BEW(FH) Models

These are compact, high-capacity overexcitation power supplies that can be used in the full range of electromagnetic clutches and brakes of rated voltage 45 V DC/90 V DC/180 V DC.Using these as overexcitation power supplies provides benefits such as longer (roughly double) service lives for electromagnetic clutches and brakes and shorter (roughly halved) armature pull-in times. Using these as weak excitation power supplies provides benefits such as lower power consumption (roughly one-quarter), suppressed heat generation (roughly one-quarter) in the stator (electromagnetic coil), and shorter armature release times.

BEW (FH) Types


Input voltage100 V AC± 10% 50/60 Hz
200 V AC    
400 V AC
Input voltage range AC80 ~ 130V AC170 ~ 300V AC80 ~ 480V
Control method Overexcitation (full-wave rectified) for 0.5 sec followed by constant excitation (half-wave rectified)
OverexcitationConstant excitationOverexcitationConstant excitationOverexcitationConstant excitation
Output voltageDC90VDC45VDC180VDC90VDC360VDC180V
Output current When the ambient temperature is 20℃ values in () are for an ambient temperature of 60℃ DC1.6A (DC1.3A) Constant excitation 1.2 A DC (1.0 A DC) Constant excitation
Output capacity When the ambient temperature is 20℃ values in () are for an ambient temperature of 60℃ 72 W (58 W) Constant excitation 144 W (117 W) Constant excitation 216 W (180 W) Constant excitation
Size settings Purpose for useUsing overexcitationUsing weak excitationUsing overexcitationUsing weak excitationUsing overexcitationUsing weak excitation
Clutch/brake rated voltageDC45VDC90VDC90VDC180VDC180VDC360V
●: Applicable01
Applied cutches/brakes MIKI PULLEY electromagnetic-actuated
clutches and brakes Rated voltage DC 45/90/180 V
Spring-actuated brake
Insulating resistance Between terminal and body DC 500 V, 100 M Ω with Megger
2000 V AC, 50 Hz, 1 min.
Usage environment With no condensation -20℃ ~ +60℃
Mass Per product 0.065 kg



[Terminals and Functions]

Terminal symbolTerminal nameFunction description
1-2Power supply input terminalConnector for a commercial power supply
3-4Output terminalConnector for an electromagnetic clutch or brake
5-6Control terminalOutput is controlled by opening and closing between terminals with a relay or other contact


Used as Overexcitation Supplies

BEW(FH) models go through about 0.5 sec of full-wave rectified output and then transition to half-wave rectified output. BEW-FH power supply devices create an overexcitation state by matching their constant excitation voltage to the rated voltage of the electromagnetic clutch/brake to obtain the following effects.
• Longer electromagnetic clutch/brake service life (about double)
• Shorter armature pull-in time (about half) to achieve high frequency operation
• Longer service life (about double)
• Reduced startup interference by combined use of a spring-actuated brake and a motor
Also, the following effects can also be obtained by determining the specifications of the spring-actuated brake under the
assumption that a BEW-FH power supply will be used.
• Higher torque
• Thinner design and lighter weight

Use as a weak excitation power supply

Conversely to the above, matching the overexcitation voltage of the power supply unit to the rated voltage of the electromagnetic clutch and brake produces a weak excitation state after suctioning the armature and generates the below effects.
• Reduced power consumption (by approx. one-fourth)
• Decreased generation of heat (by approx. one-fourth) by the stator (electromagnetic coil)
• Slimmer and more compact

[Wiring methods and Timing Charts]

Primary Control

Secondary Control