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Linear Stepper Motor

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Linear stepper motor manufacturer

HOLRY Linear Technologies lead screw stepper motor linear actuators feature heavy-duty ball bearings to maximize their thrust. Our lead screws are securely press-fitted into the motor’s rotor to allow a smaller footprint, while minimizing backlash and providing years of dependable life. Our stepper motor linear actuators are available in captive, non-captive, external and ball screw linear actuator configurations. Optional available accessories include connectors, wire harnesses, encoders, and custom lead screw nuts.

Linear stepper motors are devices that use a stepper motor to create linear motion. They are commonly used in automation, robotics, and other applications that require precise and controlled linear movement.
The stepper motor inside the actuator consists of a rotor and stator, which work together to generate rotational motion. The linear motion is achieved by converting this rotational motion into linear motion through the use of a lead screw or other mechanism.
Stepper motor linear actuators are typically used in applications where accuracy and precision are critical, such as in laboratory equipment, medical devices, and manufacturing machinery. They offer a high degree of control over movement and can be programmed to move in very precise increments.
There are different types of stepper motor linear actuators, including captive, non-captive, and external linear actuators. Captive actuators have a fixed shaft, while non-captive actuators have a rotating shaft. External actuators use a separate lead screw or other mechanism to convert the rotational motion of the motor into linear motion.
Overall, stepper motor linear actuators are a versatile and reliable option for creating precise linear motion in a variety of applications.

Video of linear stepper motor

Linear stepper motor working principle

The "Linear Stepper Motor" has been widely used, but not as a general stepper motor DC motor, AC motor use in practice. It must only constitute a control system using the dual-ring pulse signal, power driver circuit. Thus stepping motor with good but not easy, it involves a lot of expertise in mechanical, electrical, electronic and computer. Stepper motor as the performance element, it is one of the key commodity mechatronics, widely used in a variety of automated control systems. Conduct follow microelectronics and computer technology, the demand for stepper motor over time, has used in various fields of national economy. Stepper motor control can only be operated by a digital signal, pulses stepper drives, in a short time, the control system announced a few too many pulses, that is, the pulse frequency is too high, will cause the stepper motor stall.

To resolve this question, it is necessary to choose the acceleration and deceleration of the way. In other words, in the stepping motor at the start, gradually rising to give the pulse frequency, pulse frequency demand deceleration gradually reduced. That is, we often say that the "deceleration" approach. "Linear Stepper Motor" transfer rate, is based on changing the input pulse signal to the changes. Theoretically, to drive a pulse, the stepper motor is rotated by one step angle (broken when a subdivision step angle). In fact, if the pulse signal changes too fast, because the damping effect of the stepping motor inside the counter electromotive force, the magnetic reaction between the rotor and the stator will not follow the change in the electrical signal, will cause stall and lose steps.

Types of Linear Stepper Motor

External Lead Screw Linear Actuators、Non-Captive Lead Screw Linear Actuator、Ball Screw Linear Actuators、Captive Lead Screw Linear Actuator

1.External Lead Screw Linear Actuators:

The lead screws of the external linear stepper motors are integrated with the motor rotor as a part. It has an external drive nut that can be mounted to a carriage assembly. Linear motion is created by the nut traversing back and forth on the lead screw as it turns. The common end feature of the screw is a bearing journal. External linear stepper motors are most akin to motorized rails where the nut is replaced by a driven carriage assembly.

2.Non-Captive Lead Screw Linear Actuator:

The nuts of the non-captive linear stepper motors are integrated with the rotor. The lead screw can go through the motor or be completely separated from the motor as a part. It has no reasonable stroke limits but the shaft must be attached to an assembly that will not rotate. This will then allow the lead screw to extend and retract without rotating, travel freely in and out of the motor body. In certain setups the motor body may serve as the drive or the nut in the assembly. The anti-rotation is by the attachments point and is commonly a cut or machine thread on the end of the screw. The non-captive is potentially the shortest overall length assembly.

3.Ball Screw Linear Actuators:

Ball screws and lead screws are used for different applications and are often not interchangeable. Both have alternate advantages and disadvantages. If you compare a ball screw and lead screw design yourself, the first thing you might notice is that they are designed to carry loads differently. The way ball screws move a load is through recirculating ball bearings to maximize efficiency and minimize friction. A lead screw relies on the amount of friction between surfaces to be low compared to the amount of pressure being applied. That means that a lead screw does not have the same capability to be as efficient as a ball screw. They also provide linear actuators with better performance or faster speeds, depending on which design model you choose.

4.Captive Lead Screw Linear Actuator:

In a captive linear actuator design, the lead screw is connected to a spline shaft that passes through a spline bushing to keep it from rotating. The spline bushing prevents the lead screw from rotating but allows enough clearance for the shaft to move axially as the lead screw is driven back and forth with a corresponding clockwise and counterclockwise turn of the motor. The anti-rotation feature is inherent in the design and creates a stand-alone unit that pushes and pulls whatever device to which it is attached. Because it is independent, this type of actuator can also provide a push force without being attached to anything. For this reason, it's an excellent choice for packaging applications or push-button applications where the return motion is handled by a spring pre-load or influenced by gravity.
Valves used to control the flow of liquids are excellent applications for this product because the captive actuators can easily open and close them with speed control and accuracy. Captive actuators can also be used to control airflow in HVAC systems with automated dampers in the ductwork. They work particularly well due to their quiet operation, compact size, and ability to function in dusty/dirty environments.

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Changzhou Holry Electric Technology Co., Ltd. specializes in the development and production of stepper motors, hybrid stepper motor, CNC machine motor, screw motor, spindle motors, air cooled spindle, brushless motors, stepper motor screwstepper motor gearbox, servo motors and drive systems.


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