EMS motor Germany EMS model EMS price

EMS motor refers to a motor that, under standard environmental conditions, operates continuously at 100% rated load within the 10%~100% rated speed range, with temperature rise not exceeding the motor's specified allowable value. When the slip of an asynchronous motor does not change significantly, the speed is proportional to the frequency; thus, changing the power supply frequency changes the speed of the asynchronous motor. During variable frequency speed control, it is always desired to keep the main magnetic flux constant. If the main magnetic flux is greater than the flux during normal operation, the magnetic circuit becomes saturated, causing an increase in excitation current and a decrease in power factor; if the main magnetic flux is less than the flux during normal operation, the motor torque decreases.

EMS motor principle

A stepper motor is an open-loop control component that converts electrical pulse signals into angular or linear displacement. Under non-overload conditions, the motor's speed and stopping position depend solely on the frequency and number of pulses, unaffected by load variations; that is, each pulse causes the motor to rotate by one step angle. The existence of this linear relationship, combined with the characteristic that stepper motors have only periodic errors without cumulative errors, makes control in applications such as speed and position very simple. Although stepper motors are widely used, they cannot be used under conventional conditions like ordinary DC or AC motors. They require a control system composed of dual-ring pulse signals, power drive circuits, and other components to operate. Therefore, proper use of stepper motors is not easy, as it involves extensive professional knowledge in mechanics, motors, electronics, and computing. Nowadays, while there are indeed many manufacturers producing stepper motors, very few have specialized technical personnel capable of independent development and research. Most manufacturers have only ten to twenty employees and lack even the most basic equipment, remaining in a stage of blind imitation. This causes considerable trouble for users in product selection and usage. In view of the above situation, we have decided to take the widely used variable-reluctance stepper motor as an example to describe its basic working principle, hoping to assist users in selection, usage, and overall machine improvement.

EMS motor speed control

The motor is essentially a servo motor, composed of a synchronous motor and a driver, making it a variable frequency speed control motor. The brushless DC motor with voltage-regulated speed control is a true brushless DC motor, consisting of a stator and a rotor. The stator comprises an iron core with coils wound in a 'forward-reverse-forward-reverse...' pattern, thereby generating a fixed magnetic field of the N-S group. The rotor consists of a cylindrical magnet (with a shaft in the center) or an electromagnet with collector rings. This brushless DC motor can generate torque but cannot control direction. Regardless, this motor is a very significant invention. When used as a DC generator, this invention can produce DC current with continuous amplitude, thereby avoiding the use of filter capacitors. The rotor can be permanent magnet, brushed excitation, or brushless excitation. When used as a large-scale motor, this motor generates self-inductance and requires protective devices.

EMS motor advantages

The magnetic field of the motor is generated by permanent magnets, thereby avoiding excitation losses (i.e., copper losses) caused by generating the magnetic field through excitation current. With no current in the rotor during operation, the motor temperature rise is significantly reduced, being more than 20K lower under the same load conditions. Permanent magnet synchronous motors have a high power factor, which is independent of the number of motor poles. At full load, the power factor approaches 1, resulting in lower motor current compared to asynchronous motors. Consequently, stator copper losses are reduced, and efficiency is higher. In contrast, the power factor of asynchronous motors decreases as the number of poles increases. Furthermore, due to the high power factor of permanent magnet synchronous motors, the capacity of the associated power supply (transformer) can theoretically be reduced, allowing for a reduction in the specifications of associated switchgear and cables. Permanent magnet synchronous motors also offer advantages such as high starting torque, short starting time, and high overload capacity. The installed capacity of the drive motor can be reduced based on the actual shaft power, saving energy and reducing fixed asset investment. Control of permanent magnet synchronous motors is convenient, with constant speed that does not vary with load or voltage fluctuations but depends solely on frequency, ensuring smooth and reliable operation. Due to strict speed synchronization and good dynamic response, they are suitable for variable frequency control. The installation dimensions of permanent magnet synchronous motors comply with IEC standards, allowing direct replacement of three-phase asynchronous motors. The protection rating can achieve IP54 and IP55, and some manufacturers also produce explosion-proof permanent magnet synchronous motors.

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