CAT CAMS motor, German CAT CAMS model, CAT CAMS price

CAT CAMS motor refers to a low-power single-phase asynchronous motor powered by a single-phase AC supply (AC220V). This type of motor typically has two-phase windings on the stator, and the rotor is of the standard squirrel-cage type. Different distributions of the two-phase windings on the stator and different power supply conditions can produce different starting and operating characteristics.

CAT CAMS motor applications

The motor has advantages such as simple structure, ease of manufacturing, low cost, and reliable operation, but its power factor is relatively low (less than 0.5), and efficiency is also low. The power of reluctance synchronous motors generally ranges from a fraction of a watt to hundreds of watts, and they are commonly used in automatic control devices, physical instruments, movie projectors, electrostatic copiers, and other equipment. Reluctance synchronous motors have a simple structure, low cost, and reliable operation, and are widely used in automatic and remote control devices, recording and fax machines, and the clock industry. An AC motor whose operating speed maintains a constant ratio to the frequency of the connected power supply. During operation, the motor speed is always equal to the synchronous speed, hence the term synchronous motor. Synchronous motors are widely used in high-power production machinery that does not require speed adjustment, such as large air compressors, crushers, blowers, and motor-generator sets, with powers reaching several kilowatts or even tens of thousands of kilowatts. Compared with asynchronous motors of the same capacity, high-power synchronous motors have obvious advantages: high power factor, and it is possible to adjust the excitation current to operate at a leading power factor, which helps improve the power factor of the grid; high-power, low-speed synchronous motors have a smaller volume. Synchronous motors can be divided into salient-pole and non-salient-pole types according to rotor structural characteristics, and are generally made as salient-pole types. If classified by the fixed position of the magnetic poles, there are rotating-armature types with magnetic poles fixed on the stator (the rotor contains a three-phase AC winding, connected to the external circuit via slip rings and brushes on the shaft) and rotating-field types with magnetic poles fixed on the rotor, with the latter being more common. The magnetic poles of synchronous motors are generally excited by DC current; those using permanent magnets are called permanent magnet synchronous motors. A synchronous motor operating in motor state without mechanical load, only providing or absorbing reactive power to the grid, is called a synchronous condenser or synchronous compensator, used to improve grid power factor and maintain grid voltage levels.

CAT CAMS motor working principle

The motor uses capacitor phase shifting to separate another phase of AC power with a phase difference of 90 degrees from the single-phase AC supply. These two phases of AC power are fed into two or four groups of motor coil windings, forming a rotating magnetic field within the motor. This rotating magnetic field induces current in the motor rotor. The magnetic field generated by the induced current opposes the direction of the rotating magnetic field, causing the rotor to be pushed and pulled into rotation. Since the rotor must cut magnetic flux lines to generate induced current, the rotor speed must be lower than the speed of the rotating magnetic field, hence the term asynchronous motor. Three-phase asynchronous motors do not require capacitor phase shifting, as they inherently have three-phase AC power with a phase difference of 120 degrees, resulting in a more uniform rotating magnetic field and higher efficiency. The magnetic field of a permanent magnet synchronous AC motor is generated by permanent magnets. The rotor coils are powered via brushes, and the speed is an integer multiple (or fraction) of the AC frequency (depending on the number of rotor coil windings), hence the term synchronous motor. Motors where rotor coils are powered via brushes and the stator generates a rotating magnetic field through coil windings are classified as series-wound or shunt-wound motors based on the series or parallel relationship between the rotor and stator coils. A DC motor consists of two main parts: the stator and the rotor. The stator has magnetic poles (wound or permanent magnet), and the rotor has windings. When energized, a magnetic field (magnetic poles) is formed on the rotor. There is an angle between the magnetic poles of the stator and the rotor. Under the mutual attraction between the stator and rotor magnetic fields (between N pole and S pole), the motor rotates. Changing the position of the brushes changes the direction of the angle between the stator and rotor magnetic poles (assuming the stator magnetic pole is the starting side of the angle, and the rotor magnetic pole is the other side; the direction from the rotor magnetic pole pointing to the stator magnetic pole is the direction of motor rotation), thereby changing the direction of motor rotation.

CAT CAMS motor motor principle

The motor has two windings: the starting winding and the running winding. The two windings are spatially separated by 90 degrees. A large-capacity capacitor is connected in series with the starting winding. When the running winding and starting winding are supplied with single-phase AC, the capacitor causes the current in the starting winding to lead the current in the running winding by 90 degrees in time, reaching its maximum value first. This forms two identical pulsating magnetic fields in time and space, generating a rotating magnetic field in the air gap between the stator and rotor. Under the action of the rotating magnetic field, induced current is generated in the motor rotor. The interaction between the current and the rotating magnetic field produces electromagnetic torque, causing the motor to rotate.

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