| With each application,
the drive system requirements greatly vary. In order to accommodate
this variety of needs, Aerotech offers five types of motors.
Linear
Motors
Advantages
·
Highest acceleration, highest speed
· No
backlash, windup or wear
· Brushless
– no maintenance
Slotless
Motors
Advantages
·
Ultra-smooth operation
· Zero
Cogging
· Brushless
– no maintenance
Disadvantages
·
Complex amplifier design
Brushless
Motors
Advantages
·
High acceleration
· High
torque
· Brushless
– no maintenance
Disadvantages
·
More complex amplifier design
DC
Servomotors
Advantages
·
Smooth operation, low-velocity ripple
· High
torque
Disadvantages
·
Brushes limit ability to continuously start and
stop
· Brushes
require maintenance
Microstepping
Motors
Advantages
·
Simple operation
· High
torque at low speeds
Disadvantages
·
Open loop
· Low
acceleration capability
· More
heat generation than servomotors |
Motor
Sizing Process
The following sections
describe how to choose a motor using speed, torque, and inertia
selection criteria. The basic procedure for sizing a motor
is:
1. Determine move parameters
2. Calculate load inertia (or mass)
3. Calculate peak and rms torque (or force)
requirements
While the steps for
motor sizing remain constant, different mechanical systems
require different formulas to calculate the first three
steps. The selection of the motor is determined by the general
characteristics of the motor desired and the ability of
the motor to meet the calculated requirements.
Motor
Sizing Software
Aerotech’s
Motor
Sizing Workbook is now available! This file may
be downloaded from Aerotech’s web site at www.aerotech.com.
The free-of-charge motor sizing sheet features the following
application support:
•
Linear Motor
•
Direct Drive
•
Leadscrew
•
Beltdrive
• Rack
and Pinion
|
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