Safir Spindle Servo Drive Makes CNC Machine Tools Better

- Oct 17, 2018-

There are two kinds of spindles commonly available on the market, one is a mechanical spindle, the motor and the spindle are connected by a timing belt; the other is an electric spindle, and the motor is directly connected to the cutter. The mechanical spindle motor speed is generally not high, within 8000r, the motor speed of the electric spindle motor can be more than 15000.

The drive components of the CNC machine tool actuator include the spindle drive unit, the feed unit, the spindle motor and the feed motor. The spindle and feed drive can be realized by an electric or electro-hydraulic servo system under the control of the numerical control unit. When several feeds are linked, the positioning, straight line, plane curve and space curve can be processed.

There are two kinds of spindles commonly available on the market, one is a mechanical spindle, the motor and the spindle are connected by a timing belt; the other is an electric spindle, and the motor is directly connected to the cutter. The mechanical spindle motor speed is generally not high, within 8000r, the motor speed of the electric spindle motor can be more than 15000.

The following is an example of the Safide Electric MSD100A spindle servo drive, which is introduced in the application of CNC machining center.

First, the general requirements for spindle control:

1. The spindle drive system needs fast response, high speed and strong overload capability;

2. The spindle drive system needs to realize the orientation and feed function;

3, to meet the system automatic tool change, rigid tapping, spindle feed function and other processing requirements for spindle position control performance is very high.

Second, Safford Electric MSD100A spindle servo drive features

1. The frequency of the servo drive of the MSD100A spindle servo is 1200Hz, which can easily drive the electric spindle and the mechanical spindle motor.

2, support a variety of encoders, support for rotary and ordinary incremental encoders.

3. It can drive synchronous motor and asynchronous motor, which can be easily dealt with for synchronous and asynchronous spindle systems.

4, the domestic high-power servo drive, the maximum can be achieved 400KW

5, compatible with all CNC systems, such as the new generation, Bao Yuan, Siemens, Mitsubishi, Fanuc, wide number, Huazhong CNC and so on.

6. Fast response, high positioning accuracy, no overshoot, 0Hz can output 200% starting torque, speed control accuracy ±0.02%, speed fluctuation ±0.1%; encoder can also be installed when not installed on the motor There is PG vector control; it has over-speed and speed deviation detection function.

7, with zero-speed lock axis, spindle orientation and carry, rigid tapping function: spindle orientation has multiple positions, can be switched, can be used for multi-tool systems, such as tool change. Rigid tapping can be controlled by analog or pulsed. Spindle orientation, pulse position control, and pulse speed control can be switched by terminals, and the position control precision is high, and the positioning accuracy can reach ±1 line pulse.

8, high torque control accuracy, suitable for a variety of materials and multi-process processing; torque control accuracy ± 5%, support a variety of torque settings, a variety of forward and reverse speed limit.

9. Support motor parameter automatic identification: In addition to identifying asynchronous or synchronous motor parameters, it also recognizes the encoder and automatically adjusts the encoder direction; it has the motor online identification function to eliminate the influence of motor heating on the control characteristics.

Third, the spindle orientation introduction

The drive receives the spindle orientation signal to cause the spindle to quickly stop at a certain position and provide a certain holding torque to the motor position ring. Spindle orientation control is the use of the encoder, the encoder is preferably connected to the spindle 1:1, which ensures the accuracy of the orientation.

Fourth, the practical application

CNC machining center spindle servo positioning requires 485 bus type, can quickly respond to machine start and stop (0-5000 rpm 0.5 seconds) under energy consumption braking, quasi-stop function, zero servo to achieve cutting, drilling, angular positioning, rigidity Tapping and other functions.

V. Debugging process and results

1. Attack the hole of No. 45 steel plate M20.

2, M20 tapping, tooth distance 2.5, excellent effect.

3, continuous uninterrupted total of more than 80 tapping without any problems, the effect is excellent.


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