sirem motor Germany sirem model sirem price

sirem motor refers to a motor that can operate on both DC and AC power supplies. This type of electric motor is widely used in household appliances, manual devices, computing tools, and precision machinery. In addition, this type of motor is frequently used in medical equipment, communication technology, measurement technology, the film industry, and many other areas.

sirem 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 (three-phase, four-phase, five-phase, etc.) are embedded in the iron core. The windings can be connected in star or delta configuration and connected to the power transistors of the inverter respectively 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 into surface-mounted poles, embedded poles, and ring-shaped poles. Since the motor body is a permanent magnet motor, brushless DC motors are also commonly 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 motor rear cover via an insulating seat, directly introducing the positive and negative poles of the power supply to the commutator on the rotor. The commutator connects the coils on the rotor, and the 3 coils continuously alternate polarity, 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), friction between the brushes and the commutator occurs continuously during motor rotation, 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.

sirem motor starting methods

Motor starting methods: First, split-phase starting, which uses an auxiliary starting winding to assist startup. Its starting torque is not high. The operating speed remains roughly constant. It is mainly applied in electric fans, air conditioner fan motors, washing machines, and other motors. Second, when the motor is stationary, the centrifugal switch is closed. Upon powering up, the start capacitor participates in the starting process. When the rotor speed reaches 70% to 80% of the rated value, the centrifugal switch automatically opens, the start capacitor completes its task and is disconnected. The starting winding does not participate in operation, and the motor continues to operate using the running winding coil. Third, when the motor is stationary, the centrifugal switch is closed. Upon powering up, the start capacitor participates in the starting process. When the rotor speed reaches 70% to 80% of the rated value, the centrifugal switch automatically opens, the start capacitor completes its task and is disconnected. The run capacitor is connected in series with the starting winding to participate in operation. This connection method is generally used in places with heavy and unstable loads, such as air compressors, cutting machines, and woodworking machine tools, as shown in Figure C. For motors with a centrifugal switch, if the motor fails to start successfully within a short time, the winding coils will quickly burn out. Capacitance values: Dual-value capacitor motors have a large start capacitor capacity and a small run capacitor capacity, with a voltage rating generally greater than 400 V. Forward and reverse control: Usually, the resistance values of the starting winding and the running winding of this type of motor are the same, meaning the wire diameter and number of turns of the starting winding and running winding are completely identical. This type of motor is generally used in washing machines. This forward and reverse control method is simple and does not require complex changeover switches. For forward and reverse control, simply swap the 1 to 2 wires or swap the 3 to 4 wires to achieve reversal. Identification of starting and running windings: Usually, the DC resistance of the starting winding is much larger than that of the running winding, which can be measured with a multimeter. Generally, the DC resistance of the running winding is a few ohms, while the DC resistance of the starting winding is tens to hundreds of ohms.

sirem motor applications

The motor stator generates a stationary magnetic field. This stationary magnetic field surrounds the armature (or rotor). An external power supply excites the armature magnetic field. A brushed DC motor also has two arc-shaped copper pieces on the motor shaft, called commutator segments. When the motor rotates, carbon brushes slide on the commutator. This generates a rotating magnetic field that attracts the stationary magnetic field of the stator. The current in the armature and stator windings is supplied by batteries or other DC power sources (permanent magnet brushed DC motors do not have stator windings). The battery (or DC power supply) provides a constant DC voltage. The voltage amplitude determines the motor speed, so the battery or DC power supply is a linear excitation source. The most effective way to change the speed of a brushed DC motor is to use pulse width modulation (pwm) technology. pwm technology switches a constant voltage source at a fixed frequency. Changing the pulse width of the pwm signal adjusts the motor speed. The ratio between the high and low levels of the pulse is called the duty cycle of the pwm signal. The amplitude of the DC battery level equals the average amplitude of the pwm signal. Brushed DC motors have good starting and speed regulation performance and are often applied in situations with high requirements for starting and speed regulation, such as large reversible steel rolling mills, mine hoists, high-speed elevators in hotels, gantry planers, electric locomotives, internal combustion locomotives, city trams, subway trains, electric bicycles, papermaking and printing machinery, marine machinery, large precision machine tools, and large cranes.

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