Unitec AG motor, German Unitec AG model, Unitec AG price

Unitec AG motor is a discrete-value control motor that converts electrical pulse excitation signals into corresponding angular or linear displacement. This motor moves one step for each input electrical pulse, so it is also called a pulse motor. It is a special micro-motor that converts electrical pulse signals into angular displacement to control rotor rotation. It serves as an actuator in automatic control devices. For each input pulse signal, the stepper motor advances one step, hence it is also known as a pulse motor. Stepper motors are widely used in peripheral equipment of digital computers, as well as in printers, plotters, and disk drives. The drive power supply for stepper motors consists of a variable-frequency pulse signal source, a pulse distributor, and a pulse amplifier, which provide pulse current to the motor windings. The operating performance of a stepper motor depends on the good coordination between the motor and the drive power supply. The advantages of stepper motors include no cumulative error, simple structure, convenient use and maintenance, low manufacturing cost, and high ability to drive load inertia. They are suitable for small and medium-sized machine tools and applications with low speed and precision requirements. The disadvantages include lower efficiency, significant heat generation, and occasional "step loss".

Unitec AG motor structure

The motor mainly consists of components such as the rotor, end covers, and stator. The stator structure of a permanent magnet synchronous motor is very similar to that of a conventional induction motor. The main difference in the rotor structure compared to an asynchronous motor is the presence of high-quality permanent magnet poles on the rotor. Depending on the placement of the permanent magnets on the rotor, permanent magnet synchronous motors are usually divided into surface-mounted rotor structures and interior rotor structures. The placement of permanent magnets has a significant impact on motor performance. Surface-mounted rotor structure: The permanent magnets are located on the outer surface of the rotor core. This rotor structure is simple but produces very little asynchronous torque, making it suitable only for applications with low starting requirements; it is rarely used. Interior rotor structure: The permanent magnets are located in the core between the squirrel-cage bars and the shaft. This structure offers good starting performance, and the vast majority of permanent magnet synchronous motors adopt this design.

Unitec AG motor classification

Motor classification: 1. Hydraulic motor: Conventionally refers to an energy conversion device that outputs rotary motion, converting hydraulic energy provided by a hydraulic pump into mechanical energy. 2. High-speed motor: Gear motors have advantages such as small size, light weight, simple structure, good manufacturability, insensitivity to oil contamination, shock resistance, and low inertia. Disadvantages include large torque ripple, lower efficiency, low starting torque (only 60%–70% of rated torque), and poor low-speed stability. 3. Vane motor: A hydraulic motor in which vanes in the rotor slots contact the housing (stator ring), causing the rotor to rotate under the action of incoming fluid. Compared with other types of motors, vane motors have advantages such as compact structure, smaller outline dimensions, low noise, and long service life. Their inertia is smaller than that of piston motors, but their contamination resistance is worse than that of gear motors. The speed cannot be too high, generally operating below 200r/min. Due to significant leakage, vane motors are unstable under load changes or at low speeds. 4. Radial piston motor: Has good reverse characteristics, allowing absolutely quiet motor operation, suitable for servo systems. Can operate bidirectionally as a motor or pump. 5. Axial piston motor: A cycloidal hydraulic motor with shaft distribution supported by rolling bearings. It adopts an integrated design of the output shaft and distribution mechanism, inserted-tooth stator and rotor, rolling bearing support at both ends, and specialized imported rotating seals, allowing the motor to operate under higher back pressure. 6. Low-speed hydraulic motor: Simple structure, reliable operation, wide variety of specifications, and low price. Its disadvantages include larger volume and weight, and significant torque ripple. 7. Cycloidal motor: A small, low-speed, high-torque hydraulic motor with internal meshing cycloidal gears. It has a simple structure, good low-speed performance, and strong short-term overload capacity. Inside the cycloidal motor, there is a stator and a moving vane. The stator, vane, and drive shaft divide the motor into two chambers, each with an oil port. When one port admits oil, the other discharges it, and the incoming oil pushes the vane to swing. 8. Piston pneumatic motor: Composed of connecting rods, crankshaft, pistons, cylinders, body, and air distribution valve. Compressed air supplies each cylinder sequentially through the air distribution valve, expanding to perform work and pushing the crankshaft to rotate via the connecting rods. Its power mainly comes from the work of gas expansion.

Unitec AG motor working principle

The motor stator winding is powered by a single-phase supply, and the rotor is an armature winding with a commutator short-circuited by brushes. The brushes can be moved to any position relative to the stator winding as needed. By moving this position, the direction of rotation, mechanical characteristics, and operating speed of the rotor can be changed. When the brushes deviate counterclockwise from the geometric neutral axis, the rotor rotates clockwise; when the brushes deviate clockwise from the geometric neutral axis, the rotor rotates counterclockwise. Because the direction of rotation is opposite to the direction of brush deviation, it is called a repulsion motor. It has mechanical characteristics similar to those of a series-wound DC motor and is used to drive mechanical loads with heavy starting requirements. It is suitable for single-phase power supply applications requiring speed adjustment and reversal. Some motors are equipped with overload protection devices to protect the motor from burnout due to excessive current during overload. This component, made of bimetal, expands when heated to open the contacts and break the circuit. When the overload is removed and the motor cools down, the contacts close again. The rotor coil is connected to the commutator and is not connected to the external circuit. The short-circuited brushes press against the commutator, angled relative to the central axis of the stator magnetic field. When energized, the stator magnetic field induces an armature field in the armature. The poles of this field are near the brushes. The polarity of the armature field at this location is the same as that of the adjacent stator pole, generating mutual repulsion that causes the armature to rotate.

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