Table of Contents
Can we control the torque of a stepper motor?
Torque in a motor depends on current going through the motor’s coils. Therefore, the common and logical way to control this torque is to perform a current regulation by monitoring it directly. This method is called the current mode control.
How do stepper motors vary torque?
Torque / Speed Curves To increase torque by 20%, increase the current by about 20%. To decrease the torque by 50%, reduce the current by 50%. Because of magnetic saturation, there is no advantage to increasing the current to more than 2 times the rated current and doing so may damage the motor.
What is dynamic torque in stepper motor?
Also referred to as “running torque” or “dynamic torque,” pull-out torque is the maximum load (torque) a stepper motor can produce while it’s rotating, without losing steps. If operated at a point beyond the pull-out torque curve, the motor can stall.
How do you get more torque out of a stepper motor?
The available torque from a stepper motor falls off sharply as speed increases. The maximum torque is available when the motor is stationary. Using a higher motor power supply voltage will improve torque at higher speeds.
Is higher torque holding better?
The momentum of the moving rotor is countered by the detent torque, along with friction in the rotating components. Therefore, a higher detent torque will help the motor stop more quickly. Detent torque typically ranges from 5 to 20 percent of the motor’s holding torque.
How does a variable reluctance stepper motor work?
Principle. The fundamental variable reluctance stepper motor working principle is that it is dependent on multiple reluctance locations of the rotor device. When the stator phases receive the voltage signal and get excites, there will be the creation of a magnetic field whose axis lines are across the poles.
What is the difference between holding torque and detent torque?
The torque which is caused by the motor when the rated current flow across the winding is known as the holding torque. Detent torque is beneficial for stopping the motor. It also resists the momentum of the moving rotor and the friction in the rotating components.
Does voltage affect stepper motor torque?
Another factor which limits the torque output of stepper motors at high speed is the rate of increase of current in the windings (dI/dt), which is directly proportional to the applied voltage (V) and inversely proportional to the motor inductance (L).
Why do stepper motors have high torque?
Supplying a higher voltage to the motor windings drives the torque/speed curve higher, and thus produces higher torque at higher speeds.
Which torque is highest in stepper motor?
When choosing a stepper motor, it is important to understand four torque characteristics: Pull-out torque is the maximum torque that can be delivered without losing steps. It reaches its maximum at the lowest frequency or speed, and decreases as frequency increases.
What is variable stepper motor?
The principle of Variable Reluctance Stepper Motor is based on the property of the flux lines which capture the low reluctance path. The stator and the rotor of the motor are aligned in such a way that the magnetic reluctance is minimum.
What is the difference between a conventional stepper motor and a variable reluctance stepper motor?
Switched reluctance motors have fewer poles and a larger stepping angle than stepper motors. While stepper motors are typically chosen for positioning applications, where step integrity and high resolution are important, switched reluctance motors are used in applications where power density is a primary concern.
What is variable reluctance stepper motor?
A variable reluctance stepper motor is an electromechanical energy conversion device that converts electrical energy to mechanical energy. It works on the principle of reluctance, according to which magnetic flux always flows through a minimum reluctance path.
What is the principle of variable reluctance stepper motor?
How much speed can you get with a stepper motor?
With input frequency of 1000hz, . 72 / 360 * 1000 * 60 = 120 rpm. How fast can stepper motors go? Generally speaking the top speed of a stepper motor is approximately 1000rpm. The exact speeds that are possible depend on the specific motor being used and the controller being used with it.
What is stepper motor type best for high torque?
Low cost for control achieved
How strong of a stepper motor do I Need?
While the size of a stepper motor generally dictates the low speed torque, the ability of the drive electronics to force current through the windings of the motor dictates the high speed torque.
How accurate is a stepper motor?
Steppers provide precise positioning and repeatability of movement since good stepper motors have an accuracy of 3 – 5% of a step and this error is non-cumulative from one step to the next. 8. Stepper Motors are Overload Safe. The Stepper Motor is essentially overload safe.