Bosch DOK-MOTOR-MCL Series, Project Planning Manual

Page: 150 / 196

11.4.4 Power loss
The power loss corresponds the electric continuous power loss of the motor.
P
V
Electrical power loss of motor in W
F
eff
Effective force in N
F
N
Rated force of the motor in N (see Chapter 4 ”Technical data”)
P
vN
Rated power loss of the motor in W (see Chapter 4 ”Technical
data”)
Fig. 11-26: Required cooling capacity of the linear motor
11.5 Energy regeneration
Compared with rotary servo motors, the energy of a linear motor during de‐
celeration is lower. The translatory velocity of a linear motor is usually much
lower than the circumferential speed of a rotary servo motor.
The regeneration energy of a synchronous linear drive results from the ener‐
gy balance during the deceleration process. To size additional brake resistors
or power supply units with feedback capability, it can be estimated as follows.
P
R
Regeneration energy during a deceleration phase in W
P
Ravg
Average regeneration energy over total duty cycle time in W
m Moved mass in kg
v Maximum velocity in m/s
t
b
Braking time in s
F
R
Frictional force in N
R
12
Winding resistance of the motor at 20°C in Ohm
(see Chapter 4 Technical Data)
a
max
Braking deceleration (negative acceleration) in m/s²
k
iFN
Motor constant in N/A
t
all
Total duty cycle time in s
Fig. 11-27: Regeneration energy of the linear motor
Prerequisites: Velocity-independent friction
Constant deceleration
Bosch Rexroth AG DOK-MOTOR*-MCL********-PR05-EN-P 148/193
Rexroth IndraDyn L Ironless Linear Motors MCL
Motor dimensioning