Brushless Motor

Because the rotor is free of other objects (no brush), it is designed for high power, and noise-less by principle. It is suitable for long-life use.

Brushless Motor
Output Because of no-contact design (no brush/commutator like cored/coreless motor), large current can be input and heat in the coil dissipates quickly
Life Long life time because of no-contact design
Control Linear characteristics
Cogging No magnetic cogging

In our brushless motor, we removed the mechanical contacts such as brushes and commutators used in conventional brushed motors, and applied an electric signal to take their place. The brushless motor requires an electric circuit board because there is no commutator. This motor (circuit board) has two types, one with a magnetic sensor, and the other with no sensor. The one with the magnetic sensor detects its position via the sensor, and the other detects the rotor magnet position via back-EMF. Brushless motor's features are as follows:

Features

  1. Stator coil is located outside in inner rotor type brushless motor. Therefore, it is good in heat dissipation.
    Because there are no contacts (brush/commutator), large current can be input to answer to high power needs.
  2. No mechanical noise and no electric noise for switching current(no brush and no commutator)
  3. Long life and high reliability (due to no-contact design)

In Namiki's brushless motor, stator is a slot-less core with cup-shaped coil, and rotor is the magnet inside. Therefore, magnetic force is even regardless of coil/magnet position, and motor rotation is free of cogging.

Issues & Challenges in Brushless Motor

As brushless motors have no mechanical contacts for polarity switching, they have high power and long lifespan. However, due to the rotating magnet core, the inertia is much larger than that of coreless brushed motor and the response time slower.
Namiki presents brushless motors that address these issues equally.

Brushless Motor Standard Model

Pro-
ducts
Dia.
[mm]
Len-
gth
[mm]
Nominal
Voltage
[V]
Nominal Values No load Stall Mecha-
nical
time
constant
[ms]
Max
effici-
ency
[%]
Option
Torque
[mNm]
Speed
[rpm]
Cur-
rent
[mA]
Out-
put
[W]
Speed
[rpm]
Cur-
rent
[mA]
Tor-
que
[mNm]
Cur-
rent
[A]
Connection Bearing
Termi-
nals
lead-
wire
slee-
ve
BB
BMN04-0829 4 8 3.0 0.01 24,200 53 0.04 37,000 28 0.04 0.10 9.2 22 A (sensorless) ×
BMN07-1207 7 13 3.0 0.06 17,100 182 0.2 21,300 120 0.30 0.43 7.3 22 B(A※) ×
BMN07-1218 5.0 0.06 17,900 117 0.2 22,300 78 0.30 0.28 7.7 22 B(A※) ×
BMS10-1003 10 10 4.0 0.17 30,400 384 0.9 37,900 185 0.86 1.19 10.9 37 C ×
BMS10-1008 6.0 0.15 27,100 208 0.8 33,800 103 0.75 0.63 11.1 36 C ×
BMS10-1803 18 7.4 0.63 27,000 351 4.5 31,300 63 4.54 2.14 3.9 69 C ×
BMS10-1806 12.0 0.68 30,800 268 4.9 35,800 49 4.86 1.61 4.1 68 C ×
BMS12-1503 12 15 7.4 1.05 21,461 523 3.9 26,200 113 5.73 2.35 4.3 61 D ×
BMS12-1506 12.0 1.10 25,683 394 5.2 31,000 82 6.33 1.87 4.6 63 D ×
BMS12-2102 21 7.4 1.83 19,200 706 6.9 22,800 100 11.60 3.94 2.7 71 D ×
BMS12-2104 12.0 1.60 21,100 418 7.7 24,300 70 12.09 2.70 2.8 70 D ×
BMS16-2001 16 20 7.4 3.20 18,800 1305 9.4 23,800 188 15.06 5.45 5.7 66 D
BMS16-2004 12.0 2.42 19,700 620 9.7 23,200 113 15.97 3.46 5.3 67 D
BMS16-2013 24.0 2.45 21,100 334 10.6 24,800 60 16.30 1.88 5.5 67 D
BMS16-3001 30 7.4 3.25 12,600 807 9.5 14,500 123 25.10 5.39 3.6 72 D
BMS16-3002 12.0 3.90 14,800 660 15.4 16,600 86 35.33 5.29 2.9 76 D
BMS16-3010 24.0 3.86 14,000 311 14.0 15,800 41 33.84 2.41 2.9 76 D
BMS17-1821 17 18 24.0 2.36 16,000 291 6.2 20,000 72 11.80 1.17 16.3 57 D ×
BMS22-2113 22 22 24 5.50 10,000 381 10.2 12,000 80 32.30 1.85 7.9 62 D ×

Brushless Motor 4pole High Torque Model

Pro-
ducts
Dia.
[mm]
Len-
gth
[mm]
Nominal
Voltage
[V]
Nominal Values No load Stall Mecha-
nical
time
constant
[ms]
Max
effici-
ency
[%]
Option
Torque
[mNm]
Speed
[rpm]
Cur-
rent
[mA]
Out-
put
[W]
Speed
[rpm]
Cur-
rent
[mA]
Tor-
que
[mNm]
Cur-
rent
[A]
Connection Bearing
Termi-
nals
lead-
wire
slee-
ve
BB
B4S12-2108
with Encoder
12 21 12.0 11.1 13111 277 4.5 15320 55 11.1 1.59 3.5 66 D
B4S12-2109
with Encoder
15.0 11.6 16646 279 5.9 19300 56 11.6 1.68 4.2 67 D
B4S22-32XX
with Encoder
with Gear
22 32 24.0 9.0 4900 255 11.2 5540 34 77.15 1.93 4.0 75 E ×

Meaning

    • ○ = Available as standard
    • △ = Available as option
    • × = Not available
    • A∼G = Pin assignment pattern (see table)

Brushless Motor Pin Assignment Pattern

Pattern   #1 #2 #3 #4 #5 #6 #7 #8 Applicable motor
A FPC coil U coil V COM coil W - - - - BMN04, BMS07
(sensorless時)
B sensor V sensor U Gnd Vdd sensor W coil V coil W coil U BMS07
C leadwire coil W coil U sensor U sensor V sensor W coil V Gnd Vdd BMS10 series
D coil U coil V coil W Vdd Gnd sensor U sensor V sensor W BMS12/
BMS16 series/
B4S12
E coil W coil V coil U Gnd Vcc sensor W sensor V sensor U B4S22-3212
F Terminals coil W sensor W COM coil W - - - - BRS/BRT17-15
BRS/BRT17-18
G H1 sensor U H2 Vcc H3 Gnd H4 sensor W H5 sensor W L1 coil U L2 coil V L3 coil W BRS/BRT12-15

Outer Rotor Pancake Brushless Motor

Products Dia. [mm] Thickness [mm] Nominal Voltage [V] No-load Stall
Speed [rpm] Current [A] Toreque [mNm] Current [A]
SOBL23-1207 23 12 12 5730 0.127 26.8 1.38

Driver

Products Voltage supply:VCC Applicable motor types
SSD06-R5A 1.8~ 5.5 Sensorless brushless motors;
BMN04-08XX, BMN07-12XX
SHSD24-01A 7.5~ 26.4 All NAMIKI brushless motors

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