How do stepper drives and motors get smooth motion?
It is accomplished by ensuring the drive and motor work together, and often by using microstepping. Microstepping is driving the stepper motor such that each pulse does not complete a full step. Rather, a partial step occurs. This allows the motor to operate far more smoothly at lower speeds.
Which is the most basic requirement of a motor?
Since the most basic requirement of a motor is that it should rotate at the desired speed, we will require that the steady-state error of the motor speed be less than 1%. Another performance requirement for our motor is that it must accelerate to its steady-state speed as soon as it turns on.
What is the DC motor speed in steady state?
First consider that our uncompensated motor rotates at 0.1 rad/sec in steady state for an input voltage of 1 Volt (this is demonstrated in the DC Motor Speed: System Analysis page where the system’s open-loop response is simulated).
What are the characteristics of a speed control motor?
AC motor speed control motors generally have the Rotational speed-Torque characteristics shown in Fig. 12. A “Safe-operation line” is included in Fig. 12. The “Safe-operation line” represents the limitation where the motor can perform at continuous duty without exceeding its maximum permissible temperature.
What kind of motor can provide smooth motion at low speed?
Even quite basic CNC machines / 3D printers can achieve movement accuracy of 0.1mm whilst moving a lot faster than 1mm/sec, using very cheap stepper motors & drives. Most of the inaccuracy ends up coming from the play in the drive system (usually lead screws) or flex in the machine body due to mechanical loads.
How does a motor and drive work together?
To accomplish microstepping correctly, the drive and motor must work together. This means the drive must output the correct pulses to the motor, and the motor must be capable of using them. This is usually done by sending current in sine waves to the motor.