EMC motor Germany EMC model EMC price

EMC motors consist of the motor body and the driver, representing a typical mechatronic product. Brushless motors refer to motors without brushes and commutators (or slip rings), also known as commutator-less motors. As early as the nineteenth century, when motors were first invented, the practical motors produced were of the brushless type, namely AC squirrel-cage asynchronous motors, which were widely used. However, asynchronous motors have many insurmountable defects, resulting in slow development of motor technology. Transistors emerged in the mid-twentieth century, leading to the emergence of DC brushless motors that use transistor commutation circuits to replace brushes and commutators. This new type of brushless motor is called an electronically commutated DC motor, which overcomes the defects of the first generation of brushless motors.

EMC motor classification

Motors can be classified in the following two ways: AC motors are typically divided into AC generators, AC motors, and synchronous condensers based on their function. Due to the reversibility of motor operating states, the same motor can serve as either a generator or a motor. Dividing motors strictly into generators and motors is not entirely accurate; it is merely that some motors primarily operate as generators, while others primarily operate as motors. AC motors are divided into synchronous motors and asynchronous motors based on type. The rotor speed of a synchronous motor ns is the same as the speed of the rotating magnetic field, known as the synchronous speed. There is a strict relationship between ns, the frequency of the connected AC power (f), and the number of pole pairs of the motor (P). ns=60f/P. The power supply frequency is 50 Hz, so the synchronous speed of a one-pole-pair three-phase AC motor is 3000 rpm, and the synchronous speed of a two-pole-pair three-phase AC motor is 1500 rpm, and so on. The rotor speed of an asynchronous motor is always lower or higher than the speed of its rotating magnetic field, hence the name asynchronous. The difference between the rotor speed and the rotating magnetic field speed of an asynchronous motor (called slip) is usually within 10%.

EMC motor classification

The excitation method of a motor refers to how the excitation winding is supplied with power to generate excitation magnetomotive force and establish the main magnetic field. Based on different excitation methods, DC motors can be divided into the following types: 1. Separately excited DC motor: The excitation winding has no connection to the armature winding, and the DC motor where the excitation winding 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 DC motors. 2. Shunt-excited DC motor: The excitation winding of a shunt-excited DC motor is connected in parallel with the armature winding. For a shunt generator, the terminal voltage generated by the motor itself supplies the excitation winding; for a shunt motor, the excitation winding and the armature share the same power source, making it identical in performance to a separately excited DC motor. 3. Series-excited DC motor: The excitation winding of a series-excited DC motor 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. 4. Compound-excited DC motor: A compound-excited DC motor has two excitation windings: shunt and series. If the magnetomotive force generated by the series winding is in the same direction as that generated 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 excitation, while the main excitation methods for DC generators are separate, shunt, and compound excitation.

EMC motor maintenance methods

Motor maintenance and repair center motor maintenance process: Clean stator and rotor → Replace carbon brushes or other components → Vacuum F grade pressure impregnation with varnish → Dry → Calibrate dynamic balance. 1. The operating environment should be kept dry at all times, the motor surface should be kept clean, and the air inlet should not be obstructed by dust, fibers, etc. 2. When the thermal protection of the motor trips continuously, determine whether the fault originates from the motor, overload, or if the protection device setting value is too low. The motor can only be put into operation after eliminating the fault. 3. Ensure good lubrication of the motor during operation. Generally, after about 5000 hours of operation, lubricating grease should be replenished or replaced. If bearing overheating or grease deterioration is discovered during operation, replace the lubricating grease promptly. When replacing lubricating grease, remove the old lubricant, clean the bearing and the oil groove of the bearing cover with gasoline, and then fill the cavity between the inner and outer rings of the bearing with ZL-3 lithium-based grease to 1/2 (for 2 poles) and 2/3 (for 4, 6, 8 poles). 4. When the bearing reaches the end of its service life, the vibration and noise of the motor during operation will increase significantly. Check the radial clearance of the bearing; if it reaches the following values, the bearing should be replaced. 5. When disassembling the motor, the rotor can be removed from either the shaft extension end or the non-extension end. If it is not necessary to remove the fan, it is more convenient to remove the rotor from the non-shaft extension end. When extracting the rotor from the stator, prevent damage to the stator winding or insulation. 6. When replacing windings, record the original winding configuration, dimensions, number of turns, wire gauge, etc. If this data is lost, request it from the manufacturer. Arbitrarily changing the original design winding often deteriorates one or several performance metrics of the motor, or even renders it unusable.

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