Gearbox motor

Gearbox reducerproduct description

.According to the type of working power: it can be divided into DC motor and AC motor.

1) DC motors can be divided according to structure and working principle: brushless DC motors and brushed DC motors.

Brushed DC motors can be divided into: permanent magnet DC motors and electromagnetic DC motors.

Electromagnetic DC motors are divided into series excited DC motors, parallel excited DC motors, other excited DC motors and compound excited DC motors.

Permanent magnet DC motor division: rare earth permanent magnet DC motor, ferrite permanent magnet DC motor and aluminum nickel cobalt permanent magnet DC motor.

2) AC motors can also be divided into: single-phase motors and three-phase motors.

2. According to the structure and working principle, it can be divided into DC motor, asynchronous motor and synchronous motor.

1) Synchronous motors can be divided into: permanent magnet synchronous motors, reluctance synchronous motors and hysteresis synchronous motors.

2) Asynchronous motors can be divided into induction motors and AC commutator motors.

Induction motors can be divided into three-phase asynchronous motors, single-phase asynchronous motors and shaded pole asynchronous motors.

The AC commutator motor can be divided into: single-phase series excitation motor, AC-DC dual-use motor and repulsive motor.

3. It can be divided according to the starting and operating modes: capacitor starting single-phase asynchronous motor, capacitor running single-phase asynchronous motor, capacitor starting single-phase asynchronous motor and split-phase single-phase asynchronous motor.

4. It can be divided according to the purpose: driving motor and control motor.

1) Motors for driving can be divided into: motors for electric tools (including tools for drilling, polishing, polishing, grooving, cutting, reaming, etc.), household appliances (including washing machines, electric fans, refrigerators, air conditioners) , Motors for recorders, video recorders, DVD players, vacuum cleaners, cameras, hair dryers, electric shavers, etc.) and other general small mechanical equipment (including various small machine tools, small machines, medical equipment, electronic instruments, etc.).

2) The control motors are further divided: stepping motors and servo motors.

5. According to the structure of the rotor, it can be divided into: cage induction motor (the old standard is called squirrel cage asynchronous motor) and wound rotor induction motor (the old standard is called winding asynchronous motor).

6. It can be divided according to operating speed: high-speed motor, low-speed motor, constant-speed motor, speed-regulating motor Low-speed motors are divided into gear reduction motors, electromagnetic reduction motors, torque motors, and claw pole synchronous motors.

In addition to being classified into stepped constant speed motors, stepless constant speed motors, stepped variable speed motors and stepless variable speed motors, speed regulating motors can also be divided into electromagnetic speed regulating motors, DC speed regulating motors, PWM variable frequency speed regulating motors Switched reluctance motor.

The rotor speed of an asynchronous motor is always slightly lower than the synchronous speed of the rotating magnetic field.

The rotor speed of the synchronous motor has nothing to do with the load and is always maintained at the synchronous speed.

DC

The working principle of the DC generator is to convert the alternating electromotive force induced in the armature coil,

DC motor real picture

The principle that the commutator cooperates with the commutation function of the brush to make it become DC electromotive force when it is drawn from the brush end.

The direction of the induced electromotive force is determined according to the rule of the right hand (the magnetic induction line points to the palm of the hand, the thumb points to the direction of the conductor movement, and the other four fingers point to the direction of the induced electromotive force in the conductor).

working principle

The direction of the conductor force is determined by the left-hand rule. This pair of electromagnetic force forms a torque that acts on the armature. This torque is called electromagnetic torque in the rotating electrical machine. The direction of the torque is counterclockwise, attempting to rotate the armature counterclockwise. If this electromagnetic torque can overcome the resistance torque on the armature (such as resistance torque caused by friction and other load torque), the armature can rotate in a counterclockwise direction.

DC motors are motors that operate on DC operating voltage and are widely used in recorders, VCRs, DVD players, electric shavers, hair dryers, power tool accessories, safe accessories, electronic watches, toys, etc.

Electromagnetic

Electromagnetic DC motor is composed of stator poles, rotor (armature), commutator (commonly known as commutator), brushes, casing, bearings, etc.

The stator pole (main pole) of an electromagnetic DC motor is composed of an iron core and an excitation winding. According to the different ways of excitation (the old standard is called excitation), it can be divided into series excitation DC motor, parallel excitation DC motor, other excitation DC motor and compound excitation DC motor. Due to the different excitation methods, the laws of the stator pole magnetic flux (generated after the stator pole excitation coil is energized) are also different.

The field winding and the rotor winding of the series-excited DC motor are connected in series through the brush and the commutator. The excitation current is proportional to the armature current. The magnetic flux of the stator increases with the increase of the excitation current, and the torque is approximately The square of the armature current is proportional to the speed, and the speed drops rapidly with the increase of torque or current. The starting torque can be more than 5 times of the rated torque, and the short-term overload torque can be more than 4 times of the rated torque, the speed change rate is large, and the no-load speed is very high (general It is not allowed to run under no load). Speed ​​regulation can be achieved by using external resistors in series (or parallel) with the series winding, or by connecting the series winding in parallel.

The excitation winding of the parallel-excited DC motor is connected in parallel with the rotor winding, the excitation current is relatively constant, the starting torque is proportional to the armature current, and the starting current is about 2. {{1} of the rated current } About times. The speed decreases slightly with the increase of current and torque. The short-term overload torque is 1. {{1}} times the rated torque. The speed change rate is small, ranging from {{1}% ~ 1 {{1}}%. The speed can be adjusted by the constant power that weakens the magnetic field.

The excitation winding of the separately excited DC motor is connected to an independent excitation power supply, and its excitation current is relatively constant, and the starting torque is proportional to the armature current. The speed change is also 5% ~ 1 5%. The speed can be increased by weakening the magnetic field constant power or by reducing the voltage of the rotor winding.

In addition to the parallel excitation winding, the stator pole of the compound excitation DC motor is also equipped with a series excitation winding connected in series with the rotor winding (the number of turns is small). The direction of the magnetic flux generated by the series winding is the same as the direction of the magnetic flux of the main winding, the starting torque is about 4 times the rated torque, and the short-term overload torque is 3. { {2}} times. The speed change rate is 2 5% ~ 3 0% (related to the series winding). The speed can be adjusted by weakening the magnetic field strength.

0010010 nbsp;

0010010 nbsp;