Nord Drivesystems motor, German Nord Drivesystems model, Nord Drivesystems price

Nord Drivesystems motor refers to a low-power single-phase asynchronous motor powered by a single-phase AC power supply (AC220V). This type of motor typically has two-phase windings on the stator, and the rotor is of the standard squirrel-cage type. Different distributions of the two-phase windings on the stator and different power supply conditions can produce different starting and operating characteristics.

Nord Drivesystems motor classification

The motor swaps the stator and rotor of a standard DC motor. Its rotor is a permanent magnet that generates air gap flux; the stator is the armature, composed of multi-phase windings. Structurally, it is similar to a permanent magnet synchronous motor. The stator structure of a brushless DC motor is the same as that of a standard synchronous or induction motor. Multi-phase windings (such as three-phase, four-phase, or five-phase) are embedded in the iron core. The windings can be connected in star or delta configurations and are respectively connected to the power transistors of the inverter for proper commutation. The rotor often uses rare-earth materials with high coercivity and high remanence, such as samarium-cobalt or neodymium-iron-boron. Due to the different positions of the magnetic material in the magnetic poles, they can be classified as surface-mounted poles, embedded poles, and ring-shaped poles. Since the motor body is a permanent magnet motor, brushless DC motors are also commonly referred to as permanent magnet brushless DC motors. Brushed DC motor: The 2 brushes (copper or carbon brushes) of a brushed motor are fixed to the rear cover of the motor via an insulating seat, directly introducing the positive and negative poles of the power supply to the commutator on the rotor. The commutator connects the coils on the rotor, and the polarity of the 3 coils alternates continuously, interacting with the 2 fixed magnets on the housing to generate rotation. Since the commutator is fixed to the rotor and the brushes are fixed to the housing (stator), friction between the brushes and the commutator during motor operation generates significant resistance and heat. Therefore, brushed motors have low efficiency and high losses. However, they also have the advantages of simple manufacturing and low cost.

Nord Drivesystems motor applications

Applications of motors in precision machining: To improve productivity and enhance machining quality, ultra-high-speed and ultra-high-precision machining are key. Currently, the feed speed requirements for CNC machine tools have increased from 6–8m/min to greater than 50–60m/min, with acceleration requirements reaching 1–5g. This performance indicator cannot be achieved by traditional feed drive systems with intermediate transmission and conversion stages, necessitating the search for a new actuator. This has led to the emergence of the new generation of linear motor feed drive systems. Since the end of the 20th century, major international machine tool exhibitions worldwide have shown that the direct application of linear motors to CNC machine tools, machining centers, and presses is a trend. Linear motor drives feature high thrust, high speed, high precision, and smooth feed motion. Machine tool feed systems use direct drive by linear synchronous motors. The main difference from the original rotary motor transmission method is the elimination of the mechanical intermediate transmission stage between the motor and the worktable (slide), effectively reducing the length of the machine tool feed transmission chain to zero. Hence, this transmission method is called "direct drive" or "zero transmission." Direct drive avoids disadvantages such as backlash, inertia, friction, and insufficient rigidity associated with lead screw transmission, bringing performance indicators and advantages unattainable with original rotary motor drive methods.

Nord Drivesystems motor performance

The design of the motor spindle shaft end is also a critical issue for high-speed electric spindles. Bearing selection and preload technology for electric spindles: Bearings used in high-speed spindle units mainly include angular contact ball bearings, magnetic bearings, water-based hydrostatic/hydrodynamic bearings, and air hydrostatic/hydrodynamic bearings. Due to their high cost, complex control systems, and difficult-to-resolve heating issues, magnetic bearings are not yet widely applied in high-speed spindle units. Water-based hydrostatic bearings are a popular research topic in China; they leverage the high heat capacity of water and lower bearing temperature rise to partially address the severe heating problems of standard hydrodynamic/hydrostatic bearings, making them mainly suitable for low-speed, heavy-load applications. Air hydrostatic/hydrodynamic bearings have low radial stiffness and are subject to impact, but offer good high-speed performance, generally used in ultra-high-speed, light-load, precision spindles. Angular contact ball bearings with a dn value are used in the following high-speed spindle units. They meet requirements well in terms of speed limit, load capacity, stiffness, and precision, are standardized, and are low-cost. The performance of angular contact ball bearings can also be improved by the following methods.

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