Q: How to Set the Current on Stepper Driver, RMS or Peak?

The RMS Current and the Peak Current are two different ways of expressing the same electrical current that flows through a stepper motor. The difference between them is in how the current is measured and calculated. <img src="https://storage.crisp.chat/users/helpdesk/website/37f68eb25a0a5200/1_k9lpaa.jpg" alt="" /> The RMS current is a measure of the effective or average current that flows through the motor coils over time. It takes into account the fact that the current is not constant but varies over time as the motor steps. The RMS current is calculated by taking the square root of the average of the squared current values over one cycle. The peak current, on the other hand, is the maximum current that flows through the motor coils during each step. It represents the instantaneous value of the current at its peak, which occurs when the motor is starting or stopping. In general, the RMS current is used to specify the rated current of a stepper motor, and it's the value that should be set on the stepper motor driver. This is because the RMS current is a more accurate representation of the average current that the motor can safely handle without overheating or damaging the coils. The peak current, on the other hand, is used to calculate the power dissipated by the motor coils, and it's important to ensure that the stepper motor driver can handle the peak current without exceeding its maximum rating. Some stepper motor drivers have a feature that can limit the peak current to

Question 1

Wiring Diagram for Closed Loop Stepper Motor

Accepted Answer

For STEPPERONLINE's closed loop stepper motor with a GX-16 and DB-15 connector, the wiring sequence is as follows:

1. Motor Connection

| Pin | 1 | 2 | 3 | 4 | | --- | --- | --- | | Pole | A+ | A- | B+ | B-| | Color | White | Green | Blue | Black | Or

| Pin | 1 | 2 | 3 | 4 | | --- | --- | --- | | Pole | A+ | A- | B+ | B- | | Color | Black | Green | Red | Blue |

2. Encoder Connection

| Pin | 2 | 3 | 1 | 13 | 11 | 12 | | --- | --- | --- | --- | --- | --- | | Encoder | VCC | EGND | EA+ | EA- | EB+ | EB- | | Color | Red | White | Black | Blue | Yellow | Green | **Note: **

The motor wire is not a shielded wire.
The encoder wire is a shielded wire, and the thick black line on the encoder wire is the shield layer of the encoder wire, which does not need to be wired.

3. The wiring diagram is as follows:

3.1 CL42T is recommended for NEMA17 or smaller closed loop stepper motors, and the driving voltage is recommended to be 24V.

3.2 CL57T is recommended for NEMA23 or 24 closed loop stepper motors, and the driving voltage is recommended to be 24~48V.

3.3 CL86T is recommended for NEMA34 closed loop stepper motors, and the driving voltage is recommend

Question 2

How to Set the Current on Stepper Driver, RMS or Peak?

Accepted Answer

The RMS Current and the Peak Current are two different ways of expressing the same electrical current that flows through a stepper motor. The difference between them is in how the current is measured and calculated.

The RMS current is a measure of the effective or average current that flows through the motor coils over time. It takes into account the fact that the current is not constant but varies over time as the motor steps. The RMS current is calculated by taking the square root of the average of the squared current values over one cycle.

The peak current, on the other hand, is the maximum current that flows through the motor coils during each step. It represents the instantaneous value of the current at its peak, which occurs when the motor is starting or stopping.

In general, the RMS current is used to specify the rated current of a stepper motor, and it's the value that should be set on the stepper motor driver. This is because the RMS current is a more accurate representation of the average current that the motor can safely handle without overheating or damaging the coils.

The peak current, on the other hand, is used to calculate the power dissipated by the motor coils, and it's important to ensure that the stepper motor driver can handle the peak current without exceeding its maximum rating. Some stepper motor drivers have a feature that can limit the peak current to

Question 3

Voltage of Stepper Motor

Accepted Answer

When discussing the voltage of a stepper motor, it is important to first clarify whether it is the Rated Voltage or the Drive Voltage.

Rated Voltage:

The rated voltage of a motor can be obtained directly from the motor's data sheet. The rated voltage is usually listed in the technical data section of the data sheet, along with other motor parameters such as rated current, holding torque, and step angle.

