force equivalent to the torque of motor ( N。 m） Pt - - - Cutting force ( N)

stepper motor torque calculation method, load start frequency estimation is needed. Numerical control system to control the motor start frequency and load torque and inertia has much to do, the estimation formula for

fq = fq0 [ ( - - - - - - ( 曼氏金融+太) ) /毫升) ÷ ( + Jt / Jm) ] / 2 ( - - - - - - 7) Fq - type With load starting frequency ( Hz） fq0 - - - Ml - no-load starting frequency Under the start frequency is determined by the moment of frequency characteristics of motor output torque ( N。 m）

unable to determine if the load parameters, can according to the estimation of fq fq0 = / 2.

run of high frequency and acc time calculation. Because the output torque of the motor with the increase of frequency decreases, so in high frequency, the torque-speed characteristic in the output torque should be able to drive the load, and had enough allowance.

load torque and big Mmax static torque. Load torque according to type ( - - - - - - 5) Type ( - - - - - - 6) Calculated, when the motor in the feed speed, decided by the torque frequency characteristics of the motor output torque than the sum of Mf and Mt, and the left margin. In general, Mf and Mt should be less than the sum of ( 0. 2 to 0. 4) Mmax。

stepper motor torque calculation method. Choosing a stepper planetary gear motor, first of all to ensure that the stepper motor output power is greater than the power required to load. When choosing power stepping motor, first to compute the mechanical system of load torque, the torque of the planetary gear motor frequency characteristics can meet the mechanical load and has a certain margin to ensure its operation.

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