Motor Selection - Panasonic M41A1G4L Operating Instructions Manual

Motor selection

Selecting procedure
First, determine the driving mechanism and its dimensions.
Determination of
And then check the conditions required for the mechanism such as the
driving mechanism
mass of the load and traveling speed.
Calculate the load torque, moment of inertia and speed which are
Calculation of
converted to those at the motor output shaft. Refer to page A-49 to A-58
motor speed and load
for the rotation speed, load torque and moment of inertia of the load for
various mechanism.
Check the required specifications such as positioning accuracy, holding of
Check of
position, speed range, operating voltage and other environmental
required specifications
resistances for the mechanism and the machine.
Select the most appropriate motor model to meet the required
Selection of
specifications.
motor model
Select the motor and gear head based on the defined speed at the motor
Temporary selection of
shaft, load torque and moment of inertia of the load.
the motor
Make sure that the selected gear head and the motor combination meets
Final determination of
all of the required specifications including mechanical strength,
the motor and gear head
acceleration time and torque, then make a final determination.
Panasonic Corporation Electromechanical Control Business Division
industrial.panasonic.com/ac/e/
– A-48 –
© Panasonic Corporation 2018 AQCTB02E 201806-E
Checking of load torque
Hoisting application
Band wheel • SI units
D
1
T = D · W (N·m)
2
D : Diameter of drum (m)
Motor
W : Load (N)
W
Flywheel application
• SI units
Flywheel
J
T =
9.55 x 10
N : Rotating speed (r/min)
J : Inertia (kg·cm
Motor
t : Time (s)
Belt conveyor application
• SI units
F
W
1
D
T = D (F + μWg) (N·m)
2
D : Diameter of roll (m)
Motor
W : Mass of load (kg)
g : Gravitational acceleration 9.8 (m/s
μ : Friction coefficient
F : External force (N)
Horizontal travel on contact face
• SI units
1
T = D · μWg (N·m)
W
2
D
Band wheel D : Diameter of drum (m)
W : Mass (kg)
Motor
g : Gravitational acceleration 9.8 (m/s
μ : Friction coefficient
Ball screw drive
• SI units
F
1
T = P (F + μWg) (N·m)
W
2π
F : External force (N)
μ
W : Mass of load (kg)
P μ : Friction coefficient of sliding
surfaces (approx. 0.05 to 0.2)
g : Gravitational acceleration 9.8 (m/s
P : Lead of ball screw (m)
Panasonic Corporation Electromechanical Control Business Division
industrial.panasonic.com/ac/e/
• Gravitational system of units
1
T = D · W (kgf·m)
2
D : Diameter of drum (m)
W : Load (kgf)
• Gravitational system of units
N N
GD 2
· (N·m) T = · (kgf·m)
t t
4 3750000
N : Rotating speed (r/min)
) GD : Flywheel effect (kgf·cm
2 2
t : Time (s)
• Gravitational system of units
1
T = D (F + μW) (kgf·m)
2
D : Diameter of roll (m)
W : Weight of load (kgf)
)
2 μ : Friction coefficient
F : External force (kgf)
• Gravitational system of units
1
T = D · μW (kgf·m)
2
D : Diameter of drum (m)
W : Weight (kgf)
)
2 μ : Friction coefficient
• Gravitational system of units
1
T = P (F + μW) (kgf·m)
2π
F : External force (kgf)
W : Weight of load (kgf)
μ : Friction coefficient of sliding
surfaces (approx. 0.05 to 0.2)
2 ) P : Lead of ball screw (m)
– A-49 –
© Panasonic Corporation 2018 AQCTB02E 201806-E
)
2