Magnet-Schultz motor Germany Magnet-Schultz model Magnet-Schultz price

Magnet-Schultz motors are AC motors that generate electromagnetic torque through the interaction between the rotating magnetic field in the air gap and the induced current in the rotor windings, thereby converting electrical energy into mechanical energy. Three-phase asynchronous motors are mainly used as motors to drive various production machinery, such as fans, pumps, compressors, machine tools, light industrial and mining machinery, threshers and crushers in agricultural production, and processing machinery for agricultural and sideline products, etc. They feature a simple structure, ease of manufacturing, low cost, reliable operation, durability, high operating efficiency, and suitable operating characteristics.

Magnet-Schultz motor structure

The motor can be regarded as a DC motor in which mechanical commutation is replaced by an electronic commutation device. It mainly consists of a synchronous motor body, a power electronic inverter, a rotor position detector, and a controller. The rotor of the synchronous motor is mainly composed of permanent magnets and magnetic conductors. The permanent magnet brushless DC motor mainly consists of a permanent magnet motor body, a rotor position sensor, and an electronic commutation circuit. In terms of both structure and control method, the permanent magnet brushless DC motor has many similarities to traditional DC motors: the rotor with permanent magnets replaces the stator poles of a brushed DC motor; the stator with multi-phase windings replaces the armature; and an electronic commutator composed of a solid-state inverter and a shaft position detector replaces the mechanical commutator and brushes.

Magnet-Schultz motor control method

Motor Direct Torque Control technology: Direct Torque Control (Direct Self-Control, DSC) constructs models of flux linkage and electromagnetic torque on the stationary stator coordinate system, achieving control of electromagnetic torque and stator flux linkage by applying different voltage vectors. The direct torque control method has advantages such as simple algorithms and good torque response. Therefore, it is widely used in applications requiring high transient torque response. Due to inherent disadvantages of the control, the direct torque control method has a low control frequency and large torque ripple at low speeds. Therefore, reducing torque ripple at low speeds has become a research hotspot in direct torque control methods. Sun Xiaohui and others achieved good results by optimizing the action time of voltage vectors to reduce torque ripple at low speeds. D.casadei and others applied the direct torque control method to the control of AC induction motors based on discrete space vector modulation technology, reducing torque ripple.

Magnet-Schultz motor classification

The motor swaps the stator and rotor of a conventional DC motor. Its rotor is a permanent magnet that generates air gap flux; the stator is the armature, composed of multi-phase windings. Structurally, it is similar to a permanent magnet synchronous motor. The stator structure of a brushless DC motor is the same as that of a conventional synchronous motor or induction motor. Multi-phase windings (such as three-phase, four-phase, five-phase, etc.) are embedded in the iron core. The windings can be connected in star or delta configurations and connected to the power transistors of the inverter for proper commutation. The rotor mostly uses rare-earth materials with high coercivity and high remanence density, such as samarium-cobalt or neodymium-iron-boron. Due to the different positions of the magnetic material in the magnetic poles, they can be classified as surface-mounted poles, embedded poles, and ring-shaped poles. Since the motor body is a permanent magnet motor, brushless DC motors are habitually referred to as permanent magnet brushless DC motors. Brushed DC motor: The 2 brushes (copper brushes or carbon brushes) of a brushed motor are fixed to the rear cover of the motor via an insulating seat, directly introducing the positive and negative poles of the power supply to the commutator of the rotor. The commutator connects the coils on the rotor, and the polarity of the 3 coils alternates continuously, interacting with the 2 fixed magnets on the housing to generate rotation. Since the commutator is fixed to the rotor and the brushes are fixed to the housing (stator), the brushes and commutator constantly friction against each other when the motor rotates, generating significant resistance and heat. Therefore, brushed motors have low efficiency and high losses. However, they also have the advantages of simple manufacturing and low cost.

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