FANDIS motor Germany FANDIS model FANDIS price

FANDIS motors are rotating machines containing a brush assembly that convert DC electrical energy into mechanical energy (DC motors) or mechanical energy into DC electrical energy (DC generators). Unlike brushless DC motors, the brush assembly is used to introduce or extract DC voltage and current. DC brushed motors are the foundation of all motors; they feature fast starting, timely braking, smooth speed regulation over a wide range, and relatively simple control circuits.

FANDIS motor classification

The motor rotor is made with salient poles, and the field coils mounted on the pole cores are connected in series, arranged with alternating opposite polarities, and have two lead wires connected to two slip rings mounted on the shaft. The field coils are excited by a small DC generator or a battery. In most synchronous motors, the DC generator is mounted on the motor shaft to supply the excitation current to the rotor pole coils. Since this type of synchronous motor cannot start automatically, a squirrel-cage winding is installed on the rotor for starting purposes. The squirrel-cage winding is located around the periphery of the rotor, with a structure similar to that of an induction motor. When three-phase AC power is applied to the stator windings, a rotating magnetic field is generated within the motor. The squirrel-cage winding cuts the magnetic flux lines, generating induced current, which causes the motor to rotate. After the motor starts rotating, its speed gradually increases to slightly below the speed of the rotating magnetic field. At this point, the rotor field coils are excited by DC current, forming specific magnetic poles on the rotor. These poles attempt to track the rotating magnetic poles of the stator, thereby increasing the rotor speed until it rotates synchronously with the rotating magnetic field.

FANDIS motor speed control

Motor pole-changing speed control: This method achieves speed control by changing the wiring configuration of the stator windings to alter the number of pole pairs in the stator of a squirrel-cage motor. Variable frequency speed control changes the frequency of the power supply to the motor stator, thereby altering its synchronous speed. The main equipment in a variable frequency speed control system is the inverter, which provides variable frequency power. Inverters can be divided into two categories: AC-DC-AC inverters and AC-AC inverters. In China, AC-DC-AC inverters are predominantly used. Cascade speed control involves inserting an adjustable additional electromotive force (EMF) into the rotor circuit of a wound-rotor motor to change the motor's slip, achieving speed control. Most of the slip power is absorbed by the inserted additional EMF and then returned to the grid or converted for utilization using auxiliary devices. Based on the method of absorbing and utilizing slip power, cascade speed control can be classified into motor cascade speed control, mechanical cascade speed control, and thyristor cascade speed control, with thyristor cascade speed control being the most commonly adopted. For wound-rotor induction motors, adding external resistance to the rotor circuit increases the motor's slip, causing the motor to operate at a lower speed. The greater the inserted resistance, the lower the motor speed. This method features simple equipment and convenient control, but the slip power is dissipated as heat in the resistors. It belongs to stepped speed control, and the mechanical characteristics are relatively soft. When the stator voltage of the motor is changed, a set of different mechanical characteristic curves can be obtained, resulting in different speeds. Since the motor torque is proportional to the square of the voltage, the maximum torque decreases significantly, resulting in a narrow speed control range, which makes it difficult to apply this method to general squirrel-cage motors. To expand the speed control range, voltage-regulation speed control should employ squirrel-cage motors with high rotor resistance, such as torque motors specifically designed for voltage-regulation speed control, or connect frequency-sensitive resistors in series with wound-rotor motors. To expand the stable operating range, feedback control should be adopted for automatic speed regulation when speed control exceeds 2:1. The main device for voltage-regulation speed control is a power supply capable of varying the voltage. Common voltage regulation methods include series-connected saturated reactors, autotransformers, and thyristor voltage regulation, with thyristor voltage regulation being the optimal method.

FANDIS motor performance

Motors are also known as motors that rotate at synchronous speed. The rotor is attracted and rotated by the surrounding rotating magnetic field generated by the applied AC current. It rotates synchronously with the speed difference between the rotating magnetic field generated by the AC current and the magnetic field generated by the armature current. Open-loop speed control is possible. Without additional measures, it cannot start rotating from a standstill. Induction motors within permanent magnet synchronous motors are more efficient. If the frequency of the electrical power applied during startup is high, the stationary rotor will not be able to follow and will not rotate on its own. Therefore, if the drive power source is not frequency-controlled, a separate starting motor can be provided, or other types of motors with built-in mechanisms can be used. Semiconductors offer high controllability via inverters, integrated with the control circuit.

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