Embroidery machine is also known as the computer embroidery machine, it is the most advanced contemporary embroidery machinery, it can make the traditional manual embroidery to get high speed, high efficiency of the realization, and also can achieve manual embroidery can not achieve the "multi-level, multi-function, unity and perfection" requirements. It is a kind of electromechanical products reflecting a variety of high and new technology. As the computer embroidery will replace the manual embroidery, the computer embroidery machine will also become the major machine type in the embroidery industry.
Embroidery machine stepping motor has three elements of step Angle (involving phase number), static torque, and current. Once the three elements are determined, the model of the embroidery machine stepping motor will be determined.
1. Selection of step distance Angle. The step distance angle of the motor depends on the accuracy of the load. Converts the small zui resolution (equivalent) of the load to the motor shaft. How many angles (including deceleration) that each equivalent motor should take. The step distance angle of the motor shall be equal to or less than this angle. At present, the stepping Angle of embroidery machine stepping motor on the market is generally 0.36 degrees / 0.72 degrees (five phase motor), 0.9 degrees / 1.8 degrees (two, four phase motor), 1.5 degrees / 3 degrees (three phase motor).
2. The selection of the static moment. The dynamic moment of the motor is difficult to determine, we often determine the static torque of the motor first. The static moment is selected based on the load of the motor operation, which can be divided into inertia load and friction load. A single inertial load and a single friction load do not exist. When direct start (generally by low speed), both loads should be considered, accelerated start mainly consider the inertial load, constant speed operation as long as consider the friction load. Generally, the static moment should be within 2-3 times of the friction load. Once the static moment is selected, the seat and length of the motor can be determined (geometric size).
3. Selection of electric current. For the same static moment motor, due to different current parameters, its operating characteristics are very different. You can judge the current of the motor according to the torque frequency characteristic curve diagram (with reference to the drive power supply and drive voltage). In conclusion, the selection of the motor should generally follow the following steps.
Moment and power conversion. Embroidery machine stepping motor is generally used in a large range of speed regulation, its power is changed, generally only measured by the torque, the torque and power conversion is as follows:
p=ω·m，ω=2π·n/60，p=2πnm/60
Its p is in power in watt, angular speed per second, unit in radian, n is rotational speed per minute, m is in torque in Newton meter p=2 fm / 400 (half-step work) where f is the number of pulses per second (pps for short).