If you do not have access to the motor data sheet or the rated voltage is not listed, you can try to determine the rated voltage by measuring the resistance of the motor coils. Using a multimeter set to resistance mode, you can measure the resistance of each coil. The resistance values of all coils should be approximately equal and can be used to calculate the rated voltage of the motor using Ohm's Law:

|| Voltage = Current x Resistance

For example, if the rated current of the motor is 1.5 A and one coil has a resistance of 1.2 ohms, the rated voltage of the motor can be calculated as follows:

|| Voltage = 1.5A x 1.2 Ohm = 1.8V

Drive Voltage:

Each stepper motor must be connected to a driver in order to function, so the drive voltage is applied to the stepper motor driver. When talking about the voltage of a stepper motor, usually the drive voltage is meant.

![](https://storage.crisp.chat/users/helpdesk/website/37f68eb25a0a5200/dm542t-wi

Question 4

What the Differences Between the HE, HS and HP Motors?

Accepted Answer

In order to meet the needs of different customers, we have three main production bases for stepper motors, and each production base produces different series of products.

The main difference is:

| Series | E | S | P | | --- | --- | --- | --- | | Version of Motor | Economy Version | Standard Version | Professional Version | | Advantages | High cost performance | Good performance with reasonable price | High performance | | Raw Materials of Motor(Stator, magnetic steel, enameled wire, etc.) | High cost-effective raw materials, using standard molds from B-class suppliers in the market | Standard raw materials, using standard molds from A-class suppliers in the market | High-performance raw materials, using exclusively developed exclusive molds with optimized performance | | Performance of Motor | Suitable for low-speed application scenarios, the motor has 50% more torque than competing products in supermarkets | Suitable for medium and low-speed application scenarios, the motor has 5-10% more torque than the economic version | Suitable for medium and high-speed application scenarios, with lower temperature rise and 10-15% more torque than the standard version | | Application of Motor | 3D printing machines, stage lighting, security surveillance, household appliances | 3D printing machines, engraving machines, medical equipment, robots, automation equipment, household appliances | Medical equipment, aviation, energy, high-precision automation equ

Question 5

How to Choose a Power Supply for My Stepper Motor?

Accepted Answer

When using a stepper motor, you'll need a power supply to give power to stepper motor. A right power supply can make your stepper motor working at optimum performance, Instead, a wrong power supply might cause low performance or larger waste of energy.

Below are few tips for choosing Power Supply:

Confirm motor's rated current. You can find it at motor datasheet.
Confirm driving voltage. Driving voltage is main factor when choosing a power supply. Normally, higher voltage will have better performance.

Below table are the recommend voltage for stepper motors, you can choose a driving a right voltage as per your application.

Calculate the power value. We provide a simple formula for you: P=nIV*1.2

|| P: Power value || n: Number of stepper motors || I: Motor rated current || V: Driving voltage || 1.2: meaning 20% of margin

eg. 3 units of motors with 3A rated current each and driving voltage is 36V, the estimate power is about: 33A36V*1.2=388.8W. so, you can choose an 36V 400w power supplier.

**Please note that this formula is only an estimate of power and that different operating conditions will require different power. ** For example, in a 3-axis system, not all three motors operate simultaneously, and not all three motors operate at maximum load, etc. In such cases, the power value may be lower than the value calculated by the form

Question 6

What is the Difference Between T-series and Y-series Stepper Drives and T-series and E-series Servo Drives?

Accepted Answer

Before explaining the differences between the various series, we would like to introduce STEPPERONLINE's competitive mechanism. To make our team more dynamic, we have formed two technical teams composed of different technical leaders and members with different design philosophies that do not interfere with each other.

For the same product, each team launches its own product and chooses different supply chains to complete the packaging and testing of the product. This is also the origin of the different product series. The final product is brought to market, and customers and sales decide whether the product stays or goes.

This competitive mechanism ensures that STEPPERONLINE has a relatively strong competitive position in the market. Therefore, the main difference between these series lies in the design solutions and OEM manufacturers.

${color}[#fb9623](Update until February 2023:)

Stepper drive: the T series has a lower defect rate and higher stability in most applications, while the Y series has a higher defect rate in some areas. The main difference lies in the manufacturing capacity of OEM manufacturers.

Of course, this is not to say that the Y series is not recommended. If you are already using a Y series drive and getting better results from it, you can continue to use it and we will always supply it.

Servo drive: T series(T6) is suitable for applications with medium to high performance requirements, with debuggable software, with higher performance an

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