Brushless Motors
... printouts of the A-to-B and A-to-C line-to-line voltages. In both cases, note the relative time displacements and magnitudes of the waveforms. c) Next we will verify that the no-load motor speed is proportional to applied voltage. Vary the voltage to the motor in 5 volt steps from 0 to 30 volts by u ...
... printouts of the A-to-B and A-to-C line-to-line voltages. In both cases, note the relative time displacements and magnitudes of the waveforms. c) Next we will verify that the no-load motor speed is proportional to applied voltage. Vary the voltage to the motor in 5 volt steps from 0 to 30 volts by u ...
- Switched Reluctance Drive Systems
... The absence of rotor copper loss eliminates the problem that the induction motor has associated with rotor cooling due to its poor thermal effects. The absence of permanent magnets on the rotor eliminates the problem that the Brushless DC motor has with high temperature environments whereby the magn ...
... The absence of rotor copper loss eliminates the problem that the induction motor has associated with rotor cooling due to its poor thermal effects. The absence of permanent magnets on the rotor eliminates the problem that the Brushless DC motor has with high temperature environments whereby the magn ...
AN2132
... ring mode without load. The VBAT value must be chosen taking into account the absolute maximum ratings of the device (VBTOT = 90 V). VBTOT = (VBAT + VPOS) = 90 V must not be exceeded. When ring mode is selected through the control interface, the VBAT voltage is increased by an internal circuit from ...
... ring mode without load. The VBAT value must be chosen taking into account the absolute maximum ratings of the device (VBTOT = 90 V). VBTOT = (VBAT + VPOS) = 90 V must not be exceeded. When ring mode is selected through the control interface, the VBAT voltage is increased by an internal circuit from ...
Brushless DC Motor Control Made Easy
... the current to the motor will be a series of high current pulses instead of the desired average of the voltage waveform. Averaging is easier to attain at lower frequencies if the parasitic motor inductance is relatively high, but high inductance is an undesirable motor characteristic. The ideal freq ...
... the current to the motor will be a series of high current pulses instead of the desired average of the voltage waveform. Averaging is easier to attain at lower frequencies if the parasitic motor inductance is relatively high, but high inductance is an undesirable motor characteristic. The ideal freq ...
ZXTP19100CFF 100V, SOT23F, PNP medium power transistor Summary Description
... Semiconductor devices are susceptible to damage by ESD. Suitable precautions should be taken when handling and transporting devices. The possible damage to devices depends on the circumstances of the handling and transporting, and the nature of the device. The extent of damage can vary from immediat ...
... Semiconductor devices are susceptible to damage by ESD. Suitable precautions should be taken when handling and transporting devices. The possible damage to devices depends on the circumstances of the handling and transporting, and the nature of the device. The extent of damage can vary from immediat ...
massachusettsinstitut eoftechnology department of electrical
... Switch to waveform window. In the waveform window this button switches to the editor window. Of course, you can accomplish the same thing by clicking on the border of the window you want in front, but sometimes using this button is less work. Using information supplied in the checkoff file, check fo ...
... Switch to waveform window. In the waveform window this button switches to the editor window. Of course, you can accomplish the same thing by clicking on the border of the window you want in front, but sometimes using this button is less work. Using information supplied in the checkoff file, check fo ...
MULTIMETRI DIGITALI SERIE DMG
... For medium power systems, the voltage level is normally between 800 and 1000VDC in IEC countries, while voltage limits in North America are up to 600VDC only in compliance with NEC standards. As mentioned above, it is clear installation drawbacks can arise upstream and downstream of the inverter, us ...
... For medium power systems, the voltage level is normally between 800 and 1000VDC in IEC countries, while voltage limits in North America are up to 600VDC only in compliance with NEC standards. As mentioned above, it is clear installation drawbacks can arise upstream and downstream of the inverter, us ...
EE 4343 Lab#1 – Part 1
... measure it there and assume that the motor back EMF constant is the same. Refer to Figures 2 and 3 when making connections to the DC motor module. a) Connect the data acquisition systems analog ground to the motor control module ground. This connection should be made any time the data acquisition sy ...
... measure it there and assume that the motor back EMF constant is the same. Refer to Figures 2 and 3 when making connections to the DC motor module. a) Connect the data acquisition systems analog ground to the motor control module ground. This connection should be made any time the data acquisition sy ...
MAX13253 1A, Spread-Spectrum, Push-Pull, Transformer Driver for Isolated Power Supplies General Description
... optionally be driven by an external clock to further manage EMI. Internal circuitry guarantees a fixed 50% duty cycle to prevent DC current flow through the transformer, regardless of which clock source is used. The MAX13253 operates with up to 1A of continuous current and features integrated protec ...
... optionally be driven by an external clock to further manage EMI. Internal circuitry guarantees a fixed 50% duty cycle to prevent DC current flow through the transformer, regardless of which clock source is used. The MAX13253 operates with up to 1A of continuous current and features integrated protec ...
here - Transaction on electrical engineering
... Heating in large properties can be ensured by means of heat pumps. Heat pumps supply up to three times the volume of heat compared to the amount of power they consume from the mains. Heating with heat pumps system is set for fully automatic operation with control options depending on utilisation of ...
... Heating in large properties can be ensured by means of heat pumps. Heat pumps supply up to three times the volume of heat compared to the amount of power they consume from the mains. Heating with heat pumps system is set for fully automatic operation with control options depending on utilisation of ...
Quadruple Half-H Drivers (Rev. C)
... Output voltage range, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −3 V to VCC2 + 3 V Peak output current, IO (nonrepetitive, t ≤ 5 ms): L293 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±2 A Pea ...
