Engineering Guide CDA3000
2-43
2 Drive definition
DE
EN
1
2
3
4
5
6
7
A
Project planning notes
A 3-phase AC reluctance motor is a special motor which must be tested
anew prior to every production deployment. Depending on the
situation, smooth running, heat, noise or vibration problems may occur.
The following table presents a listing of key points which may need to be
considered.
Detailed information can only be provided by the manufacturer of the
reluctance motor, however.
Subject
Project planning notes
Motor design
See manufacturer’s data sheet
Tips:
•
Winding always in star configuration (high inductance)
•
Inquiries for motors for S3 to S6 operation must usually be
submitted separately
•
Motor protection only possible via PTC or Klixon
•
High tendency to vibrate, especially < 25Hz
Inverter design
In static operation
•
I-Inverter
≈
1,2 I
N
Motor
In dynamic operation
•
I-Inverter
≈ 1.8
I
N
Motor
•
Shut down the slip compensation, load compensation and V/F
characteristic adaptation software functions
•
V/F characteristic with at least 3-6 fully programmable inter-
polation points
•
At frequencies > 150 Hz an additional filter must very often be
inserted in the motor cable
•
The max. output frequency must not be higher than F
N
(frequency nominal point).
•
When motors are connected up a very high short-circuit cur-
rent flows (typically up to 30-40 times I
N
)
Table 2.12
Project planning notes for drive system with reluctance motors
