BEM Models

These are compact power supplies for controlling spring-actuated brakes with rated voltages of 45 V DC/90 V DC/180 V DC. The direct current required to operate electromagnetic clutches and brakes can be obtained simply by connecting/inputting using AC 100, 200 or 400 V specifications.Since the entire case is molded of resin, they can be used in adverse environments and atmospheres, such as dusty locations, and they are compact and lightweight.



Input voltageAC100V± 10%
50/60 Hz
Maximum input voltage AC250V AC510V AC250V
Rectification method Rectification method Half-wave rectification Full-wave rectification
Output voltageDC45VDC90VDC45VDC90VDC180VDC90VDC180V
Output current When the ambient temperature is 20℃ Values in () are for an ambient temperature of 60℃ DC1.0A (DC0.6A) DC1.0A (DC0.6A) DC1.0A (DC0.6A)
Output Wattage When the ambient temperature is 20℃ Values in () are for an ambient temperature of 60℃45W (25W)90W (50W)45W (25W)90W (50W)180W (100W)90W (50W)180W (100W)
Size setting Voltage specification Numbers in parentheses are input voltagesDC45V (AC100V)DC90V (AC200V)DC45V (AC100V)DC90V (AC200V)DC180V (AC400V)DC90V (AC100V)DC180V (AC200V)
●: Applicable △: Applicable depending on clutch/brake model01
Applied clutches/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
1500 V AC, 50 Hz, 1 min. 2200 V AC, 50 Hz, 1 min. 1500 V AC, 50 Hz, 1 min.
Lead wireUL style / SizeUL3398・AWG22UL3271・AWG22UL3398・AWG22
Usage environment With no condensation -15~+60℃
Mass Per product 0.020 kg 0.021 kg 0.023 kg



[Terminals and Functions]

TerminalFunction nameFunction description
Leads (two)Input sideConnector for a commercial power supply
Tab terminals (two locations)Output sideConnector for an electromagnetic clutch or brake


Use of both half-wave rectification and full-wave rectification

BEM-2H/4H types take a commercial power supply as the input and generate a half-wave rectified DC voltage on the output side. These power supply devices are known for their very simple construction and low cost, but their voltage pulse is large. They are therefore prone to generating variations in operating response in electromagnetic clutches and brakes, they produce a howling noise when conducting, and they tend to generate more heat from their electromagnetic coils than full-wave rectified supplies or smoothing supplies. When the above are to be avoided, consider changing to a full-wave rectified supply (BEM-2F types), smoothing supply, or a DC 24 V specification. BEM-2F types generate a full-wave rectified DC voltage. These power supply devices are known for having smaller voltage pulses than halfwave rectified supplies and tending to have little variation in electromagnetic clutch and brake operating response. [Method for Calculating Output Voltage] Output voltage = Input voltage × a (a set coefficient) * a (set coefficient) = 0.45: half-wave rectified/0.9: full-wave rectified (Ex.) BEM-2H, -4H: 200 V AC×0.45 = 90 V DC BEM-2F: 100 V AC×0.9 = 90 V DC Note that the electromagnetic clutches and brakes will not operate at the performance specified by the specifications unless the output voltage calculated above and the rated voltage for the electromagnetic coil are the same.

[Wiring methods and Timing Charts]

Primary Control

Secondary Control