Editing Motor types
| 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: | ||
| − | + | Servo motor is a electromechanical mechanical actuator with feedback allowing precision closed loop motion control and monitoring. | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
==Construction== | ==Construction== | ||
Servo motor consists two main parts: | Servo motor consists two main parts: | ||
*Motor part - typically electromagnetic device that produces torque or force when driven with current | *Motor part - typically electromagnetic device that produces torque or force when driven with current | ||
| − | * | + | *Feedback device - typically electronic device that outputs measurement information such as shaft angle or velocity |
| − | + | ||
==Shapes== | ==Shapes== | ||
| − | + | Servo motors and feedback devices come mainly in two shapes: | |
*Rotary | *Rotary | ||
*Linear | *Linear | ||
| − | Shape of motor doesn't change their electromechanical | + | Shape of motor doesn't change their electromechanical princible so both types of motors can be driven with same drives. |
==Motor technologies== | ==Motor technologies== | ||
List of electromagnetic motor part types. | List of electromagnetic motor part types. | ||
===AC=== | ===AC=== | ||
Typical AC (alternating current) servo motor is a 3 phase permanent magnet syncronous machine. This type of motors are driven by 3 wires each driving one phase coil. In ideal case 3 phase AC servo is driven by sinusoidal current waveforms that are synchronized to the permanent magnet rotor. | Typical AC (alternating current) servo motor is a 3 phase permanent magnet syncronous machine. This type of motors are driven by 3 wires each driving one phase coil. In ideal case 3 phase AC servo is driven by sinusoidal current waveforms that are synchronized to the permanent magnet rotor. | ||
| − | + | ==BLDC== | |
BLDC (brushless DC) is very similar to AC motor with only expection that it is desgined to be driven by trapezoidal current waveforms instead of sinusoidal. BLDC motors can always be driven with same drives regardless of current waveform matching. | BLDC (brushless DC) is very similar to AC motor with only expection that it is desgined to be driven by trapezoidal current waveforms instead of sinusoidal. BLDC motors can always be driven with same drives regardless of current waveform matching. | ||
| − | + | ==Brush DC== | |
Brush DC (direct current) motors typically have permanent magnet stator and rotor with mechanical commutator with brushes. | Brush DC (direct current) motors typically have permanent magnet stator and rotor with mechanical commutator with brushes. | ||
| − | |||
| − | |||
| − | |||
==Comparison== | ==Comparison== | ||
| − | |||
{| class="wikitable" | {| class="wikitable" | ||
|- | |- | ||
| Line 36: | Line 24: | ||
| [[Closed loop]] || No || Yes || Yes || Yes | | [[Closed loop]] || No || Yes || Yes || Yes | ||
|- | |- | ||
| − | + | | Torque control || No, inpractical || Yes || Yes || Yes | |
|- | |- | ||
| − | + | | Velocity control || Yes || Yes || Yes || Yes | |
|- | |- | ||
| − | + | | Position control || Yes || Yes || Yes || Yes | |
|- | |- | ||
| Available speed range || Low, Medium || Medium || High || Highest | | Available speed range || Low, Medium || Medium || High || Highest | ||
| Line 46: | Line 34: | ||
| Rated torque vs size || High || Low || Medium || Medium | | Rated torque vs size || High || Low || Medium || Medium | ||
|- | |- | ||
| − | | Dynamic performance || Low, | + | | Dynamic performance || Low, Medium || Medium||High||Highest |
|- | |- | ||
| − | | Motion smoothness || | + | | Motion smoothness || Very low to high||Medium||Medium||High to very high |
|- | |- | ||
| Endurance || High || Medium || High || High | | Endurance || High || Medium || High || High | ||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
|} | |} | ||
| − | + | ==Feedback device types== | |
| − | == | + | ===Quadrature encoder=== |
| − | + | ===Resolver/synchro=== | |
| − | + | ===Tachometer=== | |
| − | + | ===Hall sensors=== | |
