Lafert’s offering of brake motors provide the option of wiring the electro-mechanical brake for simultaneous operation with the motor or separately by supplying a suitable separate power feed for the brake coil.
The AF and AMBZ models are furnished with three phase brake coils, with a separate terminal block in the connection box to power the brake. This allows the installer to put jumpers from the motor block to the brake’s block for simultaneous operation (i.e. when power is shut off for the motor, the brake engages at the same time to stop the motor) or the installer also has the option of providing a separate power feed for the brake coil only.
It is important to note that if the motor and brake coil are to be wired together to operate or stop at the same time, the power should be brought to the motor block first and then connected to the brake coil to avoid the inrush current of the motor being drawn through the coil.
If the brake is to be operated independently from the motor (i.e. motor is run via variable frequency drive), the brake coil terminal block can be wired from a separate feed. In this case, Lafert also offers a selection of different brake coil voltages to suit the most common applications as stock items that can be changed from standard as well as options for custom voltages per your request.
Lafert’s MS line of compact DC brake motors also offer the same options. As the brake coils in this series are DC rectified units, the standard coil supplied matches the motor voltage and is prewired on the motor block for simultaneous operation. As an option, the coil can be unwired from the motor block and fed separately from another suitable single phase source.
Standard 230/460V motors are supplied with a full wave rectifier and a 206VDC coil.
Standard 333/575V motors are supplied with a half wave rectifier and a 148VDC coil.
Alternate voltages are available from stock (24VDC, 51VDC, 103VDC) as well as custom voltages per your request.
Wiring diagrams and other information is available in our downloadable catalogue or you can contact our sales department with any other questions you may have.
Lafert offers a variety of different voltages on our standard motor, and choosing the right one will depend as much on what voltage is available for the application as well as how you are planning to start the motor.
Voltage combinations of 230/460V and 333/575V are the most common but in some of the larger horsepower motors we also offer 460/796V and 575/990V motors.
For starting the motor across the line, soft starts and variable frequency drives; choosing the motor that matches the running voltage of the motor is the right choice. By placing the jumpers on the terminal block in the correct configuration (illustrated by the supplied wiring diagram on the inside of the terminal box cover) you are then able to supply the power feed to the appropriate terminals.
If you are using a wye/delta starter, the 460/796V or 575/990V offerings are more appropriate as these are six lead windings and will allow the use of a wye/delta starter.
If a wye/delta start is being used at a lower voltage (i.e. 230V running voltage), a 230/460V motor would be desired. It is important in this case to advise our sales staff when ordering as we will have to ensure we are supplying a six lead motor as some of our premium efficiency motors come standard with a nine lead configuration which will not work with this starter.
Yes. In general, Lafert motors can be mounted vertically shaft up and down. Motors installed vertically must be protected from weather conditions.
Bearings of type designation "2Z" have two shields for each bearing which are pre-lubricated by the manufacturer. All bearings have clearance of (C3). Covers with grease lubricators can be supplied. All our bearings are pre-loaded axially with compensating rings of tempered steel. Frame sizes 180 - 315 have bearings that can be regreased; both drive and non-drive end shields are equipped with grease fittings.
It depends on the motors RPM and usage. Re-greasable bearings should be re-greased according to the recommendation in the manual of that particular motor.
Relubrication intervals for operating temperatures up to 70ºC (hours)
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On 56 and 63 frame motors, the junction box are F2 (right hand side when facing shaft, with non-removable feet).
The 71 to 160 frame motors have F2 mount but with removable feet so you can move the junction box in 90 degree increments.
180-315 frame motors have F0 (top mount).
It means that the motors are equipped with D-flange and feet.
Other descriptions are as follows: IM B3 = footed, IM B34 = C Face and footed.
Our 71 frame to 160 frame motors have removable feet.
Yes, we do offer all brake motors with the option of a flange mount (63 to 160 frame): B5 and B14 - as well as increased and reduced flanges in both designs.
All metric motors have a threaded hole inside the end shaft according to IEC standard.
Yes, in the larger motors we offer voltages of 460/796V and 575/990V, suitable for Y/Delta starting.
Yes. All three phase motors are inverter duty rated. Download our Product catalogue at www.lafertna.com/products to see specific inverter duty ratings for each product group.
For 575V motors on Inverters, we do require a load reactor to safe guard the motor.
Lafert motors with a voltage of 230/460 are capable of running at 208V. In a low voltage connection, the motors have a 10% variance in voltage allowing as low as 207V supply.
If you require a 208 +/- 10%, you will need us to provide you with a special build unit.
The full load amperage is always listed on the motor's name plate.
All 3-phase motors are capable of running at 50/60Hz. Some units are pre-rated from the factory, others can have it added as required.
All of our motors are equipped with bidirectional fans.
Yes, Lafert offers motors from stock with voltage options of 333/575V and 575/990V.
Lafert is capable of modifying motors to different voltages, HP and/or frequencies based on application, duty cycle, ambient temperature and service factor required. We can also custom build to most any request.
Lafert offers both AC and DC brake options, as well as custom brake voltages as per customer request.
Our stator windings are made out of copper. The rotor cage is made out of aluminum alloy, or cast iron.