GENERAL FEATURES
MDD RANGE
INVERTER-FED SYNCHRONOUS MOTORS
CODE CT 52
EDITION 02
Date: July 2009
Page 1
1. OVERVIEW
MDD Motors are multi-pole three-phase permanent-magnet synchronous motors - air-cooled (MDD-SN) or water-
cooled (MDD-SW). These motors are specially designed for use in high level torque applications at low rpm's. The
motors are solely driven by absolute encoder feedback vector inverters. Additionally, they are technically designed to
both eliminate mechanical components (transmissions, reducers,...) and increase precision, rigidity and overall
efficiency of the drive, which makes them ideal for direct drive applications. The mechanical configuration of these
motors offers great flexibility: through-hollow shaft, blind shaft, solid shaft or frameless.
2. MAIN TECHNICAL FEATURES
The main technical features are provided below, according to the MDD series chosen:
MDD
FEATURES
FACTOR
MDD-SN
MDD-SW
No. of poles
16
16
Degree of Protection
Type
IP54
IP54
Cooling
Air-cooled
IC410
Water-cooled
IC97W
Compact frame with double shaft ends
Form
Circular
Circular
High transient overload capacity
No. of times
Rated Torque
3
1,7
Insulation Class
H
H
Specific windings and insulation
for withstanding
high operating frequencies
Operating Type
F
F
Variable resistance temperature probes
for protection against potential overheating
Temperature Probe
PTC
KTY 84
PTC
KTY 84
3. MAIN ADVANTAGES OF USE
MDD series advantages are described below:
MDD
ADVANTAGES
MDD-SN
MDD-SW
Kinematics chain simplification (direct drive)
X
X
High torque values at low rpm's
X
X
Increased drive efficiency
X
X
Greater dynamic response due to low inertia values and low electrical time constants
X
X
Operates at a wide range of speeds at constant power
X
X
Savings in set-up and maintenance time
X
X
Dramatic increase in precision and resolution
X
X
Maximum mechanical rigidity (no need to maintain the load-to-motor inertia ratio)
X
X
High power density: smaller dimensions
X
X
Lower noise levels (dB)
X
X
Availability of rated torque from zero spee