Parker BD-E Series, Manual

Page: 35 / 48

SECTION 4. HARDWARE REFERENCE 29
Motor/Drive Package Performance Data
The torque curves for the possible motor/drive combinations are shown in Figure 4-2.
10,000
20,000
30,000
40,000
50,000
0
0
200 400 600 800 1000 1200
0
1
2
3
4
5
0
2
4
6
8
10
0 2000 1000 4000 3000 6000 5000 0
Torque
Nm
Bearing life
Hours
Torque
Nm
Torque
Nm
2000 1000 4000 3000 6000 5000
0
4
8
12
16
0 4000 3000 2000 1000
MD3475 Motor with BD150E
Bearing load data
MD3450 Motor with BD75E MD3450 Motor with BD150E
Speed, rpm
Speed, rpm
Speed, rpm
Radial load in Newtons
half way along shaft
50Jm
50Jm
50Jm
10Jm
10Jm
10Jm
5Jm
5Jm
5Jm
Cont (F)
Peak
Cont (A)
Cont (F)
Peak
Cont (A)
Peak
Cont (A)
Cont (F)
A B C D
A - 4000 rpm
B - 3000 rpm
C - 2000 rpm
D - 1000 rpm
Figure 4-2. Motor/Drive Packages Torque Curves
Regenerative Dump Considerations
The dump circuit fitted to the BD drive operates when the bus voltage exceeds a fixed level,
rather than when it exceeds the peak AC input voltage. The dump load has a continuous
capacity of 96W and a peak power of 4.5kW.
A family of dump curves is shown super-imposed on the motor torque-speed curves. These
curves (representing system inertias of 5, 10 and 50 times the motor inertia) show the maximum
speed of a repeated trapezoidal move that can be achieved without the need for additional dump
resistors. The area to the left of each curve (and beneath the peak torque curve) represents a
guaranteed safe operating area. The curves show the worst case conditions (i.e. maximum
motor temperature rise, nominal bus voltage at the start of braking and braking carried out in
current limit). If one or more of these conditions does not apply, it may be possible to operate to
the right of the safe area, but this would need to be proven by experimentation.