The control speed of brushless DC motor will typically use the following type of process control:
a. Modulating
b. Open Loop
c. On-off
d. Feedforward
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The control speed of brushless DC motor will typically use the following type of process control:...
Book name # fundamental of electric machines A brushless DC electric motor (BLDC motor or BL motor), also known as electronically commutated motor (ECM or EC motor) and synchronous DC motors, are synchronous motors powered by direct current (DC) electricity via an inverter or switching power supply which produces electricity in the form of alternating current (AC) to drive each phase of the motor via a closed loop controller. The controller provides pulses of current to the motor windings that...
A control system that anticipates load 7 Problem 1: Select the most correct answer disturbances and controls them before they can impact the process variable is of this type Open loop controllers have this characteristic: 1 They don't use feedback Open loop control system Feedback control system a b. They don't observe the output Can't compensate for disturbance All of the above b. Feedforward control system d. None of the above This is an example of an open-loop system 8....
The type of transistor configuration that’s used with a DC servo motor is the A. negative-logic configuration. B. totem pole configuration. C. H-bridge configuration. D. emitter-follower configuration. An inverter can be programmed to stop an AC motor quickly by enabling A. an internal brake. B. DC voltage injection to the motor. C. a stationary AC waveform. D. a reverse pulse action. You’re looking at a tachometer feedback signal on an oscilloscope. The waveform takes a long time to go to...
Problem 1: Speed versus time plot of a small DC motor is obtained when 1 Volt input is applied. The response curve is shown below: a) Approximate the open loop transfer 6 function, G(s) of the DC motor. b) A simple proportional controller (P- controller) is applied to the same DC motor. The control goal is to track a constant target speed ofr 150 rpm. Determine the control gain Kp which guarantees an offset error of e 5 rpm. (i.e.,...
A 12-pole, brushless, DC motor has a no-load speed of 5000rpm and a stall torque of 50 in-oz when operating at rated voltage of 60V. Testing shows that no-load speed and stall torque vary linearly with applied voltage. Also, with a constant applied voltage the speed decreases linearly as delivered torque increases. Calculate the following: Torque that the motor delivers at 2000 rpm when operated at rated voltage. T a) b) Fundamental frequency of the applied voltage waveform at this...
1. A typical motor speed control circuit that is controlled by an analog current loop will have a current of A. 2-20 mA B. 5-50 mA C. 0-10 mA D. 4-20 mA. 2. What is the purpose of thermostat number 2, IN7, in the mixing vat machine? A. This thermostat is used to prevent an over-temperature condition in the event thermostat one sticks open. B. This thermostat is used to shut off the heater when the chemical mix reaches setpoint...
A type of DC motor which has wide variance in speed based on the mechanical load. a. Series Motor. b. Parallel Motor c. Shunt Motor d. Compound Motor.
A 3 phase squirrel cage induction motor is connected to a variable speed drive. The motor should be rated for : A. dc duty B. Brushless operation C. Design E D. Inverter duty
answere Please mark only one of the four choices Q1. Controlling the speed of a DC motor by using a micro-controller, is what type of control? b. Digital C. Analog d. All of the above Q2. When current flow is interrupted in a DC motor, which motor property causes a reverse voltage spike? a. Resistance b. Capacitance C. Inductance d. None of the above Q3. Which Arduino internal circuit is used to control motor speed? a. Digital to Analog Converter...
7. Draw the equivalent circuit of the shunt type dc motor and obtain the speed torque characteristic equation. Also explain that the dc motor operates stably at all speeds.