YK MICRO CO., LTD. 86-755-2296-4350

clutch,Printer clutch, copier clutch

  • Place of Origin
  • Brand Name
  • Certification
  • Model Number
  • Minimum Order Quantity
  • Price
  • Packaging Details

clutch,Printer clutch, copier clutch

The coil of an electromagnetic clutch or brake is an induced load. Even if a certain voltage is applied, the current will not rise immediately, but slowly. Its lure
The magnitude of the conductive load is expressed by its inherent value (inductance). It is similar to how the number of revolutions slowly rises when a large flywheel is started by a motor.
Since the electromagnetic clutch or brake uses DC excitation, the inductance will be different when measured with normal AC. In this case, when using
The time constant expresses the coil characteristics of the clutch or brake.
The time constant (t) is equal to the inductance (L) divided by the coil resistance (R), and it can be easily measured by applying a certain voltage.
That is, after the voltage specification is applied to the coil, the time until the current value reaches 63.2% of the saturation value is the time constant. General electromagnetic clutch or brake
The time constant of the device is tens to hundreds of milliseconds.
The above is the situation where the excitation occurs. On the contrary, when the excitation is cancelled, the inductance of the coil will maintain the operation of the coil current. After the circuit is forcibly disconnected, the residual energy in the coil will appear in the form of a reverse potential difference. This situation is called back electromotive force or reverse voltage, which can reach dozens of times the excitation voltage. The reverse electromotive force produces arc discharge at the disconnected switch contacts, causing damage to the circuit contacts and semiconductor components, and aging of the coil insulation. Use suitable
When the absorption circuit or protection element reduces the back electromotive force, the control of the clutch or brake is very important.

In addition, reducing the reverse voltage means that an external discharge circuit is required, and at the same time it will extend the armature release time.
By using suitable back EMF absorptionThe circuit or protective element can balance the back electromotive force and the armature release time for regulation.
Generally speaking, the lower the back EMF drops, the lower the armature release
The longer the time will be, so it is important to set a suitable loop tolerance.
For electromagnetic clutches or brakes, diodes or variable resistors are generally used to absorb the back electromotive force. The specific conditions are explained in item 3.
In summary, the electromagnetic clutch or brake is a DC induced load, which is different from the common DC resistance load at the power supply device or control loop contact point.
At the same time, special treatment is required.

Measurement conditions

Consolidation tim

Stop time

Excitation voltage



Number of revolutions



Load torque



Moment of inertia