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CARBOLITE motors adjust speed by changing the number of magnetic pole pairs, voltage, current, frequency, and other parameters to achieve higher performance. Due to their excellent performance, adjustable-speed motors are widely used in industries such as steel, power generation, cable manufacturing, chemicals, petroleum, cement, textiles, printing and dyeing, papermaking, and machinery for stepless speed control of loads with constant or decreasing torque. They are particularly suitable for driving pumps and fans with significant flow variations, offering good energy-saving results

CARBOLITE motor performance

Comparison of motor performance: comparison between servo motors and stepper motors. As an open-loop control system, the stepper motor is fundamentally linked to modern digital control technology. In domestic digital control systems, stepper motors are widely used. With the emergence of all-digital AC servo systems, AC servo motors are also increasingly applied in digital control systems. To adapt to the development trend of digital control, motion control systems mostly use stepper motors or all-digital AC servo motors as actuator motors. Although the two are similar in control method (pulse train and direction signals), there are significant differences in performance and application scenarios. The following compares their performance. One, different control accuracy: the step angle of a two-phase hybrid stepper motor is generally 1.8° or 0.9°; the step angle of a five-phase hybrid stepper motor is generally 0.72 ° or 0.36°. Some high-performance stepper motors achieve smaller step angles through microstepping. Two, different low-frequency characteristics: stepper motors are prone to low-frequency vibration at low speeds. The vibration frequency depends on the load condition and driver performance; it is generally considered to be half the no-load slew rate frequency of the motor. This low-frequency vibration phenomenon, determined by the working principle of the stepper motor, is very unfavorable for the normal operation of machinery. When a stepper motor operates at low speed, damping techniques should generally be used to overcome low-frequency vibration, such as adding a damper to the motor or using microstepping technology in the driver. AC servo motors run very smoothly and do not exhibit vibration even at low speeds. The AC servo system has a resonance suppression function that can compensate for insufficient mechanical rigidity, and the system internally includes a frequency analysis function (FFT) to detect mechanical resonance points, facilitating system adjustment.

CARBOLITE motor speed control

Most motor speed control methods involve adjusting voltage, thereby changing the electromotive force (EMF). Based on mechanical characteristics, motor speed is influenced by EMF, magnetic flux, and the number of armature conductors. For manufactured motors, the number of conductors is fixed and cannot be changed, ruling out this method. Adjusting magnetic flux requires connecting an adjustable resistor in parallel with the excitation coil; however, this consumes significant power and requires large components, making it neither simple nor economical. Voltage regulation using thyristor speed control technology is a simple and effective method, characterized by simple circuits and small component sizes. For single-phase series-wound motors, voltage speed control uses controllable phase-shifting voltage regulation, where the thyristor trigger voltage lags behind the input voltage to achieve phase-shifted triggering. Implementation can be hardware-based or software-based. Hardware designs for reliable speed control often use specialized integrated circuits as control lines and install speed sensors on the motor shaft to feedback speed signals, maintaining stable speed regardless of load. However, these high-performance devices lack competitiveness in household appliance speed control due to complex circuits, high costs, and large sizes. Software methods require only adding a microprocessor, into which control algorithms are written. The microprocessor triggers the delayed conduction of thyristors to control the speed of series-wound motors. This approach features simpler circuits, can be implemented with microcontrollers, and saves costs, making it widely adopted in practical applications. Based on controllable phase-shifting rectification, there are full-wave and half-wave rectification methods. Similarly, speed control for series-wound motors can be full-wave or half-wave. In half-wave rectification, during the positive half-cycle of the AC sine wave, a suitable positive pulse signal is given after a delay time based on thyristor characteristics, causing the thyristor to conduct and powering the series-wound motor. Different delay times correspond to different voltage excitations, resulting in different output speeds for speed control. The principle of full-wave control is similar but uses bidirectional thyristors. During the negative half-cycle of the AC sine wave, control pulses are issued to the thyristors to regulate the input power voltage. This allows speed signal adjustment twice per power cycle, improving system response speed, ensuring smoother motor operation, and providing a wider speed control range.

CARBOLITE motor troubleshooting

Motor measurement terminals: (1) first identify the two ends (start and finish) of each of the three-phase windings. Set the multimeter to the resistance range for measurement. Coils of the same phase are connected and show negligible resistance, while coils of different phases are not connected. Therefore, the multimeter can be used to determine which two wire ends belong to the same phase winding. (2) identify the polarity (same-name terminals) of the lead wires from two of the windings. Set the pointer multimeter to the smallest DC current range. Connect the two wire ends of any one phase winding to the meter leads. Then briefly touch the two wire ends of another phase winding to the positive and negative terminals of a dry battery. At the instant the battery is connected to the coil, if the meter needle deflects toward the greater-than-zero side (i.e., clockwise), then the battery positive terminal and the black test lead of the multimeter are connected to the same-name terminals; otherwise, they are opposite. Daily maintenance content for continuously operating three-phase asynchronous motors: visual inspection; check whether the fan is working properly; check for abnormal vibration; check whether the coupling connection is reliable; check whether the base mounting is secure; check whether the bearings are working properly (by listening for sound); check whether the temperature is normal (using an infrared thermometer); regularly inspect wire connections and switch contacts; check whether the operating current is normal (using a clamp-on ammeter); additionally, for wound-rotor motors, inspect the carbon brushes and slip rings.

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