MADLER motor Germany MADLER model MADLER price

MADLER motors are devices that convert electrical energy into mechanical energy. They utilize energized coils (i.e., stator windings) to generate a rotating magnetic field, which acts on the rotor (such as a squirrel-cage closed aluminum frame) to form electromagnetic rotational torque. Motors are classified into DC motors and AC motors based on the power supply used. Most motors in power systems are AC motors, which can be synchronous or asynchronous (the speed of the stator magnetic field does not remain synchronized with the rotor rotation speed). A motor mainly consists of a stator and a rotor. The direction of motion of current-carrying conductors under force in a magnetic field is related to the direction of the current and the direction of magnetic field lines (magnetic field direction). The working principle of a motor is the force exerted by the magnetic field on the current, causing the motor to rotate.

MADLER motor working principle

The working principle of the motor is based on the DC series-wound motor. The principle is shown in Figure 1. The field winding and armature winding are connected in series to a DC power supply. Based on the direction of the main magnetic flux Φ and the armature current Ia, the direction of rotor rotation can be determined according to the left-hand rule; in a, it rotates counterclockwise. If the polarity of the power supply is reversed, as shown in Figure 1b, since it is a series-wound motor, both the main magnetic flux Φ and the armature current Ia change direction simultaneously. According to the left-hand rule, the rotor direction remains unchanged, still rotating counterclockwise. Therefore, when a single-phase AC voltage is applied to the series-wound motor, as shown in Figure 1c, although the power supply polarity changes periodically, the rotor maintains a constant direction of rotation. Thus, series-wound motors can be used with both AC and DC power supplies. Single-phase series-wound motors belong to single-phase AC asynchronous motors and are dual-use for AC and DC, so they are also called AC/DC dual-use series-wound motors. Due to their high speed, compact size, high starting torque, and adjustable speed, they can be used on both DC and single-phase AC power supplies, resulting in wide application in power tools. The motor mainly consists of three parts: stator, rotor, and bracket. The stator consists of salient pole iron cores and field windings. The rotor consists of non-salient pole iron cores, armature windings, commutators, and shafts. The field winding and armature winding form a series circuit through brushes and the commutator.

MADLER motor classification

Embedding short-circuit copper rings or short-circuit coils (groups) in part of the stator poles forms a shaded-pole single-phase motor. Shaded-pole single-phase motors include two types: salient pole and non-salient pole. When the stator winding is supplied with single-phase AC current, most of the pulsating magnetic flux generated couples directly to the rotor through the air gap, while a small portion of the flux generates induced flux when passing through the shaded-pole copper ring. This induced flux combines with the original flux and enters the rotor magnetic circuit through the air gap. According to Lenz's law, the induced flux always opposes the change in the original flux, and its phase lags behind the original flux. This creates two magnetic fluxes that are spatially offset by a certain angle and have a certain phase difference. The resulting magnetic field is a rotating magnetic field with significant ellipticity. The rotation direction of a shaded-pole motor is fixed, moving from the unshaded part to the shaded part. It has low power, low starting torque, simple structure, low price, and easy maintenance. Shaded-pole motors are generally used in small blower motors and fan motors.

MADLER motor advantages

Advantages of the motor: Compared with asynchronous motors, permanent magnet synchronous motors have much higher efficiency values under light load. Their high-efficiency operating range is wide, with efficiency greater than 90% in the range of 25% to 120%. The rated efficiency of permanent magnet synchronous motors can meet the Level 1 energy efficiency requirements of the current national standard, which is their greatest advantage in energy saving compared to asynchronous motors. In actual operation, motors rarely run at full power when driving loads. The reasons are: On one hand, designers generally determine motor power based on the extreme operating conditions of the load, but extreme conditions occur rarely. At the same time, to prevent motor burnout under abnormal conditions, a power margin is further reserved during design. On the other hand, motor manufacturers usually reserve a certain power margin beyond the user-required power to ensure reliability. This results in most actually operating motors working below 70% of their rated power, especially when driving fan or pump loads, where motors typically operate in the light load region. For asynchronous motors, light-load efficiency is very low, whereas permanent magnet synchronous motors can still maintain high efficiency in the light load region.

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