N20 DC motor drawing (N20 DC motor has a diameter of 12mm, thickness of 10mm and length of 15mm, longer length is N30 and shorter length is N10)
N20 DC motor parameters.
Performance :
1. motor type: brush DC motor
2. Voltage: 3V-12VDC
3. Rotation speed (idle): 3000rpm-20000rpm
4. Torque: 1g.cm-2g.cm
5. Shaft diameter: 1.0mm
6. Direction: CW/ CCW
7. Output shaft bearing: oil bearing
8. Customizable items: shaft length (shaft can be equipped with encoder), voltage, speed, wire outlet method, and connector, etc.
N20 DC motor custom products Real case (Transformers)
N20 DC motor + gearbox + worm shaft + bottom encoder + custom FPC + rubber ring on the shaft
N20 DC motor performance curve (12V 16000 no-load speed version).
Characteristics and test methods of DC motor.
1. at rated voltage, the fastest speed, the lowest current, as the load increases, the speed gets lower and lower, the current gets larger and larger, until the motor is blocked, the motor speed becomes 0, the current is maximum
2. the higher the voltage, the faster the motor speed
General shipping inspection standards.
No-load speed test: for example, rated power 12V, no-load speed 16000RPM.
No-load test standard should be between 14400~17600 RPM (10% error), otherwise it is bad
For example: no-load current should be within 30mA, otherwise it is bad
Add the specified load, the speed should be above the specified speed.
For example: N20 DC motor with 298:1 gearbox, load 500g*cm, RPM should be above 11500RPM. Otherwise, it is bad
Actual test data of N20 DC geared motor.
Test date: November 13, 2022
Tester: Tony, Vikotec engineer
Test location: Vikotec workshop
Product: N20 DC motor + gearbox
Test voltage: 12V
Motor marked no-load speed: 16000RPM
Batch: Second batch in July
Reduction ratio: 298:1
Resistance: 47.8Ω
No-load speed without gearbox: 16508RPM
No-load current: 15mA
| Serial number | No-load current（mA） | No-load speed(RPM) | 500g*cmLoad current(mA） | 500g*cm load speed(RPM) | Blocking current(RPM) |
|
1 |
16 |
16390 |
59 |
12800 |
215 |
|
2 |
18 |
16200 |
67 |
12400 |
234 |
|
3 |
18 |
16200 |
67 |
12380 |
220 |
|
4 |
20 |
16080 |
62 |
12400 |
228 |
|
5 |
17 |
16400 |
68 |
12420 |
231 |
|
Average value |
18 |
16254 |
65 |
12480 |
226 |
Batch: Second batch in July
Deceleration ratio: 420:1
Resistance: 47.8Ω
No-load speed without gearbox：16500RPM
No-load current: 15mA
| Serial number | No-load current（mA） | No-load speed(RPM) | 500g*cmLoad current(mA） | 500g*cm load speed(RPM) | Blocking current(RPM) |
|
1 |
15 |
16680 |
49 |
13960 |
231 |
|
2 |
25 |
15930 |
60 |
13200 |
235 |
|
3 |
19 |
16080 |
57 |
13150 |
230 |
|
4 |
21 |
15800 |
53 |
13300 |
233 |
|
5 |
20 |
16000 |
55 |
13400 |
238 |
|
Average value |
20 |
16098 |
55 |
13402 |
233 |
Batch: Third batch in September
Deceleration ratio: 298:1
Resistance: 47.6Ω
No-load speed without gearbox: 15850RPM
No-load current: 13mA
| Serial number | No-load current（mA） | No-load speed(RPM) | 500g*cmLoad current(mA） | 500g*cm load speed(RPM) | Blocking current(RPM) |
|
1 |
16 |
15720 |
64 |
12350 |
219 |
|
2 |
18 |
15390 |
63 |
12250 |
200 |
|
3 |
18 |
15330 |
63 |
11900 |
219 |
|
4 |
20 |
15230 |
62 |
12100 |
216 |
|
5 |
18 |
15375 |
61 |
12250 |
228 |
|
Average value |
18 |
15409 |
63 |
12170 |
216 |
Batch: Third batch in September
Reduction ratio: 420:1
Resistance: 47.6Ω
No-load speed without gearbox: 15680RPM
No-load current: 17mA
| Serial number | No-load current（mA） | No-load speed(RPM) | 500g*cmLoad current(mA） | 500g*cm load speed(RPM) | Blocking current(RPM) |
|
1 |
18 |
15615 |
54 |
12980 |
216 |
|
2 |
18 |
15418 |
49 |
13100 |
210 |
|
3 |
18 |
15300 |
50 |
12990 |
219 |
|
4 |
17 |
15270 |
50 |
13000 |
222 |
|
5 |
16 |
15620 |
50 |
13160 |
217 |
|
Average value |
17 |
15445 |
51 |
13046 |
217 |
Working principle of N20 DC motor.
An energized conductor in a magnetic field is subject to a force in a certain direction.
Fleming's Left hand rule.
The direction of the magnetic field is the index finger, the direction of the current is the middle finger, and the direction of the force is the direction of the thumb
Internal structure of N20 DC motor.
Analysis of the direction to which the rotor (coil) is subjected in a DC motor1.
Subjected to the direction of the electromagnetic force, the coil will move clockwise, the direction of the electromagnetic force applied to the wire on the left (facing up) and the direction of the electromagnetic force applied to this wire on the right (facing down).
Analysis of the direction to which the rotor (coil) in the motor is subjected2.
When the coil is perpendicular to the magnetic field is, the motor is not receiving the magnetic field force. However, due to inertia, the coil will continue to move a small distance. For this one moment, the commutator and the brushes are not in contact. When the coil continues to rotate clockwise, the commutator and the brushes are in contact. This will cause the direction of the current to shift.
Analysis of the direction to which the rotor (coil) in the motor is subjected 3.
Due to the commutator and the brushes, the current changes direction once every half turn of the motor. In this way, the motor will continue to rotate clockwise. Because the commutator and brushes are necessary for the continuous movement of the motor, the N20 DC motor is called: "Brushed motor"
The direction of the electromagnetic force applied to the wire on the left (facing upward) and the wire on the right
Direction of electromagnetic force (facing down)
Advantages of N20 DC motor.
1. Cheap
2. fast rotation speed
3. simple wiring, two pins, one connected to the positive stage, one connected to the negative stage, plug and play
4. The efficiency of the motor is higher than the stepper motor
Post time: Nov-16-2022