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There are many kinds of micro DC motor. Each kind of micro DC motor has different uses and working principles. Let me talk about series excited DC motor.


The excitation and armature windings are connected in series, so the motor is called. Single phase series excitation motor can work with AC power supply or DC power supply. It belongs to dual-purpose motor.
 Micro DC motor
Characteristics of series excited DC motor
High speed
Large starting torque
Small size
Light weight
It is not easy to stall
The application range of voltage is very wide, and the speed can be adjusted by adjusting voltage, which is simple and easy to realize.

The rotor of the series excitation motor is connected with the excitation coil in series. The entire armature rotor current is transferred to the field winding. Therefore, only one input voltage is required. Torque is equal to the square of the current. Increasing the rotor current will cause the excitation current to increase.

When series excitation DC motor When stopped, the torque is the highest, because the armature (rotor) does not produce back electromotive force (BEMF) at rest;
When the rotor accelerates, BEMF increases, which in turn reduces the effective current, voltage and torque;
In the case of no load, the motor will accelerate to dangerous speed;
The increased load slows down the motor, but reduces the BEMF and increases the torque to turn the load

It is worth mentioning that the rotor current of series excited DC motor will decrease under no load or light load. Because of the series excitation relationship between rotor winding and excitation winding, the magnetic field will decrease;
The formula of motor speed is: n = (U-IR) / CE Φ. In the formula, the denominator Φ (magnetic flux) becomes very small, so the speed will be very high. In this way, the motor will appear "flying" phenomenon, which may damage the motor or cause personal injury. Therefore, the series excited DC motor can not run without load!

Series motor can not adjust the speed well because the speed control depends on the regulation of power supply voltage. Even so, they are cheap enough to drive designs that require high starting torque. For example, designers use consumer products such as series excited motors, power tools, toys and sewing machines as well as fixed and variable speed industrial traction drives in low and high-power automotive mechanisms. The designer can reverse the series motor by reversing the excitation or the armature (rotor) winding connection.

Series motor is widely used in electric tools, kitchen supplies and floor care products due to its wide adjustable speed range and large starting torque. For more information about micro motor, please continue to pay attention to Tianfu motor (www.tianfudmotor. Com)
Dongguan Tianfu Electric Machinery Technology Co., Ltd. copyright copyright? 2018 technical support: Dongguan website construction Yue ICP Bei 18062917 [ BMAP ] [ GMAP ] [ back-stage management ]
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