Motor Radial Load Force Ratings
Motors are capable of carrying an axial load in most applications. The following table provides
guidelines for 20,000 hour bearing life with a specified radial load applied to the center of the shaft.
Please consult with Reliance Motion Control regarding loads, operating speeds and bearing life in
your particular application to ensure the proper selection of motors.
Brake Motor Application Guidelines
The brakes offered as options on these servo motors are holding brakes. They are designed to hold
the motor shaft at 0 rpm for up to the rated brake holding torque. The brakes are spring-set type, and
release when voltage is applied to the brake coil.
The brakes are not designed for stopping rotation of the motor shaft. Servo drive inputs should be
used to stop motor shaft rotation. The recommended method of stopping motor shaft rotation is to
command the servo drive to decelerate the motor to 0 rpm, and engage the brake after the servo drive
has decelerated the motor to 0 rpm.
If system main power fails, the brakes can withstand use as stopping brakes. However, use of the
brakes as stopping brakes creates rotational mechanical backlash that is potentially damaging to the
system, increases brake pad wear and reduces brake life. The brakes are not designed nor are they
intended to be used as a safety device.
A separate power source is required to disengage the brake. This power source may be controlled by
the servo motor controls, in addition to manual operator controls.
Brake Specifications
STANDARD RADIAL LOAD FORCE RATINGS
500 rpm
1000 rpm
2000 rpm
3000 rpm
4000 rpm
5000 rpm
6000 rpm
MOTOR
lb (kg)
lb (kg)
lb (kg)
lb (kg)
lb (kg)
lb (kg)
lb (kg)
N-2302
17 (8)
16 (7)
14 (6)
12 (5)
11 (5)
9 (4)
8 (4)
N-2304
19(9)
17 (8)
15 (7)
14 (6)
12 (5)
10 (5)
8 (4)
N-3406
103 (47)
82 (37)
65 (29)
56 (25)
51 (23)
48 (22)
45 (20)
N-3412
113 (51)
89 (40)
71 (32)
62 (28)
56 (25)
53 (24)
49 (22)
N-4214
137 (62)
109 (49)
86 (39)
76 (34)
68 (31)
64 (29)
N-4220
146 (66)
116 (53)
92 (42)
80 (36)
73 (33)
68 (31)
N-5630
188 (85)
149 (68)
118 (54)
103 (47)
94 (43)
N-5637
197 (89)
156 (71)
124 (56)
108 (49)
98 (44)
N-5647
203 (92)
161 (73)
128 (58)
112 (51)
NOTE: When motor shaft has no radial load, axial load rating = 100% of radial load rating above.
When motor shaft has both a radial load and an axial load, axial load rating = 44% of radial load rating above.
BRAKE DATA
MOTOR
MAX. BACKLASH
HOLDING TORQUE
COIL CURRENT
SERIES
(BRAKE ENGAGED)
(lb/in)
(Nm)
at 24 VDC
N-2300
1 degree
5
0.56
0.28 ADC
N-3400
15
1.69
0.36 ADC
N-4200
30
3.39
0.36 ADC
N-5600
50
5.64
0.71 ADC
P0010
Axial load force
Radial load force applied at center of shaft extension
