How to Select bldc motor and stepper motor?

Mainly depending on the specific application of the case may be, simply to determine: the nature of the load (such as horizontal or vertical load, etc.), torque, inertia, speed, accuracy, acceleration and deceleration, etc., the upper control requirements (such as port interface and communication requirements), is the main control position, torque or speed mode. Power supply is DC or AC power or battery power supply, voltage range. Accordingly, to determine the motor and equipped with the drive or controller models.

Choose the stepper motor or bldc motor controller?

In fact, the choice of what kind of motor should be based on the specific application, depending on their own characteristics. Please see table below, naturally understand.

Stepper motor system bldc motor system

Small and medium-range torque torque (20Nm usually less) small medium large, full range

Low speed range (usually in the following 2000RPM, high torque motor is less than 1000RPM) high (up to 5000RPM), DC bldc motor can even reach 1 to 2 million r / min

Main control position control diverse intelligent control, position / speed / torque mode

Vibration at low speed smoothness (but with a sub-type of drive can be improved) is good, runs smooth

Accuracy is generally low, higher high when the sub-type drive (depends on the specific feedback device resolution)

Torque-frequency characteristics of high speed, good torque down fast torque characteristics, features hard

Overload overload feature will be out of step 3 to 10 times overload (short)

The majority of open-loop feedback control mode, the encoder can also be connected to prevent the loss of step closed loop encoder feedback

Encoder Type – Optical Rotary Encoder (Incremental / Absolute), resolver-based

Response speed is generally fast

How equipped with bldc motor controller?

According to the motor current, with the greater than or equal to the current drive. If you need a low vibration or high accuracy, can be equipped with a sub-type drive. For high torque motor, as with high voltage drive to get good high speed performance.

2 phase and 5 phase bldc motor What’s the difference, how to choose?

2-phase motor and low cost, but the larger the vibration at low speeds, the torque at high speed down quickly. 5-phase vibration motor is smaller, high-speed performance, compared with 2-phase motors, high-speed 30 to 50%, in some cases replace bldc motor.

When to select a DC servo system, servo it What’s the difference?

Bldc motor into a DC brush and brushless motors.

Brush motor, low cost, simple structure, starting torque, wide speed range, easy control, the need to maintain, but easy to maintain (for brushes), generate electromagnetic interference, the environment requirements. Therefore, it can be used for cost-sensitive general industrial and civil applications.

Brushless motor, small size, light weight, large output, fast response, high-speed, inertia is small, smooth rotation, torque and stability. Control complex, easy to implement intelligent, flexible way to their electronic commutation, the commutation can be square wave or sine wave commutation. Motor maintenance-free, high efficiency, low operating temperature, electromagnetic radiation is very small, long-life, can be used in various environments.

AC bldc motor is brushless motor, is divided into synchronous and asynchronous motors, motion control in general are currently with the synchronous motor, its power range, can do a lot of power. Large inertia, the maximum rotation speed is low, and with the power increases rapidly reduced. Therefore suitable for low speed applications running smoothly.

The motor should pay attention to the problem?

The power to run before you make the following checks:

1) the appropriateness of the supply voltage (overvoltage is likely to cause damage to the driver module); for the DC input of + / – polarity must not be wrong, the motor drive controller on the model or the current setting is appropriate (do not start too);

2) control signal line connected, secure, industrial site is best to consider shielding (such as the use of twisted-pair);

3) Do not put the need to take the start line all connected, only the most basic system even as, well, then gradually connection.

4) The grounding method must be clear, or the use of float is not connected.

5) began running half an hour to closely observe the motor state, such as the movement is normal, sound and temperature, and found the problem immediately stop adjustment.