1 What are the material for the screw and nut?
Unless otherwise specified, all the screws of our company are made of 303 precision cold-rolled stainless steel, and the nuts are made of engineering plastics (polyacetal resin).
2 What are the benefits of Teflon coating？
It can increase the life of the nut three to four times, reduce the friction coefficient between the nut and the screw from 0.15 to 0.09, increase the transmission efficiency from 10% to 20%, increase the surface finish and reduce the noise. Teflon coating has the above benefits, so it can be applied to harsh environments, clean rooms and brushing applications.
3 Can the lead screw be used in a clean room?
It depends on what level of clean room the screw is using. Most screw rods can be used in clean rooms of class 1000 without modification. Teflon coating is designed specifically for this type of environment.
4 Can the screw and nut be used in a vacuum environment?
It depends on the system requirements. The weight reduction of standard acetal materials in a certain temperature and vacuum environment over the entire time is useful. Our company can customize all kinds of materials to make nuts. We can use well known materials that can be applied by application and ensure compatibility.
The self-locking force of the screw refers to the ability of the screw to be rotated by the thrust acting on the nut. When the lead angle of the lead screw is greater than the equivalent friction angle, the self-locking force can take effect. Since this is very difficult to measure, a useful empirical estimation method is when the lead of the unlubricated screw is greater than one-third of the diameter, the screw pair is self-locking. Lubricated one is a quarter.
6 Can the nut assembly be used in harsh environments?
Since the screw does not have any rolling elements, the requirements for dust and dirt are relatively loose. It is allowed to use in paper processing, wood and metal processing, engraving machines and food processing environments.
7 What is life cycle of screw nut assembly?
For anti-backlash nuts, life time refers to the failure of the nut clearance compensation ability. For ordinary nuts, it means that the load cannot be pushed or the accuracy requirements of the system cannot be reached. Using different forms of nuts can improve life time.
8 What is the standard operating temperature of the component?
The standard operating temperature is 0~90 degrees. For applications where the temperature is higher or lower than this range, other materials need to be used.
9 what is the straightness of the screw?
According to different diameters and lengths, we can control the straightness as 0.15mm/300mm.
10 What is the maximum speed that the screw can reach?
The maximum speed can refer to the critical speed table. This is based on the screw diameter, supported end bearing and unsupported screw length, there are corresponding charts on our website or catalogue.
11 What is the design load rating of the nut?
The design load rating of the nut refers to the axial load on the nut during work. The maximum load force includes the mass of the pushing load and the influence of acceleration and deceleration needs to be considered. The design load rating is related to the life of the nut, backlash and wear compensation.
12 How big is the backlash between the nut and the screw? Is there any method to reduce this gap?
Generally, the backlash between screw and nut is 0.01mm~0.1mm. The best way to eliminate backlash is to use our series of screws with anti-backlash function.
13 Does the screw need lubrication？
The screw has been coated with special grease before shipping, so there is no need to add lubricating grease again during use. When installation, pay attention to protect the grease from being wiped off, and it is forbidden to apply lubricating grease not provided by the factory.
1 What is a linear stepper motor？
A linear stepping motor is a device that generates force and movement through a straight line. The linear stepper motor uses a stepper motor as the source of rotation power. Inside the rotor, there is a threaded precision nut instead of the shaft. The shaft is replaced by a screw.
When the rotor rotates (as in a traditional stepper motor), the linear movement is achieved directly through the nut and threaded screw. The conversion from rotating to linear is directly completed inside the motor, which greatly simplifies the design of rotating to linear applications. This makes ideal high resolution and accuracy for applications that require precise motion.
Over the years, stepper motors have been widely used in various fields. With the trend of miniaturization, computer control and cost reduction, the application range of hybrid linear stepping motors is gradually expanding.
Especially in recent years, the application field of linear stepper motors has expanded rapidly. These precise and reliable motors can be used in many equipments, such as blood analyzers and other medical instruments, automatic stage lighting, imaging equipment, HVAC equipment, valve control, printing equipment, X-Y stages, integrated chip manufacturing, inspection and testing equipment. This attractive technical solution does not require the use of a large number of components, saves costs related to assembly, procurement, and inventory, and is suitable for almost all applications.
2 The difference between Kaptive (Captive), Non-Captive and External linear actuator
The shaft sleeve and spline mechanism or guide rail profile installed on the fixed axis motor enable the motor to directly output linear motion without the need for an external rotation stop mechanism. The design stroke of the fixed axis motor is relatively short.
The through-shaft motor is a screw through the motor, there is no stroke limit, but it must be equipped with an external anti-rotation mechanism, so that the screw can stretch back and forth without rotating movement.
The external drive motor uses a screw and nut to extend at one end of the motor. The nut is driven by the rotation of the screw to achieve linear movement (the motor also needs to be equipped with an external anti-rotation mechanism)
3 Does the screw of non-captive linear actuator rotates?
It does not. Once one end of the screw is connected to the anti-rotation mechanism that needs to be moved, it will move back and forth without rotating. The through-axis motor can be used for long-stroke applications.
4 Has your motor been approved by UL, CSA, CE and other institutions?
The low operation voltage of the motor makes it unnecessary for UL, CSA, CE and other related certifications. But many customers who use our motors have finally passed these certifications for the entire product system.
5 This motor vibrates a lot in my application, what measures do I use to reduce the vibration?
This may be resonance. The resonance frequency range of permanent magnet motors is 75~90PPS, and the resonance frequency range of hybrid motors is 140~200PPS. Try to start accelerating above these frequencies, or micro stepping function.
