Category: Stepper Motor
Independent Dual Shaft Stepper Motor ◆Drive 2 pointers independently. ◆High precision: 1/12° step angle. ◆Low consumption: current ＜18mA
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1. Overview
MDR28 series stepper motor is a specially design based on MDR29 series, which can drive 2 pointers independently in a compact appearance. It can help to reduce the instrument cluster panel space.
2. Main Feature
3. Typical Application
The typical application of MDR28 series stepper motor is used for the instrument cluster of minicar and motorcycle which just has limited space for the instrument.
4. Operating Principle
Through the built-in 4-gear transmission system with 1/180 deceleration ratio, the pointer shaft will rotate 1° while the rotor rotates 180° driven by a full-step driving signal. And in partial-step mode, the pointer shaft will rotate 1/3° while the rotor rotates 60°.
In order to make motor run more stably and decrease the noise especially when pointer loaded on pointer shaft, micro-step mode is recommended. The micro pulse sequence, which is more precise and near to sine wave, could drive pointer shaft to rotate 1/12º at each micro step.
|
Parameter |
Symbol |
Test Conditions |
Min. |
Typ. |
Max |
Unit |
|
Operating Temperature |
Ta |
|
-40 |
|
105 |
ºC |
|
Coil Resistance |
Rb |
|
260 |
280 |
300 |
Ω |
|
Operating Current |
Im |
fz=200Hz |
|
15 |
20 |
mA |
|
Magnetic Saturation Voltage |
Ubs |
|
|
|
9 |
V |
|
Start-Stop Frequency |
fss |
JL=2x10-7kgm2 |
|
|
200 |
Hz |
|
Maximum Driving Frequency |
fmm |
JL=2x10-7kgm2 |
|
|
600 |
Hz |
|
Dynamic Torque |
M200 |
fz=200Hz |
0.9 |
1.1 |
|
mNm |
|
M400 |
fz=400Hz |
0.75 |
0.9 |
|
mNm |
|
|
Static Torque |
Ms |
Ub=5V |
3.5 |
4.0 |
|
mNm |
|
Noise Level |
SPL |
|
|
39 |
42 |
dB(A) |
|
Angle of Rotation |
β |
with internal stop |
|
|
320 |
Degree |
|
without internal stop |
|
|
360 |
Degree |
||
|
Gear Play |
σ |
|
|
0.7 |
1.0 |
Degree |
|
Force Allowed on the Pointer Shaft |
||||||
|
Axial Force (push) |
FA |
|
100 |
120 |
|
N |
|
Axial Force (pull) |
Fa |
80 |
100 |
|
N |
|
|
Perpendicular Force |
FP |
12 |
15 |
|
N |
|
|
Imposed Acceleration |
αP |
|
1000 |
|
Rad/s2 |
|
|
Holding Torque |
Th |
90 |
120 |
|
mNm |
|
Note: fz = testing frequency, JL = testing pointer inertia, Ub = operating voltage
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