Information on phase, pole and stepper motor angle
Generally, stepping motors have two phases, but there are also three-phase and five-phase motors.
Bipolar motors with two phases have one winding/phase, while unipolar motors with one phase have windings with central taps of each phase.
Sometimes stepping motors are called'Four-phase motor'Even if it has only two phases.
Motors with two independent windings per phase can be driven in bipolar or unipolar mode.
The magnetic pole can be defined as one of the regions in the magnetized body with concentrated magnetization.
The rotor and stator of the stepping motor have magnetic poles. The hybrid stepping motor has a toothed rotor.
The rotor is divided into two parts, separated by permanent magnets, half of which are in the South Pole and half of which are in the North Pole.
The extremely correct number is equal to the number of teeth on one of the two half rotors.
Compared with the main pole of the wound winding coil, the stator of the hybrid electric motor also has teeth to form a larger number of equivalent poles (
Smaller pole spacing, equivalent pole number = 360/pitch). For 3. 6 °
Hybrid vehicles usually use 4 main poles, for 1. 8 °And 0. 9 °Hybrid cars usually use 8 main poles.
The following equation shows the number of rotor poles, equivalent to the relationship between stator poles, phase number and the full step angle of a stepping motor. Step angle = 360 /(NPh/Ph)
= 360/N here: NPh = number of equivalent Poles per phase = number of rotor poles Ph = number of phases N = total number of poles of all phases = NPh/Ph if the pitch of rotor and stator are not equal, there are more complex relationships.
Dimensions, in addition to classification by stepping angle, stepping motors are also classified according to frame dimensions corresponding to motor frame dimensions.
For example, the frame size of NEMA 11 stepping motor is about 1. 1 inch (28mm).
Similarly, the frame size of the stepping motor with NEMA size 23 is 2. 3 inch (57mm), And so on.
However, in the same frame size classification, the length of the body may vary from motor to motor.
In general, the available torque of motors of a specific rack size will increase with the increase of body length.
The output torque and power of the torque stepping motor depend on the motor size, motor heat dissipation, duty cycle, motor winding and the type of driver used.
If the stepping motor is operating without load over the entire frequency range, one or more natural oscillation resonance points may be detected through sound or vibration sensors.
The available torque of the stepping motor can be greatly reduced through resonance. Operation at resonant frequency should be avoided.
External damping, increased inertia or micro-step drivers can be used to reduce the influence of resonance.
In a stepping motor, torque is generated when the magnetic flux of the rotor and stator shifts from each other.
The magnetic flux intensity and the corresponding torque are proportional to the number of winding turns and current, and inversely proportional to the length of the magnetic flux path.
With the increase of rotating speed, the time required for current rise accounts for a large part of the interval between stepping pulses.
This will reduce the average current level, so the torque will decrease at higher speeds.
TAG stepper motor angle