6 The difference between standard linear stepper motor and high-resolution linear stepper motor
The step angle of high-resolution motors is smaller. The step angle of the high-resolution permanent magnet linear stepping motor is 3.75 degrees, and the high-resolution hybrid linear stepping motor is 0.9 degrees. Standard permanent magnet linear stepper motor is 7.5 degrees, hybrid linear stepper motor is 1.8 degrees.
7 When used for positioning, does the stepper motor need a position feedback mechanism?
The stepper motor is an open-loop actuator without feedback. But it can be equipped with encoder when precise positioning is required.
8 What is the difference between a uni-polar motor and a bi-polar motor?
Under the same input power, the output torque or thrust of the bipolar motor is about 30% higher than that of the unipolar motor, and the bipolar motor is usually a customized motor.
9 What is the difference between 4-wire and 6-wire motor?
The 4-wire motor is bipolar and has 2 windings. During operation, the 2 windings will be switched on at a given time, and rotation is achieved by changing the current in the coil. 6-wires are unipolar, there are 4 windings, and there is a common lead in each phase winding.
10 What is static torque and output torque?
The static torque is the total torque that the motor can overcome when starting at a standstill. The output torque is the torque when the motor is running at a certain speed.
11 Can I stop the motor immediately?
For fine-threaded motors, we do not recommend you to do this, because the force generated may cause the motor to jam. However, it is allowed to be carried out with reduced power input.
12 Do we need to re-lubricate the screw or shaft of the linear stepper motor?
The linear stepper motor has been lubricated before shipping and does not need to be relubricated under normal operating conditions.
13 Will the screw fall by itself when the motor is powered off?
This depends on the lead size of the screw you are using. A screw with a small lead and self-locking function will not fall, and a screw with a larger lead may fall without self-locking function！
No, if the rotor is now stopped between the two poles, it will be even worse. Adding an encoder can improve the accuracy. Torque or thrust will be reduced by about 20% to 30%.
You can increase the voltage to two times when driving with constant voltage, and when driving with 2 times current and constant current, but the premise is that it must be 25% working.
It is normal for the motor to allow a temperature rise of up to 75 degrees in the power-on state. The insulation class of the motor is Class B (130 degrees), and the holding current can be reduced to 1/4 to reduce heat generation.
17 Does your motor have an IP protection rating?
Our standard motor does not have an IP protection rating, but customized products can meet your IP protection rating requirements.
18 How to choose to use constant current or constant voltage drive?
Constant current drive will increase the output force by 30% and achieve greater speed. Constant voltage drive is more suitable for low voltage applications.
1 What is a slotless brushless DC motor?
Slotless motors use cylindrical laminations, while traditional slotted laminations use teeth to accommodate the windings. The magnetic poles of the rotor interact with the teeth to generate braking (cogging) torque, so the teeth are an undesirable component. Since the laminations used in slotless motors have no teeth, braking or cogging torque is eliminated.
2 What is the life cycle expectation of a brushless motor?
One of the main advantages of brushless motors is that they have a longer service life time than most other motors. There are many factors that determine the life time of a motor. Including but not limited to operating environment, duty cycle, mechanical load, etc. Under standard conditions, the life time is determined by the ball bearing. As motor life time varies with specific applications, it is recommended that you contact DINGS’ to discuss your specific requirements.
3 When should I choose a slotless brushless motor instead of a traditional motor?
Slotless brushless motors are suitable for applications that require precise positioning and smooth torque operation, which is more applicable at low speeds. Since the friction loss in the laminations is low, they can run efficiently at high speeds.
4 What are the advantages of brushless motors over brushed motors?
Unlike the mechanical commutation (brush/commutator) of the brush motor, the brushless motor uses electronic commutation. Because there are no brushes, brushless motors can achieve higher speeds and longer life time.
Brushless motors also have higher continuous torque ratings. This is due to the fact that the stator windings are located on the "outside", achieving a higher heat conduction path
5 What information do I need to provide so that you can choose a motor solution for my application?
When determining the motor solution, it is necessary to provide information such as the supply voltage, the available continuous current and peak current, the load torque, the speed at the load, and the required motor technology (brush or brushless). Application, duty cycle (on time, off time), ambient temperature and motor size requirements (maximum diameter, length and weight) also help determine the solution. Other application details that may be important include radial or axial loads, environmental conditions (exposure to water, dust, extreme humidity, special environments), feedback requirements (encoder resolution), EMI/RFI suppression requirements, and braking requirements. For positioning applications, load inertia, angular displacement, moving time and friction torque can be provided instead of load torque and speed at load. Finally, providing quantity requirements can help us determine whether quick samples or customized solutions fully meet your needs.
6 Do I have to run the motor at rated voltage?
Not necessarily. The voltages of the available motor windings shown are only reference voltages. Certain motor parameters (including no-load speed, peak torque and peak current) are related to voltage. Therefore, a voltage must be selected to display these values. The choice of this value is subjective to a certain extent, but it provides a convenient way to compare different motor windings.
Motors can usually operate safely in the range of 0 to about 125% of the reference voltage. However, the speed depends on the voltage, which is also a factor to be considered. The motor has an optimal operating speed range, and the gearbox has a recommended maximum input speed. The general rule of thumb is that for brush motors, the motor speed should be kept above 1000 rpm, while for gear motors, the motor speed should be below 6000 rpm. It is not uncommon to exceed these power supply voltage or motor speed recommendations, but it is not entirely impossible. It is recommended that you discuss your application with DINGS’ before exceeding these limits.
7 What is the difference between 60 electrical angle Hall pitch and 120 electrical angle Hall pitch?
Both methods are applicable to Hall phase sequence, and the results are the same. Both of these methods will provide six-step commutation for brushless motors. Most motor drivers can accept two types of Hall spacing, but some driver configurations can only accept one type of Hall spacing.
