Editing Configuring linear servo motor
Your changes will be displayed to readers once an authorized user accepts them. (help) |
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.
The edit can be undone.
Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
Latest revision | Your text | ||
Line 1: | Line 1: | ||
− | [[File: | + | [[File:Linearencoder.jpg|thumbnail|A typical sealed linear encoder]] |
− | [[File: | + | [[File:Linearservo cutaway.jpg|thumbnail|Ironless linear motor cross-section]] |
− | + | Linear servo motor is an actuator producing linear force or motion and is constructed from a linear motor and a linear feedback device such as linear encoder. | |
− | Linear servo motor is an actuator producing linear force or motion and is constructed from a linear motor and a linear feedback device such as linear encoder | + | |
Linear servo motor is electrically equivalent to a rotary motor, so drive sees no difference between the two. However, as drive parameters are entered for rotary motor only, they need some calculations to suit for linear motor. | Linear servo motor is electrically equivalent to a rotary motor, so drive sees no difference between the two. However, as drive parameters are entered for rotary motor only, they need some calculations to suit for linear motor. | ||
Line 8: | Line 7: | ||
==Configuration== | ==Configuration== | ||
===Preparations=== | ===Preparations=== | ||
+ | [[File:Linearmotortrack.png|thumbnail|Magnetic pole pair pitch illustrated]] | ||
Needed parameters of linear motor: | Needed parameters of linear motor: | ||
− | *Magnetic pole | + | *Magnetic pole pitch (or pole pair pitch) |
*Forcer winding specifications: | *Forcer winding specifications: | ||
**Maximum currents: continuous and peak | **Maximum currents: continuous and peak | ||
Line 17: | Line 17: | ||
Needed linear feedback device parameters: | Needed linear feedback device parameters: | ||
*Resolution (lines or pulses per millimeter) | *Resolution (lines or pulses per millimeter) | ||
− | + | ===Conversion of parameters=== | |
− | + | ||
− | === | + | |
In this step we convert the values so that motor can be driven from a servo drive. The drive is made to believe that the linear motor is rotary motor, so we need to figure out the equivalent rotary motor parameters. | In this step we convert the values so that motor can be driven from a servo drive. The drive is made to believe that the linear motor is rotary motor, so we need to figure out the equivalent rotary motor parameters. | ||
This example works with [[Granity]] software. Follow your drive's setup guide for all parts except these: | This example works with [[Granity]] software. Follow your drive's setup guide for all parts except these: | ||
− | #Set | + | #Set [[MT]] Motor type as 3 phase AC or BLDC motor |
− | #Set | + | #Set [[MPC]] Pole count to 2 |
− | #Set | + | #Set [[FBR]] Feedback device resolution to a value calculated as: Lines per mm*Pole pair pitch. For example if we have a linear encoder with 100 pulses per mm and a linear motor with 50 mm pole pair pitch (25 mm pole pitch), we calculate FBR = 100*50 = 5000. If the FBR value becomes larger than 50000, then a special drive firmware may be necessary (request it from Granite Devices). |
− | #Set | + | #Set [[MTC]] Thermal time constant according to your motor. If the value is unknown, it is recommended to start with low values such as 30 seconds as the forcer of linear motor may have very low time constant. MTC attempts to protect motor from overheating. |
− | #Finally as usual, | + | #Finally as usual, [[FBI]] parameter must be set properly to achieve proper configuration. |
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + |