Power input: This is the voltage that is supplied to the driver. For DC input voltage drivers, this same voltage is usually applied directly to the motor windings. Driver type: This states what type of driver was used to create the curve. Either a unipolar or bipolar driver should be shown. The driver type will also states if the driver is of the constant current or constant voltage type. Damper use: While not required, a damper can help to create a more typical performance curve by representing an inertial load on the motor.
The curve should state if a damper was used and what its characteristics are. Step angle: This is the step angle the motor was driven at when creating the curve. Curves will commonly show what the basic step angle 1. Motor winding configuration: This describes how the motor was connected to the driver and what current was applied to the windings. Motor connections could be unipolar, bipolar series, bipolar half coil and bipolar parallel. Torque units: The vertical axis shows the amount of torque and in what units e.
Speed: The horizontal axis shows the shaft speed of the motor and in what units e. Maximum No-load starting speed: The maximum no-load starting speed is the maximum speed at which the motor can be started in synchronism with no load attached and no acceleration used.
Holding Torque: This is the torque that the motor will produce when the motor is at rest and rated current is applied to the windings. Pull-out Torque curve: This curve represents the maximum torque that the stepper motor can supply to a load at any given speed.
Any torque or speed required that exceeds goes above this curve will cause the motor to lose synchronism. Pull-in Torque curve no load : This curve represents the maximum torque and speed combination that an unloaded stepper motor can start or stop without any acceleration or deceleration.
Since the pull-in torque curve for a stepper motor varies depends on the inertial load attached to the motor, the pull-in torque curves are not shown in the speed — torque curves shown in catalogs. In order to operate above the pull-in torque curve, the motor must be accelerated into or decelerated out of the slew range. Pull-in Torque curve inertial load : This curve represents the maximum torque and speed combination that a stepper motor with an inertial load i.
A higher pulse rate higher pulse frequency causes the speed of stepper motor rotation to increase proportionally. This characteristic of motor rotation being perfectly synchronized with the pulse rate is what makes stepper motors appealing. On the other hand, loss of synchronization between input pulses and motor rotation can occur due to overloading or sudden changes in speed.
The former instantly changes speed of motor rotation. Also called the rectangular motion profile, this mode is restricted to the operating range within which the motor is able to self-start get up to speed immediately. If sufficient torque is available for this acceleration, this mode is very simple with a constant rate of pulses.
If sufficient acceleration torque cannot be generated, however, the result is a loss of synchronization. This involves the gradual changing of pulse rate to provide time for acceleration and deceleration. Also called the trapezoidal motion profile, this mode expands the operating range beyond which the motor can self-start. However, because sudden acceleration or deceleration risks a loss of synchronization, care must be taken when determining how to change the motor speed pulse rate up and down.
Constant velocity motion profile rectangular motion profile. Stepper motors rotate in fixed steps. They use open-loop control, and are operated by having a controller generate pulses that are input to a driver, which in turn supplies the drive current to the motor.
Stepper motors are controlled by input of electrical pulses, such that the speed of motor rotation is proportional to the input pulse rate. As speed control of these motors are an important factor to consider in order to avoid problems such as loss of synchronization, it is essential to have a good understanding of how they are controlled.
ASPINA supplies not only standalone stepper motors, but also system products that incorporate drive and control systems as well as mechanical design. These are backed by comprehensive support that extends from prototyping to commercial production and after-sales service.
ASPINA can offer solutions that are tailored to suit the functions and performance demanded by a diverse range of industries, applications, and customer products, as well as your particular production arrangements. ASPINA supports not only customers who already know their requirements or specifications, but also those who are facing problems at early stages of development.
Do you struggle with the following concerns? How does an electronic speed controller for a brushless DC motor work? And what should you consider when you choose the right one? Small brushless motors. Difference between brushed motor and brushless motor. Bipolar Stepper Motor In bipolar stepper motors, current can flow in both directions; a full-bridge converter is required to drive each of the two windings of a two-phase motor. During motion, the type of electronic control full step, half step, microstepping and the re.
In unipolar stepper motors, stator windings share a common terminal; the free terminal of each winding is connected to a separate power switch and the current is allowed to flow in one direction through the motor windings. Diodes are used to clamp th. All resources. Download 0. AN Stepper motor driving. AN Stepper motor driving 2. Load more. An introduction to electric motors.
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