Hysteresis Brake

Product name：LB series hollow shaft hysteresis brake

Based on the standard hysteresis brake, the bearing and core shaft device are removed, and a fixed hole is added to the rotor to provide constant tension control for the passive unwinding of the wire.

Product Details

Working principle
　　The hysteresis effect in magnetism is applied to torque control by using two basic components, a mesh pole structure and a special steel rotor/shaft assembly are installed together, but not in physical contact. Before the pole structure is energized, the towing cup can rotate freely on its bearings. When the magnetizing force from the excitation coil is applied to the pole structure, the air gap becomes a magnetic flux field and the rotor is magnetically confined, thereby providing braking or clutching between the pole structure and the rotor.
　　The superior design of these hysteresis devices provides several inherent advantages over magnetic particles and friction devices. They operate under frictionless design principles with little wear. This has the following advantages: longer life expectancy, better torque repeatability, life cycle cost advantage, wide speed range, excellent environmental stability and excellent operational fluency.

　　In current-controlled hysteresis brakes, torque adjustment and control is provided by the excitation coil. This allows full control of the torque by adjusting the DC current of the excitation coil. Adjustable from a minimum value (bearing resistance) to a maximum value of 10-20% above the rated torque. These brakes use the same working principle as our permanent magnet hysteresis brakes, but the magnetic field is replaced with a magnetic field coil, which provides the precise magnetic field strength required for the rated torque.

　　Residues than the magnetic force:

　　residual magnetism when the field current is suddenly changed less than 50% of the initial value and is not generated when the rotor is rotated, the torque fluctuation will occur during operation. Effective methods to avoid torque fluctuations are:
　　• Manually turn the stator and rotor separately while gradually reducing the excitation current
　　• Gradually reduce the excitation current
　　before the equipment is shut down • Disconnect the low excitation current before the equipment is shut down (between the stator and the rotor) Relative speed is above 100 rpm)

　　Specification parameter table of LB series hollow shaft hysteresis brake:

Model	Rated torque	Rated current	Voltage	Coil resistance (At 25℃±10%)	Weight	Rated slip power		Peak speed
	Rated torque	Rated current	Voltage	Coil resistance (At 25℃±10%)	Weight	5 minutes	continued	Peak speed
	kg·cm	mA	VDC	Ω	kg	watts	watts	rpm
LB-202	2	200	24	120	0.41	75	20	5000
LB-302	3	390	24	62	0.9	120	35	5000
LB-502	5	390	24	62	0.9	120	35	5000
LB-103	10	400	24	60	1.70	320	80	3000
LB-203	20	315	24	76	3.40	460	115	3000
LB-303	30	1200	24	20	5.12	680	165	2500
LB-503	50	1200	24	20	9.30	1000	200	2000
LB-114	100	1200	24	20	22.0	1200	350	1800
LB-124	120	1200	24	20	22.0	1200	350	1800

　　Typical application-hollow shaft hysteresis brake

　　The hollow shaft brake is installed in an optical fiber stranding machine to control the tension of the packaging material.

　　Flywheel control: The brake electrode/housing is composed of bolts fixed on the frame, and the hollow shaft with bearings is installed in the electrode. The hollow shaft, rotor and flywheel form an assembly to tighten the winding material.

Last：Blower Cooled Hysteresis Brake

Next：MHB series matching hysteresis brake

We'd like to hear your opinion

Whether you want to know us or have any suggestions, we will be glad to hear from you.