BIMBA motor, Germany BIMBA model, BIMBA price

BIMBA motors are a type of electric motor powered by simultaneously connecting to 380V three-phase AC current (with a phase difference of 120 degrees). Because the rotor of a three-phase asynchronous motor rotates in the same direction but at a different speed than the stator's rotating magnetic field, there is slip, hence the name three-phase asynchronous motor. The rotor speed of a three-phase asynchronous motor is lower than the speed of the rotating magnetic field. The rotor windings generate electromotive force and current due to relative motion with the magnetic field, and interact with the magnetic field to produce electromagnetic torque, achieving energy conversion.

BIMBA motor excitation method

Motor excitation method refers to the method of generating a magnetic field in rotating electrical machines. DC motor excitation methods are divided into four types: separately excited DC motor, shunt-excited DC motor, series-excited DC motor, and compound-excited DC motor. A DC motor where the field winding has no connection to the armature winding and is supplied by another DC power source is called a separately excited DC motor. Permanent magnet DC motors can also be regarded as separately excited or self-excited DC motors, generally referred to directly as permanent magnet excitation. In a shunt-excited DC motor, the field winding is connected in parallel with the armature winding. As a shunt generator, the terminal voltage generated by the motor itself supplies the field winding; as a shunt motor, the field winding and armature share the same power source, and its performance is identical to that of a separately excited DC motor. In a series-excited DC motor, the field winding is connected in series with the armature winding, and then connected to the DC power source. The excitation current of this DC motor is the armature current. A compound-excited DC motor has two field windings: shunt and series. If the magnetomotive force produced by the series winding is in the same direction as that produced by the shunt winding, it is called cumulative compound excitation. If the directions of the two magnetomotive forces are opposite, it is called differential compound excitation. DC motors with different excitation methods have different characteristics. Generally, the main excitation methods for DC motors are shunt, series, and compound; the main excitation methods for DC generators are separate, shunt, and compound.

BIMBA motor structure

A single-phase motor is an electric motor that requires only a single-phase AC power supply. A single-phase asynchronous motor consists of a stator, rotor, bearings, housing, end covers, etc. The stator consists of a frame and a core with windings. The core is made of stacked silicon steel sheets with slots, inside which two sets of main windings (also called running windings) and auxiliary windings (also called starting windings or secondary windings) are installed, spatially separated by 90° electrical degrees. The main winding is connected to the AC power supply, and the auxiliary winding is connected in series with a centrifugal switch S or starting capacitor, running capacitor, etc., before being connected to the power supply. The rotor is a squirrel-cage cast aluminum rotor, formed by casting aluminum into the slots of the stacked core and casting end rings together, short-circuiting the rotor bars to form a squirrel cage. Single-phase asynchronous motors are further classified into single-phase resistance-start asynchronous motors, single-phase capacitor-start asynchronous motors, single-phase capacitor-run asynchronous motors, and single-phase dual-value capacitor asynchronous motors.

BIMBA motor fault troubleshooting

Motor winding ground fault. 1. Symptoms: live motor frame, loss of control circuit control, winding short-circuit heating, causing the motor to fail to operate normally. 2. Causes: winding dampness reduces insulation resistance; long-term overload operation of the motor; corrosion by harmful gases; metal foreign objects entering the winding interior and damaging insulation; insulation damage and contact with the core during stator winding rewinding; winding ends contacting the end cover or frame; insulation burnout caused by stator-rotor friction; lead wire insulation damage contacting the housing; overvoltage (such as lightning strike) causing insulation breakdown. 3. Inspection methods: (1) Visual inspection. Visually inspect the winding ends and insulation materials in the slots for damage and scorch marks; if present, these indicate the ground point. (2) Multimeter inspection. Use the low-resistance range of a multimeter; if the reading is very low, it indicates a ground fault. (3) Megohmmeter method. Select different megohmmeters according to the voltage class to measure the insulation resistance of each winding group. If the reading is zero, it indicates that the winding is grounded. However, for motor insulation dampness or breakdown due to accidents, judgment must be based on experience. Generally, if the pointer fluctuates unstably at "0", it can be considered to have a certain resistance value. (4) Test lamp method. If the test lamp lights up, it indicates a winding ground fault. If sparks or smoke are observed at a specific location, that location is the ground fault point. If the lamp glows dimly, it indicates insulation breakdown with grounding. If the lamp does not light up but sparks appear when the test probe is grounded, it indicates that the winding has not broken down but is severely damp. You can also lightly tap the edge of the housing spigot with a hard wood block; if the lamp flickers (on and off) at a certain spot, indicating intermittent current flow, that spot is the ground point. (5) Current burn-out method. Use a variable transformer. After connecting to the power supply, the ground point will heat up quickly; the spot where the insulation smokes is the ground point. Pay special attention: for small motors, the current must not exceed twice the rated current, and the duration must not exceed half a minute; for large motors, use 20%-50% of the rated current, or gradually increase the current until the ground point just starts to smoke, then immediately cut off the power. (6) Group elimination method. For ground points inside the core with severe burning, where damaged copper wires are fused with the core, the method is to divide the grounded phase winding into two halves, and so on, to finally locate the ground point. 4. Remedial methods: (1) For ground faults caused by winding dampness, dry the winding first. When it cools to around 60–70℃, apply insulating varnish and dry again. (2) If the winding end insulation is damaged, re-insulate the ground point, apply varnish, and dry again. (3) If the winding ground point is in the slot, rewind the winding or replace part of the winding components. Finally, measure with different megohmmeters to ensure technical requirements are met.

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