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clutch,Printer clutch, copier clutch

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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 coil
The residual energy in the medium 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 open switch contact, causing damage to the circuit contact and semiconductor components, and the 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.

Measurement items Standard value provisional No.1 provisional No.2 provisional No.3
Measurements Decision Measurements Decision Measurements Decision
Coil resistance 225.6Ω±10% 220.0Ω pass 224.0Ω pass 226.8Ω pass
Insulation resistance At DC 500V Meger 100MΩ or more OK pass OK pass OK pass
Insulation withstand voltage AC 1200V 1sec OK pass OK pass OK pass
Static friction torque 0.245 Nm or higher 0.42Nm pass 0.26Nm pass 0.48Nm pass
Gear idle torque 0.03 Nm or less 0.0017Nm pass 0.0015Nm pass 0.0017Nm pass

Field idle torque


0.06Nm or less 0.0032Nm pass 0.0028Nm pass 0.0032Nm pass
Field idle torque (Unexcitation) 0.03Nm or less 0.0020Nm pass 0.0020Nm pass 0.0018Nm pass
Consolidation time 15ms or less 4.7~7.5ms pass 6.5~8.7ms pass 5.7~10.3ms pass
Stop time 25ms or less 2.9~4.3ms pass 2.3~4.1ms pass 2.5~3.8ms pass
Operation and rotation No anomaly OK pass OK pass OK pass
Decision pass pass pass

Measurement conditions


  Consolidation time Stop time
Excitation voltage 22.8V 26.4V
Number of revolutions 60.5r/min
Load torque 0.06Nm
Moment of inertia J=0.125×10-4kgm2以下