... Output voltage range, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −3 V to VCC2 + 3 V Peak output current, IO (nonrepetitive, t ≤ 5 ms): L293 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±2 A Pea ...
A New Figure of Merit and General Properties of Wireless
... load resistances Rr . IV. T RANSMISSION Q UALITY FACTOR As discussed above the figure of merit as defined in [4] has some difficulties which in fact limit its applicability to inductive power transmission systems with negligible Rtr [7]. To overcome these limitations we propose another figure of mer ...
... load resistances Rr . IV. T RANSMISSION Q UALITY FACTOR As discussed above the figure of merit as defined in [4] has some difficulties which in fact limit its applicability to inductive power transmission systems with negligible Rtr [7]. To overcome these limitations we propose another figure of mer ...
Towards a Portuguese participation in the
... At least 2 solid companies (preferably 3) shall be able to provide the same or equivalent “Of the shelf” product (double source), to avoid risks of bankruptcy, monopoles in the long term future; The project team shall have a “word to say” on the selection of the topology (technology); Do not delegat ...
... At least 2 solid companies (preferably 3) shall be able to provide the same or equivalent “Of the shelf” product (double source), to avoid risks of bankruptcy, monopoles in the long term future; The project team shall have a “word to say” on the selection of the topology (technology); Do not delegat ...
Spindle Drive System Troubleshooting
... be individually tested for a short. Contact us for further instructions about testing motor coil to coil shorts. ...
... be individually tested for a short. Contact us for further instructions about testing motor coil to coil shorts. ...
LUDLUM MODEL 5 GEIGER COUNTER Revised July 1999 Serial
... R52 limits the current to V1. R10 and R20 provide bias. R32 protects Q5 from input shorts. R5 couples the detector to the high voltage supply. Detector (V2) pulses are coupled from the detector through C27 to emitter follower 47. R45 limits the current to V2. R21 and R41 provide bias to 4 7 . R40 pr ...
... R52 limits the current to V1. R10 and R20 provide bias. R32 protects Q5 from input shorts. R5 couples the detector to the high voltage supply. Detector (V2) pulses are coupled from the detector through C27 to emitter follower 47. R45 limits the current to V2. R21 and R41 provide bias to 4 7 . R40 pr ...
PDF：2.06MB
... The M81748FP evaluation board provides a platform for efficient testing of S1-Series NX Package 6in1 IGBT Modules of MITSUBISHI ELECTRIC driven by the dedicated HVIC M81748FP. By simple connection of a 3~AC mains voltage, a DC-link capacitor bank, a 15V single supply and control signals, a complete ...
... The M81748FP evaluation board provides a platform for efficient testing of S1-Series NX Package 6in1 IGBT Modules of MITSUBISHI ELECTRIC driven by the dedicated HVIC M81748FP. By simple connection of a 3~AC mains voltage, a DC-link capacitor bank, a 15V single supply and control signals, a complete ...
OP77 (Rev. G)
... the need for VOS adjustment and increases system accuracy over temperature. A PSRR of 3 μV/V (110 dB) and CMRR of 1.0 μV/V maximum virtually eliminate errors caused by power supply drifts and common-mode signals. This combination of outstanding characteristics makes the OP77 ideally suited for high ...
... the need for VOS adjustment and increases system accuracy over temperature. A PSRR of 3 μV/V (110 dB) and CMRR of 1.0 μV/V maximum virtually eliminate errors caused by power supply drifts and common-mode signals. This combination of outstanding characteristics makes the OP77 ideally suited for high ...
Modeling of Load During and After System Faults Based on Actual
... Figure 1 shows an illustration of load in a power system. As described above, typically the active power measured at substation is approximately same as the summation of the power consumed by load on the various feeders emanating out of the respective substation. On the other hand, the reactive powe ...
... Figure 1 shows an illustration of load in a power system. As described above, typically the active power measured at substation is approximately same as the summation of the power consumed by load on the various feeders emanating out of the respective substation. On the other hand, the reactive powe ...
HIGH PRECISION SOURCE MEASURE UNIT MODEL 52400 SERIES
... A solar cell has a diode structure type which can be characterized by I-V sweep. The nature of energy generation requires the unique load sweep for light forward I-V curve that is used to derive most of the important parameters of a solar cell. A voltage source will then be required for reverse perf ...
... A solar cell has a diode structure type which can be characterized by I-V sweep. The nature of energy generation requires the unique load sweep for light forward I-V curve that is used to derive most of the important parameters of a solar cell. A voltage source will then be required for reverse perf ...
Pulse-width modulation
Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors. In addition, PWM is one of the two principal algorithms used in photovoltaic solar battery chargers, the other being MPPT.The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load.The PWM switching frequency has to be much higher than what would affect the load (the device that uses the power), which is to say that the resultant waveform perceived by the load must be as smooth as possible. Typically switching has to be done several times a minute in an electric stove, 120 Hz in a lamp dimmer, from few kilohertz (kHz) to tens of kHz for a motor drive and well into the tens or hundreds of kHz in audio amplifiers and computer power supplies.The term duty cycle describes the proportion of 'on' time to the regular interval or 'period' of time; a low duty cycle corresponds to low power, because the power is off for most of the time. Duty cycle is expressed in percent, 100% being fully on.The main advantage of PWM is that power loss in the switching devices is very low. When a switch is off there is practically no current, and when it is on and power is being transferred to the load, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle.PWM has also been used in certain communication systems where its duty cycle has been used to convey information over a communications channel.