OPTIBELT motor Germany OPTIBELT model OPTIBELT price

OPTIBELT 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 mechanism within the motor housing. The low speed and high torque directly meet customer requirements without the need for additional reduction devices. The motor uses Class B insulation, Class F insulation, with protection ratings of IP44 and IP55, and voltages of 220V and 380V.

OPTIBELT motor structure

The motor consists of stator poles, rotor, brushes, housing, and other components. The stator poles use permanent magnets (permanent magnetic steel), made of materials such as ferrite, AlNiCo, and NdFeB. Depending on the structural form, they can be classified into cylindrical and tile types. The rotor is generally made of laminated silicon steel sheets, with enameled wire wound between two slots of the rotor core (three slots mean three windings), and each connection is soldered to the metal segments of the commutator. Brushes are conductive components connecting the power supply to the rotor windings, possessing both conductivity and wear resistance. Permanent magnet motors use single-metal strip brushes, metal-graphite brushes, or electrographite brushes. 2. Brushless DC motor: Composed of a permanent magnet rotor, multi-pole winding stator, position sensors, etc. The characteristic of brushless DC motors is the absence of brushes; they use semiconductor switching devices (such as Hall elements) to achieve electronic commutation, replacing traditional contact commutators and brushes. They offer advantages such as high reliability, no commutation sparks, and low mechanical noise. Position sensors commutate the current in the stator windings in a specific order according to changes in rotor position (i.e., detecting the position of rotor poles relative to the stator windings, generating position sensor signals at determined positions, which are processed by signal conversion circuits to control the power switch circuit and switch winding currents according to a specific logical relationship). There are three types of position sensors: magnetic, photoelectric, and electromagnetic. In brushless DC motors using magnetic position sensors, magnetic sensing devices (such as Hall elements, magnetic diodes, magnetic transistors, magnetic resistors, or dedicated integrated circuits) are mounted on the stator assembly to detect changes in the magnetic field generated by the rotation of the permanent magnet rotor. Hall elements are commonly used in electric vehicles. In brushless DC motors using photoelectric position sensors, photoelectric sensing devices are configured at specific positions on the stator assembly, and a light-blocking plate is installed on the rotor, with the light source being an LED or a small bulb. As the rotor rotates, the light-blocking plate causes the photosensitive components on the stator to intermittently generate pulse signals at a certain frequency. In brushless DC motors using electromagnetic position sensors, electromagnetic sensor components (such as coupling transformers, proximity switches, LC resonant circuits, etc.) are installed on the stator assembly. When the position of the permanent magnet rotor changes, the electromagnetic effect causes the electromagnetic sensor to generate high-frequency modulated signals (whose amplitude varies with rotor position). The operating voltage of the stator windings is provided by an electronic switch circuit controlled by the output of the position sensor.

OPTIBELT motor control method

Constant V/f control method for motors: The constant voltage-to-frequency ratio control method for permanent magnet synchronous motors is similar to that for AC induction motors. It controls the amplitude and frequency of the motor input voltage to change simultaneously, thereby keeping the motor flux constant. The constant V/f control method can meet the requirements of wide-range speed regulation systems. Without feeding back physical signals such as current, voltage, or position, it can still achieve a certain level of control accuracy, which is the greatest advantage of the constant V/f control method. The constant V/f control method features simple control algorithms and low hardware costs, and has been widely used in the field of general-purpose variable frequency drives. The disadvantages of the constant V/f control method are also obvious. Since there is no feedback of speed, position, or any other signals during the control process, it is almost impossible to obtain information on the operating status of the motor, let alone precisely control the rotational speed or electromagnetic torque. The system performance is average, and the dynamic response is poor, especially when the target speed changes or the load undergoes sudden changes, problems such as step-out and oscillation are prone to occur. Obviously, this control method cannot separately control torque and excitation current, and large excitation currents tend to exist during the control process, affecting the efficiency of the motor. Therefore, this control method is commonly used in general-purpose variable frequency drives with lower performance requirements, such as air conditioners, conveyor belt drive control in production lines, and energy-saving operation of water pumps and fans.

OPTIBELT motor performance

Motor performance is closely related to its excitation method. Typically, there are 4 excitation methods for DC motors: separately excited DC motor, shunt-excited DC motor, series-excited DC motor, and compound-excited DC motor. Understand the characteristics of these 4 methods: 1. Separately excited DC motor: The field winding has no electrical connection with the armature, and the field circuit is supplied by a separate DC power source. Therefore, the field current is not affected by the armature terminal voltage or armature current. 2. Shunt-excited DC motor: The circuit is parallel, with current division. The voltage across the shunt winding is the same as the voltage across the armature. However, the shunt winding is wound with thin wire and has many turns, resulting in high resistance, which keeps the field current passing through it small. 3. Series-excited DC motor: The current is in series, with voltage division. The field winding is connected in series with the armature, so the magnetic field inside this motor changes significantly with changes in armature current. To prevent large losses and voltage drops in the field winding, the resistance of the field winding should be as low as possible. Therefore, series-excited DC motors are usually wound with thicker wire and have fewer turns. 4. Compound-excited DC motor: The motor's flux is generated by the field currents in two windings.

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