MPH-02, MPB-02, MPD-02
Motor, Mechanical Axis System, Measuring Systems
5-27
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
Requirements on Third-Party Motors
Dielectric Strength of the Winding
The dielectric strength of third-party motor windings has to be checked.
Depending on the controller that is used there are different loads:
Controller type
Max. voltage amplitude û
max
between
motor terminals and
motor terminals against housing
(ground)
Rate of rise
of voltage
du/dt
HMS, HMD at HVE,
HMV (3x400VAC)
HCS (3x400VAC)
1200 V
pp/2
8kV/µs
HMS, HMD at HVR
HMS, HMD at
HVE (3x480VAC)
HCS (3x480VAC)
1500 V
pp/2
10kV/µs
Fig. 5-12: Voltage load of motors depending on the controllers
Motor Inductance
Depending on the controller used, the motor has to have a minimum
value for inductance. The actually available inductance of a motor can be
measured directly between two motor terminals by means of an
inductance measuring bridge. The measurement has to be made for a
complete motor wired for normal operation but not yet connected. During
the measurement one motor terminal remains open!
For asynchronous motors the measured value can only be used if the
rotor doesn’t have closed slots!
Controller
Minimum required motor inductance
HMS, HMD at HVE,
HMV (3x400VAC)
HCS (3x400VAC)
L
U-V
= 80* 4/(
√
2 * I
Type
* PWM)
(in mH)
HMS, HMD at HVR
HMS, HMD at HVE,
HMV (3x480VAC)
HCS (3x480VAC)
L
U-V
= 116* 4/(
√
I
Type
* PWM)
(in mH)
I
Type
type current of selected controller (rms value)
PWM:
desired pulse width modulation frequency in kHz
Fig. 5-13:
Minimum inductance depending on controller data, supplies and
supply voltage
If the inductance of the third-party motor is lower than indicated in the
above table, a three-phase choke has to be connected in the motor feed
wire. This choke has to increase the inductance that can be measured
between two motor terminals to the minimum value.
Note:
When the inductance is measured, different inductance values
can be determined at different rotor positions within one pole
pair distance of the motor. The average value is relevant for
the check of the minimum value.
Attention:
Correct values can only be determined when the
motor is in standstill!
Courtesy
of
CMA/Flodyne/Hydradyne
▪
Motion
Control
▪
Hydraulic
▪
Pneumatic
▪
Electrical
▪
Mechanical
▪
(800)
426-5480
▪
www.cmafh.com