What is the maximum speed that a step motor can achieve?
The speed of the rotor is higher than the speed of the rotor's rotating field. Are above the 0.02 S, for example, charging time constant pulse frequency is low, the stator coil charging fully, its produce torque is big, if the motor load lighter, will more than should be in the balance of rotor position, stator rotor magnetic field and to pull back to the equilibrium position, when the same back to the equilibrium position and the across the equilibrium position and equilibrium position behind, just under a pulse arrives at this time, so the rotor in the equilibrium position behind the place to start a new step. This cycle also causes each step to be left behind in the balance position that should be reached, and is further and further away from the balance. The accumulated result is a lost step. Solution: 1. Increase pulse frequency 2, do not want to be too high speed, then reduce step motor power supply current. 3, neither of them can adjust, change torque small motor.
Stepper motor speed is proportional to the pulse frequency, the pulse frequency, the higher the stepper motor speed also, but increases the pulse frequency although reached the acceleration effect, has lost moment. Torque increases with pulse frequency and the cause of the decline: stepper motor step out of the two reasons: one, the control pulse frequency is high, the rotor of the acceleration is less than the speed of the stepper motor stator rotating magnetic field. The stepper motor power supply design, the stator coil electric time constant is basic fixed, assumes that the time constant is 0.02 S (0.02 S charging to a maximum of 63%), if the stepper motor to accept pulse cycle is greater than 0.04 S (duty ratio is 50%, the frequency is less than 25 hz), of the stator coil which can gain enough energy to produce enough to drive the rotor torque. If the pulse frequency is too high, such as 50 hz (duty ratio is 50%, more than 0.02 S) pulse cycle, the stator coil for the charging time of just 0.01 S, about half of charging time, the torque is reduced a lot, the rotor can't keep up with the speed of the stator rotating magnetic field, each step behind the equilibrium position should be arrived, and farther and farther away from the equilibrium position. Creates a out-of-step accumulated results. 50 hz frequency is too small, of course, this example is just for illustration purposes, casual said a number of solutions: 1, to reduce the pulse frequency, don't think that trouble, most debugging step motor is the process of adjusting the pulse frequency
Stepper motor can run under no-load condition 3000 RPM, but at this time of the output torque is very small, there is no application value, for a specific design, stepper motor can run, high main reference step torque frequency curve, as long as the motor output torque can meet the application requirements, high speed can be as much as possible. In addition, it is important to consider whether or not the bearings are suitable for high speed.
The control pulse frequency is high, the acceleration of the rotor is less than the speed of the stator rotating field of the motor stator. The stepper motor power supply design, the stator coil electric time constant is basic fixed, assumes that the time constant is 0.02 S (0.02 S charging to a maximum of 63%), if the stepper motor to accept pulse cycle is greater than 0.04 S (duty ratio is 50%, the frequency is less than 25 hz), of the stator coil which can gain enough energy to produce enough to drive the rotor torque. If the pulse frequency is too high, such as 50 hz (duty ratio is 50%, more than 0.02 S) pulse cycle, the stator coil for the charging time of just 0.01 S, about half of charging time, the torque is reduced a lot, the rotor can't keep up with the speed of the stator rotating magnetic field, each step behind the equilibrium position should be arrived, and farther and farther away from the equilibrium position. The accumulated result is a lost step. 50 hz frequency is too small, of course, this example is just for illustration purposes, casual said a number of solutions: 1, to reduce the pulse frequency, don't think that trouble, most debugging step motor is the process of adjusting the pulse frequency If you don't want to cause low speed by reducing the frequency, then step up the electrical current in the motor Reduce the load on the motor
