1.What is a linear motor?
Linear motors are electric induction motors that produce motion in a straight line rather than rotational motion. In a traditional electric motor, the rotor (rotating part) spins inside the stator (static part); in a linear motor, the stator is unwrapped and laid out flat and the "rotor" moves past it in a straight line. Linear motors often use superconducting magnets, which are cooled to low temperatures to reduce power consumption. 2.What are the benefits of a linear motor?
Linear motors are also referred to as direct drive units, since the load is directly coupled to the motor. This eliminates the
need for elastic components such as gearboxes and couplings, which introduce backlash and error in the motion. And because they do not rely on mechanical drive components such as ball screws, belts, and rack and pinions, linear motors have a much higher accuracy and repeatability, with no velocity ripple.This lack of rotating or recirculating parts also makes them virtually maintenance-free and contributes to a lower total cost of ownership when compared to traditional drive mechanisms.
3.What is an Iron Core motor?
An Iron Core motor is a linear motor which is designed and constructed with an iron core. In iron core linear motors, the windings are mounted in an iron lamination stack. The number and length of the windings determine how much force the motor can produce.Based on the magnetic attraction, between the iron of the primary and the permanent magnets of the secondary, plus the magnetic force created in the windings. These linear motors offer extremely high continuous force for their size, starting at 60N for the small TM, all the way up to 3000N for the water cooled TBW powerhouse. Peak forces are even higher, reaching up to 6000N. With high continuous forces and good heat dissipation, iron core linear motors are ideal for pressing, molding, and machining applications.
4.What is done to reduce the cogging effect of Iron Core motors?
To reduce cogging in Iron Core linear motors, Tecnotion has taken two measures. First, the magnet plate is constructed with a skewed magnet arrangement that smooths out the movement of the iron core. Second, Tecnotion Iron Core motors use a proprietary coil laminate that is specifically designed to reduce cogging.
5.What is cogging?
The permanent magnets produce an attraction force to all magnetic materials. Cogging is an result of the iron core motor design. The iron core has “preferred” positions relative to the magnets, and the motor must vary its thrust force to overcome these positions. This results in a motion that is less smooth than that of an ironless linear motor, and can be compared to moving over an old-fashioned washboard.