Lafertgroup motor Germany Lafertgroup model Lafertgroup price

The Lafertgroup motor has a set of adjustable eccentric weights installed at each end of the rotor shaft, utilizing the centrifugal force generated by the high-speed rotation of the shaft and eccentric weights to obtain excitation force. Vibration motors have a wide vibration frequency range; only when the excitation force and power are properly matched can mechanical noise be reduced. Vibration motors are classified into six categories, including classification by starting and operating mode, and by operating speed.

Lafertgroup motor maintenance and upkeep

Preparation and inspection before motor start-up: Check whether the grounding of the electric motor and starting equipment is reliable and complete, and whether the wiring is correct and in good condition. Check whether the voltage and frequency indicated on the motor nameplate match the power supply voltage and frequency. For newly installed motors or those that have been idle for a long time, check the phase-to-phase and phase-to-ground insulation resistance of the windings before start-up. The insulation resistance should be greater than 0.5 megohms; if it is lower than this value, the windings must be dried. For wound-rotor motors, check whether the brush assembly on the collector rings works properly and whether the brush pressure meets requirements. Check whether the motor rotates flexibly and whether the oil in the sliding bearings has reached the specified level. Check whether the rated current of the fuses used for the motor meets requirements. Check whether all fastening bolts and mounting bolts of the motor are tightened. After all the above inspections meet the requirements, the motor can be started. After the motor starts, run it under no-load for about 30 minutes, observing carefully for any abnormalities. If abnormal conditions such as noise, vibration, or overheating are found, take measures to eliminate them before putting the motor into operation. When starting a wound-rotor motor, connect the starting rheostat into the rotor circuit. For motors with a brush-lifting mechanism, lower the brushes, disconnect the short-circuiting device, close the stator circuit switch, and adjust the rheostat. When the motor approaches rated speed, lift the brushes, close the short-circuiting device, and the motor start-up is complete.

Lafertgroup motor structure

A motor can be regarded as a DC motor in which electronic commutation replaces mechanical commutation. 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. A 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, permanent magnet brushless DC motors share many similarities with traditional DC motors: the rotor equipped 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.

Lafertgroup motor principle

A stepper motor is an open-loop control component that converts electrical pulse signals into angular or linear displacement. Under non-overload conditions, the motor's speed and stopping position depend solely on the frequency and number of pulses, unaffected by load variations; that is, each pulse signal causes the motor to rotate by one step angle. The existence of this linear relationship, combined with the characteristic that stepper motors have only periodic errors without cumulative errors, makes control in applications such as speed and position very simple. Although stepper motors are widely used, they cannot be used under conventional conditions like ordinary DC or AC motors. They require a control system composed of dual-ring pulse signals and power drive circuits to operate. Therefore, proper use of stepper motors is not easy, as it involves extensive professional knowledge in mechanics, motors, electronics, and computing. Currently, there are indeed many manufacturers producing stepper motors, but very few possess specialized technical personnel capable of independent development and research. Most manufacturers have only ten to twenty employees and lack even the most basic equipment, remaining merely in a stage of blind imitation. This causes considerable trouble for users in product selection and application. In view of the above, we have decided to take the widely used variable reluctance stepper motor as an example to describe its basic working principle, hoping to assist users in product selection, application, and overall machine improvement.

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