that offers a range of reliable, sub-fractional AC gearmotors and reducers for the food and beverage, packaging and material handling industries, has introduced IPMax, a line of lightweight, compact interior permanent magnet (IPM) gearmotors that are efficient with a wide synchronous speed
Brother Gearmotors, a division of Brother International Corporation that offers a wide range of ultra-reliable, sub-fractional AC gearmotors and reducers for the food & beverage, packaging and material handling industries, has introduced IPMax, a line of lightweight, compact interior permanent magnet (IPM) gearmotors that are highly efficient with a wide synchronous speed
range, according to the company.
To access the synchronous mode, the rotor of the motor must be accelerated to close to the synchronous speed
of rotation, after which to apply to the winding excitation DC, the rotor will become an electromagnet and will enter into synchronism.
By the DC supply the rotor get excited and rotates at synchronous speed
. The speed of the synchronous generator is determined by the frequency of the rotating field and by the number of pole pairs of the rotor.
Induction motors will experience a small degree of slip, but for simplicity, the analysis which follows will ignore slip, and synchronous speed
will be used.
With a single WT1800E, you can measure all the electrical power parameters along with rotation speed, torque, mechanical power, synchronous speed
, slip, motor efficiency, and total
The motor starts like a traditional design B induction motor and pulls into true synchronous speed
and operates as a true synchronous machine.
Three-phase induction machines are the machines with asynchronous speed which operate below synchronous speed
in motor mode and above synchronous speed
in generator mode .
In this condition, reference frame rotates with synchronous speed
; thus, variable coefficients change to constant ones.
Very large synchronous motors can be started unloaded with a VFD, brought up to synchronous speed
and then synchronized to the utility.
In this case, the supply frequency is determined according to the desired speed and the assumption that the motor will roughly follow its synchronous speed
. The error in speed resulted from slip of the motor is considered acceptable.