YTRVF(W)Variable一Frequency Three-Phase Asynchronous Stewing Motor for Tower Crane

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Overview
This series motor is a variable-frequency three-phase asynchronous motor exclusively designed for tower cranes and other similar dewing mechanisms. It is applied to the dewing
mechanisms in very harsh working conditions such as construction site or open pit quarry.

Features

With introduction of spline drive shaft, it has good mechanical bearing capacity;
The motor is a variable-frequency motor featuring a wide range of speed regulation, high efficiency, small starting current, big starting torque and overload ability;
A thermal protection component is buried into the in winding, making motor more safer and reliable;
Excellent dedicated variable-frequency insulation materials are adopted, improving greatly the insulation reliability;
Compact structure, small volume, lightweight, so it can be braked quickly and positioned accurately. It is suitable for frequent starting and braking;
YTRVFW series motor is provided with an eddy current brake on the basis of YTRVF series. It enables more smooth starting and deceleration braking, making the operation
more smooth and accurate

Users’Options:
This series motor is divided into F1 and F2
F1 with airvane brake;will be determined by the
F2 without airvane brake;users when signing the contract but an encoder interface can be reserved

Q: Can AC motors use direct current?: DC motor is also on the brush structure changing direction of manufacturing power changing magnetic field, electromagnetic force and drag on the rotor, the AC motor for AC power supply design, no directional structure, once the direct current, stator winding equivalent inductance and resistance, inductance in the DC power supply and the equivalent circuit, the resistance heating to a certain extent possible burn.

Q: The coil of an AC motor has a resistance of 5 ohms. The motor is plugged into an outlet where V=120V (rms) and the coil develops a back emf of 118V (rms) when rotating at normal speed. The motor is turning a wheela)Find the current (rms) when the motor first starts upb)Find the current when the motor is operating at normal speed: At the moment the motor starts it has no back emf developed, so the current is (from Ohm's law): I = V / R = 120 volts / 5 ohms = 24 amps When the motor is operating normally it produces a back emf of 118 volts, so the total voltage across the motor is 120 volts - 118 volts = 2 volts. Using Ohm's Law again, but with the new voltage, we get: I = V / R = 2 volts / 5 ohms = 0.4 amps

Q: In A.C motor we have all three phase currents equally or separately supplied for each phase. In D.C motor only one current. The load can appear in the equation in any form.: You can start with the equation that input electrical power is mechanical power delivered to the load by the motor shaft plus losses. For DC, Power (Watts) = Voltage (Volts) X Current (Amperes). For three phase AC, Power (Watts) = RMS Line Voltage (Volts) X RMS Line Current (Amperes) X Square Root of 3 (1.732) X Power Factor (Cos of phase difference between voltage and current). For mechanical power, Power (Watts) = Torque (Newton – Meters) X Rotational Speed (radians per second). Therefore: For a DC motor, Input Current = (Torque X Speed + Losses) / Input Voltage. For a 3-Phase AC motor, Input Current = (Torque X Speed + Losses) / (Input Voltage X 1.732 X pf) The losses include both electrical losses and mechanical losses that are proportional to voltage, current, frequency (for AC), and speed. Speed depends on the speed vs. torque characteristics of the driven load and the speed vs. torque characteristics of the motor. At steady state, the motor operates at the intersection of the motor speed vs. torque curve and the load speed vs. torque curve. The DC motor speed vs. torque curve depends on the machine design and the applied voltage. The AC motor speed vs. torque curve depends on the machine design and the applied frequency and voltage. It is also important to note that the power factor of an AC motor is not constant. It varies with load.

Q: Why does the AC motor turn?Do I feel that the coil is not in a steady state?: Because the child is short circuit loop ends conductor short circuit, in the role of the induced EMF, will produce the rotor conductor with Induction EMF direction basic consistent induced current. The rotor load by electromagnetic force in the stator magnetic conductor (the role of the direction of the force with the left hand dingze judge). The electromagnetic force electromagnetic torque the rotor shaft to drive the rotor to rotate along the rotating direction of the magnetic field.

Q: now i am using one dc 130 bhp motor for my crane. i want to change the motor to ac type, so what should be ac motor hp that equal to 130 hp dc motor.: A horsepower is a horsepower. It is defined as 550 foot-pounds per second, exactly equal to 746 watts. A bhp is a horsepower. Nobody has any idea where the 'b' came from or what it means. Back in 1962 I witnessed an argument that went on for over an hour in a college dorm, one side saying it stood for brake horsepower and the other insisting it meant blown horsepower, and neither side knowing exactly what those terms meant either.

Q: AC speed regulation motor + turbo reducer instead of cam cutter + AC motor?: The main error in cam dividers is that:1, because of the impact of inertia, resulting in errors caused by elastic deformation2., because of inertia lead to overshoot error3, cam gap caused by machining gap error

Q: What would happen if you tried to run a DC (direct current) motor on AC (alternating current) power?: I think the motor will turn back and forth if the frequency of the AC power is low enough, and it will just vibrate if the frequency is too high.

Q: I was planning on building an electric car hopefully weighing around 500KG and i was looking at a three phase motor rated 52.3A at 400V and was wondering how to convert/invert the power from a single phase DC power from batteries, to a three phase AC power to run the motor, i have looked a inverters but they all say, that if you put a single phase power source into it you can only power a max of a 3Kw motor, so i was thinking if i could maybe use 2 inverters, not sure if thats possible or not, or if someone has had experience in this and know a way of doing this as i cant get mains power to a moving car, anyway if anyone knows how to do this please let me know, i would be so grateful as i have spent at least 24+ hours trying to research this.: you have selected an electric motor used for a diesel electric locomotive. they don't convert battery power to make 3 phase 400 volts. instead they use a diesel engine to run an electric generator. 52.3 amps at 400 volts would require 1740 amps from a 12 volt source. your car would need 10 giant 200 amp-hour batteries, that would be about 1000 kg of weight by itself. the only practical way to get 3 phase power from a DC source is with a motor-generator. think about it, using a motor to rotate a generator to run a motor is highly inefficient power conversion. you need to stick with a DC motor, one of reasonable size, that can be powered by a battery bank that weighs in at under half the total weight of the vehicle. 5 KW single phase is about the maximum power that can be generated by practical inverters. but you would not be able to run a 5 KW motor from that, because inverters have no surge capacity to deliver the start up motor current. that is another reason you need to stick with a DC only power system.

Q: AC operation of AC motor control circuit must be used?: Yes, commutator is requiredThe commutator is a component of a DC permanent magnet series motor that allows the motor to continue to rotate.Structurally, the commutator is a plurality of contact pieces which are round in shape and are connected with each tap of the rotor respectively, and two electrodes are connected outside to be called an electric brush to contact with them, and only two of them are contacted at the same time.

Q: Hi i am looking for a company that makes hollow shaft ac motors , it is american company that is called US , but i cannot seem to find it anywhere , i tried googling for it but obviously the brand name ( US ) isvery common that i get a lot of results that i am not looking for , can any one help me with this brand , if there is a website or something for them i woud really appreciate it: Go to yahoo. Type in hallow shaft ac motor... And you will find it

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