Pupello motor Germany Pupello model Pupello price

Pupello motors are a new generation of gear reduction motors, featuring compact size, low noise, maintenance-free operation, and an attractive appearance. The speed ranges from 0.83r/min to 300r/min. This series of low-speed motors is a new high-tech product that integrates electromagnetic drive and reduction mechanisms within the motor housing. The low speed and high torque directly meet customer requirements without the need for additional reduction devices. The motors use Class B and Class F insulation, with protection ratings of IP44 and IP55, and voltages of 220V and 380V.

Pupello motor speed control

The motor is essentially a servo motor, consisting of a synchronous motor and a driver, and is a variable frequency speed control motor. A brushless DC motor with voltage-regulated speed control is a true brushless DC motor. It consists of a stator and a rotor. The stator has an iron core, and the coils use an "forward-reverse-forward-reverse..." winding configuration, thereby generating a fixed magnetic field of the N-S group. The rotor consists of a cylindrical magnet (with a shaft in the center) or is composed of an electromagnet with collector rings. This brushless DC motor can generate torque but cannot control direction. In any case, this motor is a very significant invention. When used as a DC generator, this invention can produce DC current with continuous amplitude, thereby avoiding the use of filter capacitors. The rotor can be permanent magnet, brushed excitation, or brushless excitation. When used as a large motor, this motor will generate self-inductance and requires protective devices.

Pupello motor applications

Static terminology for motors: Number of phases: the number of pairs of excitation coils that generate different pairs of N and S magnetic poles. Commonly expressed in m. Step count: the number of pulses or conducting states required to complete one periodic change of the magnetic field, expressed as n, or refers to the number of pulses required for the motor to rotate through one tooth pitch angle. Taking a four-phase motor as an example, the four-phase four-step operation mode is AB-BC-CD-DA-AB, and the four-phase eight-step operation mode is A-AB-B-BC-C-CD-D-DA-A. Step angle: the angular displacement of the motor rotor corresponding to one pulse signal, denoted by θ. θ = 360 degrees / (rotor teeth J * operating steps). Taking a conventional two-phase or four-phase motor with 50 rotor teeth as an example: in four-step operation, the step angle is θ = 360 degrees / (50 * 4) = 1.8 degrees (commonly known as full step); in eight-step operation, the step angle is θ = 360 degrees / (50 * 8) = 0.9 degrees (commonly known as half step). Detent torque: the locking torque of the motor rotor itself when the motor is not energized (caused by harmonics of the magnetic field tooth shape and mechanical errors). Static torque: the locking torque of the motor shaft when the motor does not rotate under rated static electrical action. This torque is a standard for measuring motor volume (geometric dimensions) and is independent of drive voltage and drive power supply. Although static torque is proportional to the ampere-turns of electromagnetic excitation and related to the air gap between the stator teeth and the rotor, excessively reducing the air gap and increasing excitation ampere-turns to improve static torque is not advisable, as this will cause motor heating and mechanical noise.

Pupello motor starting

The armature circuit resistance and inductance of the motor are small, while the rotating body has a certain mechanical inertia. Therefore, when the motor is connected to the power supply, the armature speed and the corresponding back EMF are very small at the beginning of starting, resulting in a large starting current. The maximum can reach 15 to 20 times the rated current. This current will disturb the power grid, cause mechanical shock to the unit, and cause sparking at the commutator. Therefore, direct switching starting is only suitable for motors with a power not greater than 4 kilowatts (starting current is 6 to 8 times the rated current). To limit the starting current, a specially designed variable resistor is often connected in series in the armature circuit; its principle wiring is shown in Figure 1. During the starting process, as the speed continues to rise, each section of resistance is short-circuited level by level in time, keeping the starting current within a certain allowable value. This starting method is called series resistance starting. It is very simple, the equipment is lightweight, and it is widely used in various small and medium-sized DC motors. However, due to the large energy consumption during the starting process, it is not suitable for motors that start frequently or for medium and large DC motors. But for certain special needs, such as urban trams which start frequently, in order to simplify equipment, reduce weight, and facilitate operation and maintenance, the series resistance starting method is usually adopted. For DC motors with larger capacity, reduced voltage starting is usually adopted. That is, a separate adjustable voltage DC power supply supplies power to the motor armature. Controlling the power supply voltage allows smooth motor starting and speed control. This method requires more complex power supply equipment.

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